Generac 20 kW G0055390 Manuel utilisateur
- Taper
- Manuel utilisateur
TECHNICAL
MANUAL
This manual should remain with the unit.
RTSS Load Shed Automatic Transfer Switch
The manufacturer cannot anticipate every possible circumstance
that might involve a hazard. The warnings in this manual, and on
tags and decals affixed to the unit are, therefore, not all-inclusive. If
using a procedure, work method or operating technique the manu-
facturer does not specifically recommend, ensure that it is safe for
others. Also make sure the procedure, work method or operating
technique chosen does not render the transfer switch unsafe.
Throughout this publication, and on tags and decals affixed to the
generator, DANGER, WARNING, CAUTION and NOTE blocks are
used to alert personnel to special instructions about a particular
operation that may be hazardous if performed incorrectly or care-
lessly. Observe them carefully. Their definitions are as follows:
DANGER
After this heading, read instructions that, if not
strictly complied with, will result in personal
injury, including without limitation, death, or
property damage.
After this heading, read instructions that, if not
strictly complied with, may result in personal
injury or property damage.
After this heading, read instructions that, if not
strictly complied with, could result in damage
to equipment and/or property.
NOTE:
After this heading, read explanatory statements that require
special emphasis.
These safety warnings cannot eliminate the hazards that they
indicate. Common sense and strict compliance with the special
instructions while performing the service are essential to prevent-
ing accidents.
Four commonly used safety symbols accompany the DANGER,
WARNING and CAUTION blocks. The type of information each
indicates follows:
This symbol points out important safety infor-
mation that, if not followed, could endanger
personal safety and/or property.
This symbol points out potential explosion
hazard.
This symbol points out potential fire hazard.
This symbol points out potential electrical
shock hazard.
GENERAL HAZARDS
Any AC generator that is used for backup power if a NORMAL •
(UTILITY) power source failure occurs, must be isolated from
the NORMAL (UTILITY) power source by means of an approved
transfer switch. Failure to properly isolate the NORMAL and
STANDBY power sources from each other may result in injury
or death to electric utility workers, due to backfeed of electrical
energy.
Improper or unauthorized installation, operation, service or •
repair of the equipment is extremely dangerous and may result
in death, serious personal injury, or damage to equipment and/
or personal property.
Extremely high and dangerous power voltages are present inside •
an installed transfer switch. Any contact with high voltage ter-
minals, contacts or wires will result in extremely hazardous,
and possibly LETHAL, electric shock. DO NOT WORK ON THE
TRANSFER SWITCH UNTIL ALL POWER VOLTAGE SUPPLIES
TO THE SWITCH HAVE BEEN POSITIVELY TURNED OFF.
Competent, qualified personnel should install, operate and ser-•
vice this equipment. Adhere strictly to local, state and national
electrical and building codes. When using this equipment,
comply with regulations the National Electrical Code (NEC),
CSA Standard; C22.1 Canadian Electric Code and Occupational
Safety and Health Administration (OSHA) have established.
IMPORTANT SAFETY INSTRUCTIONS
SAVE THESE INSTRUCTIONS - This manual contains important instructions that should be fol-
lowed during installation and maintenance of the generator and batteries.
SAVE THESE INSTRUCTIONS! Read the following information carefully before attempting to
install, operate or service this equipment. Also read the instructions and information on tags,
decals, and labels that may be affixed to the transfer switch. Replace any decal or label that is no
longer legible.
DANGER! Connection of a generator to an electrical system normally supplied by an electric
utility shall be by means of suitable transfer equipment so as to isolate the electric system
from utility distribution system when the generator is operating (Article 701 Legally Required
Standby Systems or Article 702 Optional Standby Systems, as applicable). Failure to isolate
electric system by these means may result in damage to generator and may result in injury or
death to utility workers due to backfeed of electrical energy.
Table of Contents
1
Safety Rules .................................................Inside Front Cover
Section 1 — General Information ............................................ 2
1.1 Introduction ................................................................................ 2
1.2 Equipment Description ................................................................ 2
1.2.1 Transfer Switch Mechanism .............................................. 2
1.2.2 Utility Service Disconnect Circuit Breaker .......................... 2
1.2.3 Load Shed Controller ........................................................ 3
1.2.4 Battery Charger ................................................................ 3
1.3 Transfer Switch Data Decal ......................................................... 3
1.4 Transfer Switch Enclosure ........................................................... 3
1.5 Safe Use Of Transfer Switch........................................................ 3
Section 2 — Installation .......................................................... 4
2.1 Introduction to Installation ........................................................... 4
2.2 Unpacking .................................................................................. 4
2.3 Mounting .................................................................................... 4
2.4 Connecting Power Source and Load Lines .................................. 4
2.5 Neutral Connections .................................................................... 5
2.6 Connecting Control Wires ........................................................... 5
Section 3 — Operation ............................................................ 5
3.1 Functional Tests & Adjustments .................................................. 5
3.2 Manual Operation ........................................................................ 5
3.2.1 ATS Manual Operation ...................................................... 5
3.2.2 LSS Manual Operation ...................................................... 5
3.2.3 Close to Utility Source Side ............................................... 6
3.2.4 Close to Generator Source Side ........................................ 6
3.2.5 Return to Utility Source Side .............................................6
3.3 Voltage Checks ...........................................................................6
3.4 Generator Tests Under Load ........................................................ 7
3.4.1 ATS & Critical Loads ......................................................... 7
3.4.2 Load Shed Functional Test ................................................ 8
Section 4 – Notes .................................................................... 9
Section 5 – Installation Diagrams ......................................... 11
Section 6 – Electrical Data ....................................................14
Section 7 – Exploded Views & Parts Lists ............................. 18
Section 8 – Warranty ............................................... Back Cover
Never handle any kind of electrical device while standing •
in water, while barefoot, or while hands or feet are wet.
DANGEROUS ELECTRICAL SHOCK MAY RESULT.
Jewelry conducts electricity and wearing it may cause dan-•
gerous electrical shock. Remove all jewelry (such as rings,
watches, bracelets, etc.) before working on this equipment.
If work must be done on this equipment while standing on metal •
or concrete, place insulative mats over a dry wood platform.
Work on this equipment only while standing on such insulative
mats.
Never work on this equipment while physically or mentally •
fatigued.
Keep the transfer switch enclosure door closed and bolted at all •
times. Only qualified personnel should be permitted access to
the switch interior.
In case of an accident caused by electric shock, immediately •
shut down the source of electrical power. If this is not possible,
attempt to free the victim from the live conductor but AVOID
DIRECT CONTACT WITH THE VICTIM. Use a nonconducting
implement, such as a dry rope or board, to free the victim from
the live conductor. If the victim is unconscious, apply first aid
and get immediate medical help.
When an automatic transfer switch is installed for a standby •
generator set, the generator engine may crank and start at
any time without warning. To avoid possible injury that might
be caused by such sudden start-ups, the system’s automatic
start circuit must be disabled before working on or around
the generator or transfer switch. For that purpose, a SAFETY
DISCONNECT is provided inside the transfer switch. Always
set that switch to its OFF position before working on the equip-
ment. Then place a “DO NOT OPERATE” tag on the transfer
switch and on the generator. Remove the Negative (Neg) or (–)
battery cable.
For authorized service, reference
the dealer locator number found
in the generator owner’s manual or
on the generator's data label.
2
Section 1 — General Information
RTSS Type Transfer Switch
1.1 INTRODUCTION
This manual has been prepared especially for the purpose of famil-
iarizing personnel with the design, application, installation, opera-
tion and servicing of the applicable equipment. Read the manual
carefully and comply with all instructions. This will help to prevent
accidents or damage to equipment that might otherwise be caused
by carelessness, incorrect application, or improper procedures.
Every effort has been expended to make sure that the contents
of this manual are both accurate and current. The manufacturer,
however, reserves the right to change, alter or otherwise improve
the product at any time without prior notice.
1.2 EQUIPMENT DESCRIPTION
The PowerManager™ LTS transfer switch will provide three major
functions.
The first function is to provide an automatic transfer switch.
The automatic transfer switch is used for transferring electrical
loads from a UTILITY (NORMAL) power source to a GENERATOR
(STANDBY) power source. Such a transfer of electrical loads
occurs automatically when (connected to a Generac engine gen-
erator) the UTILITY power source has failed or is at a substantially
reduced voltage and the GENERATOR source voltage and frequen-
cy have reached an acceptable level. The transfer switch prevents
electrical feedback between two different power sources (such as
the UTILITY and GENERATOR sources) and, for that reason, codes
require it in all standby electrical system installations.
The second function is to provide a means to divide up the electri-
cal loads on the electrical system. The electrical loads are to be
divided into “critical loads” and non-essential loads. The “critical”
loads are connected to the internal 16 circuit panel board. The
non-essential electrical loads are to be powered from the load shed
switch (LSS).
The UTILITY source will supply all electrical loads at all times.
When the transfer signal is given by the engine generator controller,
all loads, both critical and non-essential loads, are connected to
the GENERATOR supply. If the generator is overloaded the LSS will
operate and disconnect the non-essential loads which results in a
reduction in the load on the generator.
The third function is a 16 circuit load center to connect the “criti-
cal loads” to. These loads will be normally powered by the UTILITY
source and will be backed up by the GENERATOR source. The
Siemens load center is provided with the following Siemens type
QP circuit breakers; 1-50A 2-pole, 1-40A 2-pole, 1-20A 2-pole,
5-20A single pole and 5-15A 2-pole circuit breakers.
The PowerManager LTS transfer switch is suitable for use as
SERVICE ENTRANCE EQUIPMENT – UTILITY (NORMAL) source
only. The PowerManager LTS is only SERVICE ENTRANCE rated for
the USA. The 200A 2-pole circuit breaker provided is the “service
disconnect” and is labeled as such. An additional disconnect must
be readily available for the alternate source, unless the alternate
source is an accessible generator and can be shutdown.
1.2.1 TRANSFER SWITCH MECHANISM
These switches (Figure 1.1) are used with a single-phase system,
when the single-phase NEUTRAL line is to be connected to a
Neutral Lug and is not to be switched.
Solderless, screw-type terminal lugs are standard.
Switch
Rating
Wire
Range
Conductor Tightening
Torque
200A #6-250 MCM 275 in-lbs.
This transfer switch is suitable for control of motors, electric dis-
charge lamps, tungsten filament and electric heating equipment
where the sum of motor full load ampere ratings and the ampere
ratings of other loads do not exceed the ampere rating of the
switch and the tungsten load does not exceed 30 percent of the
switch rating.
Figure 1.1 — Typical ATS Transfer Mechanism
UTILITY
CLOSING
COIL
GENERATOR
CLOSING
COIL
UTILITY LUGS
GENERATOR
LUGS (E1 & E2)
LOAD LUGS (T1 & T2)
This transfer switch is for use in optional standby systems only
(NEC
®
Article 702).
This transfer switch is suitable for use on a circuit capable of
22,000 rms symmetrical amperes, 240 VAC maximum.
1.2.2 UTILITY SERVICE DISCONNECT CIRCUIT
BREAKER
The utility service disconnect circuit breaker for the 200 amp
models are:
Generac, Type 225AF, 2-pole•
120/240VAC, 200A•
50/60 Hertz•
Wire range: 300 MCM - 6 STR (Line), 250 MCM - 6 STR •
(Load)
The conductor tightening torque is 375 in-lbs. (Line), 275 in-•
lbs. (Non-essential Load and Generator Terminals)
3
1.2.3 LOAD SHED CONTROLLER
The primary function of the Load Shed Controller (LSC) is to deter-
mine when there is excess load on the generator and has the ability
to disconnect the non-essential loads connected to it. Excess load
is determined by monitoring the generator supply frequency, if the
frequency drops below 58 Hz for more than three (3) seconds,
or below 50 Hz for 1/2 second, and the generator is considered
to have excess load on it. When this happens, non-essential
customer loads are disconnected. The non-essential loads are
supplied via the load shed switch (LSS) and the LSS is actuated to
disconnect these loads.
The non-essential loads are reconnected in one of 3 ways; Utility
voltage is restored and ATS transfers all load back to the Utility
supply, manual operation of LOAD SHED RESET push-button on
the outside of the enclosure or, automatic operation setup on the
DIP switches on the LSC.
For manual operation, set DIP switch #6 to the ON position. If
the generator output is overloaded and the non-essential loads
are disconnected, press the LOAD SHED RESET push-button to
reconnect the non-essential loads to the generator. If the overload
condition still exists the LSC will turn the non-essential loads off.
For automatic operation, the number of attempts to reconnect the
non-essential loads can be selected. The 2 choices are one-shot
or repeated. The time interval before each attempt is set on DIP
switches 1-4. For “one-shot” operation mode set DIP switch #5 to
ON. Reconnection of the non-essential loads will occur one time,
after the time set on DIP switches 1-4. If DIP switch #5 is OFF,
the LSC will attempt to reconnect the non-essential loads after the
time interval set on DIP switches 1-4. If the overload still exists or
comes back, the LSC and LSS will disconnect non-essential loads
and the timer and the attempt to reconnect non-essential loads
will be repeated.
DIP switch num-
ber
Function
1 Selects a 5 minute reconnection time
2 Selects a 15 minute reconnection time
3 Selects a 30 minute reconnection time
4 Selects a 60 minute reconnection time
1-4 all OFF Selects a 1 minute reconnection time
5 Selects one-shot mode
6 Selects manual reconnect only
7 Selects 50 Hz units
8 Not used
1.2.4 BATTERY CHARGER
The POWER MANAGER LTS transfer switch is provided with a bat-
tery charger (item #44 on Generac #0G8054 assembly drawing)
for charging of the engine generator 12 Vdc battery. The battery
charger is powered from the load side of the transfer switch (line
to neutral – 120V) and is protected by a 2A fuse on the LSC pcb.
The battery charger will charge the battery at all times.
1.3 TRANSFER SWITCH DATA
DECAL
A DATA DECAL is permanently affixed to the transfer switch enclo-
sure. Use this transfer switch only with the specific limits shown
on the DATA DECAL and on other decals and labels that may be
affixed to the switch. This will prevent damage to equipment and
property.
When requesting information or ordering parts for this equipment,
make sure to include all information from the DATA DECAL.
Record the Model and Serial numbers in the space provided below
for future reference.
MODEL #
SERIAL #
1.4 TRANSFER SWITCH
ENCLOSURE
The standard switch enclosure is a National Electrical Manufacturer’s
Association (NEMA) 3R, UL listed. NEMA 3R type enclosures pri-
marily provide a degree of protection against falling rain and sleet
and is undamaged by the formation of ice on the enclosure.
1.5 SAFE USE OF TRANSFER
SWITCH
Before installing, operating or servicing this equipment, read the
SAFETY RULES (inside front cover) carefully. Comply strictly
with all SAFETY RULES to prevent accidents and/or damage to
the equipment. The manufacturer recommends that a copy of the
SAFETY RULES are posted near the transfer switch. Also, be sure
to read all instructions and information found on tags, labels and
decals affixed to the equipment.
Three publications that outline the safe use of transfer switches
are the following:
NFPA 70; National Electrical Code•
NFPA 70E; Standard for Electrical Safety in the Workplace•
UL 1008, STANDARD FOR SAFETY-AUTOMATIC TRANSFER •
SWITCHES
NOTE:
It is essential to use the latest version of any standard to ensure
correct and current information.
Section 1 — General Information
RTSS Type Transfer Switch
4
Section 2 — Installation
RTSS Type Transfer Switch
2.1 INTRODUCTION TO
INSTALLATION
This equipment has been wired and tested at the factory. Installing
the switch includes the following procedures:
Mounting the enclosure.•
Connecting power source and load leads.•
Connecting non-essential loads.•
Connecting "Critical Load" branch circuits to the internal load •
center.
Connecting the utility sensing and transfer relay circuits to the •
generator control panel.
Connecting any auxiliary contact (if needed)•
Testing functions.•
2.2 UNPACKING
Carefully unpack the transfer switch. Inspect closely for any dam-
age that might have occurred during shipment. The purchaser
must file with the carrier any claims for loss or damage incurred
while in transit.
Check that all packing material is completely removed from the
switch prior to installation.
2.3 MOUNTING
Mounting dimensions for the transfer switch enclosure are in this
manual. Enclosures are typically wall-mounted. See “Installation
Diagram”.
Handle transfer switches carefully when
installing. Do not drop the switch. Protect
the switch against impact at all times, and
against construction grit and metal chips.
Never install a transfer switch that has been
damaged.
This transfer switch is mounted in a NEMA 3R aluminum enclo-
sure. It can be mounted outside or inside and should be based on
the layout of installation, convenience and proximity to the utility
supply and load center.
Install the transfer switch as close as possible to the electrical
loads that are to be connected to it. Mount the switch vertically to
a rigid supporting structure. To prevent switch distortion, level all
mounting points. If necessary, use washers behind mounting holes
to level the unit.
2.4 CONNECTING POWER SOURCE
AND LOAD LINES
DANGER
Make sure to turn OFF both the UTILITY
(NORMAL) and GENERATOR (STANDBY)
power supplies before trying to connect
power source and load lines to the transfer
switch. Supply voltages are extremely high
and dangerous. Contact with such high volt-
age power supply lines causes extremely haz-
ardous, possibly lethal, electrical shock.
Wiring diagrams and electrical schematics are provided in this
manual.
NOTE:
All installations must comply with national, state and local
codes. It is the responsibility of the installer to perform an
installation that will pass the final electrical inspection.
Conductor sizes must be adequate to handle the maximum cur-
rent to which they will be subjected, based on the 75°C column of
tables, charts, etc. used to size conductors. The installation must
comply fully with all applicable codes, standards and regulations.
Before connecting wiring cables to terminals, remove any surface
oxides from the cable ends with a wire brush. All power cables
must enter the enclosure through the knockouts provided. This
is necessary to maintain the NEMA/UL type 3 rating. If mounted
indoors, conduits can enter the enclosure above the knockouts. If
not using the knockouts, entry must be at or below knockouts.
If ALUMINUM conductors are used, apply corrosion inhibitor to
conductors. Tighten terminal lugs to the torque values as noted on
the "Utility Service Disconnect Circuit Breaker", and on the decal
located on the inside of the door. After tightening terminal lugs,
carefully wipe away any excess corrosion inhibitor.
Use a torque wrench to tighten the conduc-
tors, being sure not to overtighten, or dam-
age to the insulating base could occur. If not
tightened enough, a loose connection would
result, causing excess heat which could dam-
age the switch base.
Connect power source load conductors to clearly marked transfer
mechanism terminal lugs as follows
1. Connect UTILITY (NORMAL) power source cables to the top
of the UTILITY SERVICE DISCONNECT circuit breaker.
2. Connect GENERATOR (STANDBY) source power cables to
ATS GENERATOR supply terminals, E1-E2.
3. Connect non-essential customer LOAD leads to LSS switch
terminals E1, E2.
4. Connect critical customer loads to the circuit breakers on the
load center provided.
5
Conductors must be properly supported, of approved insulative
qualities, protected by approved conduit, and of the correct wire
gauge size in accordance with applicable codes.
Be sure to maintain proper electrical clearance between live metal
parts and grounded metal. Allow at least 1/2 inch for 100-400
amp circuits.
2.5 NEUTRAL CONNECTIONS
The main neutral block is provided for the connection of the
neutral (ungrounded conductors) of the Utility, Generator and non-
essential load neutrals. Tighten all wires to the specified torque.
Torque values are given on the information decal located on the
inside cover.
The main neutral block is connected (bonded) to the enclosure
metal by a busbar. If bonding of the neutral is not necessary, the
jumper can be removed. When the jumper bar is removed the
control wires should be connected as follows:
#00 wire to the neutral block.•
GRD wire to the enclosure.•
The essential load neutrals are to be connected on the busbars
mounted on the load center, next to the branch circuit breakers.
2.6 CONNECTING CONTROL
WIRES
Control system interconnections consist of N1 and N2, and leads
0, 15B and 23. Control system interconnection leads can be run in
the same conduit as the AC power lead if the conduit length is less
than 35 feet, and ALL of the wiring is rated for 600V. If the conduit
length between the generator and PowerManager LTS is more than
35 feet, the control and power leads must be routed in separate
conduits. Recommended wire gauge sizes for this wiring depends
on the length of the wire, as recommended in the following chart:
MAXIMUM WIRE
RUN LENGTH
RECOMMENDED WIRE
SIZE
35 feet (10.67m) No. 16 AWG.
60 feet (18.29m) No. 14 AWG.
90 feet (27.43m) No. 12 AWG.
3.1 FUNCTIONAL TESTS AND
ADJUSTMENTS
Following transfer switch installation and interconnection,
inspect the entire installation carefully. A competent, qualified
electrician should inspect it. The installation should comply
strictly with all applicable codes, standards, and regulations.
When absolutely certain the installation is proper and correct,
complete a functional test of the system.
Perform functional tests in the exact order
presented in this manual, or damage could be
done to the switch.
IMPORTANT: Before proceeding with functional tests, read and
make sure all instructions and information in this section are
understood. Also read the information and instructions of labels
and decals affixed to the switch. Note any options or accessories
that might be installed and review their operation.
3.2 MANUAL OPERATION
DANGER
Do NOT manually transfer under load.
Disconnect transfer switch from all power
sources by approved means, such as the
main circuit breaker(s).
3.2.1 ATS MANUAL OPERATION
A manual HANDLE is shipped with the transfer switch. Manual
operation must be checked BEFORE the transfer switch is oper-
ated electrically. To check manual operation, proceed as follows
(Figure 3.1):
1. Turn the generator’s AUTO/OFF/MANUAL switch to OFF.
2. Turn OFF UTILITY SERVICE DISCONNECT circuit breaker.
3. Note position of transfer mechanism main contacts by
observing the moveable contact carrier arm. This can be
viewed through the long narrow slot in the inside cover of the
ATS. The top of the moveable contact carrier arm is yellow to
be easily identified.
Manual operation handle in the UP position - LOAD terminals •
(T1, T2) are connected to UTILITY terminals (N1, N2).
Manual operation handle in the DOWN position - LOAD termi-•
nals (T1, T2) are connected to EMERGENCY terminals (E1,
E2).
3.2.2 LSS MANUAL OPERATION
A manual HANDLE is shipped with the transfer switch. Manual
operation must be checked BEFORE the LSS is operated electrical-
ly. To check manual operation, proceed as follows (Figure 3.2):
1. Turn the generator’s AUTO/OFF/MANUAL switch to OFF.
2. Turn OFF UTILITY SERVICE DISCONNECT circuit breaker.
3. Note position of non-essential LSS main contacts by observ-
ing the moveable contact carrier arm. This can be viewed
through the long narrow slot in the inside cover of the ATS.
The top of the moveable contact carrier arm is yellow to be
easily identified.
Manual operation handle in the UP position - non-essential •
loads OFF.
Manual operation handle in the DOWN position - non-essen-•
tial loads ON.
Section 3 — Operation
RTSS Type Transfer Switch
6
Do not use excessive force when operating
the transfer switch manually or damage could
be done to the manual handle.
3.2.3 CLOSE TO UTILITY SOURCE SIDE
Before proceeding, verify the position of the switch by observing
the position of manual operation handle in Figure 3.1. If the handle
is UP, the contacts are closed in the UTILITY (NORMAL) position,
no further action is required. If the handle is DOWN, proceed with
Step 1.
Step 1: With the handle inserted into the moveable contact carrier
arm, move handle UP. Be sure to hold on to the handle as
it will move quickly after the center of travel.
Step 2: Remove manual operating handle from moveable contact
carrier arm. Return handle to storage bracket.
3.2.4 CLOSE TO GENERATOR SOURCE SIDE
Before proceeding, verify the position of the switch by observ-
ing the position of the manual operation handle in Figure 3.1. If
the handle is DOWN, the contacts are closed in the GENERATOR
(STANDBY) position. No further action is required. If the handle is
UP, proceed with Step 1.
Step 1: With the handle inserted into the moveable contact carrier
arm, move the handle DOWN. Be sure to hold on to the
handle as it will move quickly after the center of travel.
Step 2: Remove manual operating handle from moveable contact
carrier arm. Return handle to storage bracket.
3.2.5 RETURN TO UTILITY SOURCE SIDE
Step 1: Manually actuate switch to return manual operating handle
to the UP position.
Step 2: Remove manual operating handle from moveable contact
carrier arm. Return handle to storage bracket.
3.3 VOLTAGE CHECKS
1. Turn ON the UTILITY power supply to the PowerManager LTS
using the UTILITY SERVICE DISCONNECT circuit breaker.
DANGER
PROCEED WITH CAUTION. THE TRANSFER
SWITCH IS NOW ELECTRICALLY HOT.
CONTACT WITH LIVE TERMINALS RESULTS
IN EXTREMELY HAZARDOUS AND POSSIBLY
FATAL ELECTRICAL SHOCK.
2. With an accurate AC voltmeter, check for correct voltage.
Measure across ATS terminal lugs N1 and N2. Also check N1
to NEUTRAL and N2 to NEUTRAL.
3. When certain that UTILITY supply voltage is correct and compat-
ible with transfer switch ratings, turn OFF the UTILITY supply to
the transfer switch.
4. On the generator panel, set the AUTO/OFF/ MANUAL switch to
MANUAL position. The generator should crank and start.
Section 3 — Operation
RTSS Type Transfer Switch
Move handle UP for the
UTILITY (NORMAL) position.
Move handle DOWN for the
GENERATOR (STANDBY) position.
Attach handle to the moveable
contact carrier arm.
NOTE: Return handle to storage position in enclosure when finished with manual transfer.
Figure 3.1 — Actuating ATS Transfer Switch
7
The voltage measurements should be as follows:
N1 - N2 240 VAC Nominal
N1 - Neutral 120 VAC Nominal
N2 - Neutral 120 VAC Nominal
5. Let the generator stabilize and warm up at no-load for at least
five minutes.
6. Set the generator's main circuit breaker (CB1) to its ON or
CLOSED position.
DANGER
PROCEED WITH CAUTION. GENERATOR
OUTPUT VOLTAGE IS NOW BEING DELIVERED
TO TRANSFER SWITCH TERMINALS.
CONTACT WITH LIVE TERMINALS RESULTS
IN EXTREMELY DANGEROUS AND POSSIBLY
FATAL ELECTRICAL SHOCK.
7. With an accurate AC voltmeter and frequency meter, check the
no-load, voltage and frequency.
Measure across ATS terminal lugs E1 to E2. Also check E1 to
NEUTRAL and E2 to NEUTRAL.
a. Frequency ....................................................60-62 Hertz
b. Terminals E1 to E2 .......................................240-246 VAC
c. Terminals E1 to NEUTRAL ............................120-123 VAC
d. Terminals E2 to NEUTRAL ............................120-123 VAC
8. Set the generator’s main circuit breaker (CB1) to its OFF or
OPEN position.
9. Set the AUTO/OFF/MANUAL switch to the OFF position to shut
down the generator.
NOTE:
Do NOT proceed until generator AC output voltage and fre-
quency are correct and within stated limits. If the no-load volt-
age is correct but no-load frequency is incorrect, the engine
governed speed may require adjustment. If no-load frequency
is correct but voltage is not, the voltage regulator may require
adjustment.
3.4 GENERATOR TESTS UNDER
LOAD
3.4.1 ATS & CRITICAL LOADS
1. Set the generator's main circuit breaker to its OFF or OPEN
position.
2. Set the UTILITY SERVICE DISCONNECT circuit breaker to the
OFF position.
3. Manually actuate the transfer switch main contacts to
their GENERATOR (STANDBY) position. Refer to "Manual
Operation".
4. Manually actuate the LSS main contacts to the UP position.
Non-essential loads OFF.
5. To start the generator, set the AUTO/OFF/ MANUAL switch to
MANUAL. When engine starts, let it stabilize for a few min-
utes.
Section 3 — Operation
RTSS Type Transfer Switch
Move handle UP for the
non-essential loads OFF.
Move handle DOWN for the
non-essential loads ON.
Attach handle to the moveable
contact carrier arm.
NOTE: Return handle to storage position in enclosure when finished with manual transfer.
Figure 3.2 — Actuating LSS Transfer Switch
8
6. Turn the generator's main circuit breaker to its ON or CLOSED
position. The generator now powers all LOAD circuits. Check
generator operation under load as follows:
Turn ON electrical loads to the full rated wattage/amperage •
capacity of the generator. DO NOT OVERLOAD.
With maximum rated load applied, check voltage and fre-•
quency across transfer switch terminals E1 and E2. Voltage
should be greater than 230VAC and frequency should be
greater than 59 Hertz.
Let the generator run under rated load for at least 30 minutes. •
With unit running, listen for unusual noises, vibration, over-
heating, etc., that might indicate a problem.
7. When checkout under load is complete, set main circuit
breaker of the generator to its OFF or OPEN position.
8. Let the generator run at no-load for several minutes. Then,
shut down by setting the AUTO/OFF/MANUAL switch to its
OFF position.
9. Move the switch's main contacts back to their UTILITY posi-
tion. For example, LOAD connected to UTILITY power supply.
Refer to "Manual Operation". Handle and operating lever of
transfer switch should be in UP position.
10. Turn on the UTILITY power supply to transfer switch, using
the UTILITY SERVICE DISCONNECT circuit breaker. The utility
power source now powers the loads.
11. Set the generator's AUTO/OFF/MANUAL switch to its AUTO
position.
3.4.2 LOAD SHED FUNCTIONAL TEST
1. Set the generator’s main circuit breaker to its OFF or OPEN
position.
2. Set the UTILITY SERVICE DISCONNECT circuit breaker to the
OFF position.
3. Manually actuate the transfer switch main contacts to the
GENERATOR position. Refer to “Manual Operation” section of
this manual.
4. Manually actuate the LSS main contacts to the DOWN posi-
tion. Non-essential loads ON.
5. To start the generator, set the AUTO/OFF/MANUAL switch to
MANUAL. When engine starts, let it stabilize for a few min-
utes.
6. Turn the generator’s main circuit breaker its ON position. The
generator now powers all LOAD circuits. Check generator
operation under load as follows:
Turn ON electrical loads to the full rated wattage/amperage •
capacity of the generator.
Increase the load to slightly overload the generator (load to •
draw frequency down 55-56 hz). This will require turning
loads on that are connected to the LSS. Do not severely
overload the generator.
The LSS should actuate after three (3) seconds to disconnect •
the non-essential loads. The door mounted LOAD SHED LED
should be ON.
Decrease the electrical load on the generator to allow the •
generator frequency to increase to 60 Hz.
7. The next step will depend on how the LSC is set up (see the
"Load Shed Controller" section). If set up for:
Manual Operation• — Press the door mounted LOAD SHED
RESET button. The LSS will reconnect non-essential loads.
Automatic Operation• — The LSS will reconnect non-essen-
tial loads after the delay time setup on the DIP switches of
the LSC.
8. Turn ON the UTILITY power supply to the transfer switch using
the UTILITY SERVICE DISCONNECT circuit breaker. After the
return to utility time delay, the utility power source will power
the loads.
9. Set the generator's AUTO/OFF/MANUAL switch to the AUTO
position.
Section 3 — Operation
RTSS Type Transfer Switch
9
Section 4 — Notes
10
Section 4 — Notes
11
Section 5 — Installation Diagrams
RTSS Type Transfer Switch
200 Amp Load Shed Enclosure - Drawing No. 0G8775-B
12
Section 5 — Installation Diagrams
RTSS Type Transfer Switch
Load Shed Interconnection - Drawing No. 0G8774-C
13
Section 5 — Installation Diagrams
RTSS Type Transfer Switch
Load Shed Interconnection - Drawing No. 0G8774-C
14
Section 6 — Electrical Data
RTSS Type Transfer Switch
Electrical Schematic - Drawing No. 0G7816-B
15
Section 6 — Electrical Data
RTSS Type Transfer Switch
Electrical Schematic - Drawing No. 0G7816-B
16
Section 6 — Electrical Data
RTSS Type Transfer Switch
Wiring Diagram - Drawing No. 0G7817-C
17
Section 6 — Electrical Data
RTSS Type Transfer Switch
Wiring Diagram - Drawing No. 0G7817-C
18
Section 7 — Exploded Views & Parts Lists
RTSS Type Transfer Switch
Load Shed Transfer Switch - Drawing No. 0G8054$-G
Parts List on page 21.
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Generac 20 kW G0055390 Manuel utilisateur
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- English: Generac 20 kW G0055390 User manual