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Cummins onan wbtpcc power generation transfer switch 150 1000 amperes service repair manual
1. Service Manual
Transfer Switch
WBTPCB (Spec A)
WBTPCC (Spec A)
WBTPCD (Spec A)
150−1000 Amperes
English − Original Instructions 3-2010 A030H993 (Issue 1)
10. ix
Safety Precautions
This manual includes the following symbols to indi-
cate potentially dangerous conditions. Read the
manual carefully and know when these conditions
exist. Then take the necessary steps to protect per-
sonnel and the equipment.
DANGER This symbol warns of immediate
hazards that will result in severe personal inju-
ry or death.
WARNING This symbol refers to a hazard or
unsafe practice that can result in severe per-
sonal injury or death.
CAUTION This symbol refers to a hazard or
unsafe practice that can result in personal inju-
ry or product or property damage.
ELECTRICAL SHOCK CAN CAUSE
SEVERE PERSONAL INJURY OR DEATH
High voltage in transfer switch components pres-
ents serious shock hazards that can result in se-
vere personal injury or death. Read and follow
these suggestions.
Keep the transfer switch cabinet closed and
locked. Make sure only authorized personnel have
the cabinet and operational keys.
Due to the serious shock hazard from high voltages
within the cabinet, all service and adjustments to
the transfer switch must be performed only by an
electrician or authorized service representative.
Whenever the bypass switch is in the Emergency
position, an auxiliary switch closes a set of normally
open contacts to provide a constant generator set
start/run signal. The transfer switch, the emer-
gency bus, and the load bus are energized by
the output of the generator set and present a
serious shock hazard whenever the bypass
switch is in the Emergency position.
UTILITY-TO-GENSET OR GENSET-TO-
GENSET APPLICATIONS
If the cabinet must be opened for any reason:
1. Move the operation selector switch on the gen-
erator set to Stop.
2. Disconnect the starting batteries of the gener-
ator set or sets (remove the ground [−] lead
first).
3. Remove AC power to the automatic transfer
switch. If the instructions require otherwise,
use extreme caution due to the danger of
shock hazard.
UTILITY-TO-UTILITY APPLICATIONS
If the cabinet must be opened for any reason, re-
move AC power to the automatic transfer switch. If
the instructions require otherwise, use extreme
caution due to the danger of shock hazard.
GENERAL PRECAUTIONS
Place rubber insulative mats on dry wood platforms
over metal or concrete floors when working on any
electrical equipment. Do not wear damp clothing
(particularly wet shoes) or allow skin surfaces to be
damp when handling any electrical equipment.
Jewelry is a good conductor of electricity and
should be removed when working on the electrical
equipment.
Wear safety glasses whenever servicing the trans-
fer switch and and do not smoke near the batteries.
Do not work on this equipment when mentally or
physically fatigued, or after consuming alcohol or
any drug that makes the operation of equipment
unsafe.
WARNING
INCORRECT SERVICE OR REPLACEMENT OF PARTS CAN RESULT IN DEATH, SEVERE
PERSONAL INJURY, AND/OR EQUIPMENT DAMAGE. SERVICE PERSONNEL MUST BE
TRAINED AND EXPERIENCED TO PERFORM ELECTRICAL AND/OR MECHANICAL SER-
VICE.
WBTPC-2
11. 1-1
1. Introduction
ABOUT THIS MANUAL
This manual contains service procedures for By-
pass Transfer Switch PowerCommandR (WBTPC)
automatic transfer switches (ATS) rated at
150−1000 amperes and 300−600 amperes. This
manual provides information on the following
transfer switch models.
WBTPC transfer switches are open transition
transfer switches. With an open transition switch
there is never a time when both sources are sup-
plying power to the load. WBTPC transfer switches
are capable of executing Open Transition with
Sync Check, Programmed Transition, and Closed
Transition transfer modes.
An Open Transition with Sync Check Transfer
Mode executes an open transition when both
sources of power are within specified tolerances of
frequency, voltage, and relative phase difference.
If both sources meet the tolerances, a fast transfer
occurs.
A Programmed Transition Transfer Mode exe-
cutes an open transition by disconnecting the load
from the source of power, pausing in the neutral
position of the transfer switch (between switched
positions) to allow transient currents from the load
to diminish, and then the load is switched to the
other source.
A Closed Transition Transfer Mode executes a
load transfer by momentarily paralleling both
sources (a maximum of 100ms) before switching
sources.
Refer to the schematic and wiring diagram pack-
age that was shipped with the ATS for specific in-
formation about its configuration.
Use normal and necessary safety precautions be-
fore starting any service procedure. Identify all
hazards by referring to the Safety Precautions and
observe all warnings and cautions within the
manual. Whenever you are troubleshooting, re-
member that the generator set, ATS, and utility
power source are all interdependent.
TRANSFER SWITCH APPLICATION
The WBTPC transfer switch combines an auto-
matic transfer switch, a manual bypass switch and
a drawout isolation mechanism in one unit.
Transfer switches are an essential part of a build-
ing’s standby or emergency power system. Power
Source 1 (Normal), commonly the utility line, is
backed up by Power Source 2 (Emergency), often
a generator set. The transfer switch automatically
switches the electrical load from one source to the
other.
The load is connected to the common of the ATS
(Figure 1-1). Under normal conditions, the load is
supplied with power from Source 1 (illustrated as
Normal). If Source 1 is interrupted, the load is
transferred to Source 2 (Emergency). When
Source 1 returns, the load is retransferred to
Source 1. The transfer and retransfer of the load
are the two most basic functions of the ATS.
SOURCE 1
(NORMAL)
SOURCE 2
(EMERGENCY)
LOAD
ISOLATING
CONTACTS
AUTOMATIC
TRANSFER
SWITCH
ES1968
BYPASS
TRANSFER
SWITCH
FIGURE 1-1. WBTPC TRANSFER SWITCH
(TYPICAL FUNCTION)
Automatic transfer switches, capable of automatic
operation without operator intervention, perform
the basic function of transferring the load to the
available source. The controller monitors each
source for allowable voltage and frequency range.
PowerCommand is a registered trademark of Onan Corporation.
Onan and Cummins are registered trademarks of Cummins Inc.
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13. 1-2
Bypass Switch Function
The bypass switch allows the operator to manually
connect the load to the available power source, by-
passing the automatic transfer switch (Figure 1-1).
When bypassed, the automatic transfer switch can
be isolated for service or removal without causing
a power interruption.
Drawout Isolation Mechanism
The drawout isolation mechanism allows the auto-
matic transfer switch to be withdrawn for testing or
service. The transfer switch is mounted on rails
and is connected to the load, power sources, and
controls through isolation contacts. Turning a
drawout cranking handle moves the automatic
transfer switch along the rails and engages and
disengages the isolation contacts to permit testing
or service. If necessary, the switch can be lifted
from its rails and removed for service.
UTILITY-TO-GENSET OPERATION
In utility-to-genset applications, the transfer switch
performs the following functions:
1. Senses the interruption of the Source 1 pow-
er.
2. Sends a start signal to the generator set
(Source 2).
3. Waits for the voltage to stabilize and then
transfers the load to the Source 2.
4. Senses the return of Source1.
5. Retransfers the load to Source 1.
6. Sends a stop signal to the generator set.
UTILITY-TO-UTILITY OPERATION
In utility-to-utility applications, the transfer switch
performs the following functions:
1. Senses the interruption of the Source 1 pow-
er.
2. Transfers the load to the Source 2.
3. Senses the return of Source 1.
4. Retransfers the load to Source 1.
The controller can control a two-utility configura-
tion for prime power. One utility is designated the
preferred source. The control automatically trans-
fers the load between the two utilities and detects
alarm conditions. The exercise routine is not avail-
able in this configuration.
The operator can select either source as the pre-
ferred source (see Figure 1-2). The Preferred
Source menu is included in the Test submenus
(see Figure 4-13). The PC service tool can also be
used to designate either source as the preferred
source.
Y Preferred Source
Source 1/Source 2 "
FIGURE 1-2. PREFERRED SOURCE SUBMENU
REMOVING AND REPLACING
ELECTRONIC CONTROL COMPONENTS
WARNING AC power within the cabinet and
the rear side of the cabinet door presents a
shock hazard that can cause severe personal
injury or death. Disconnect connector J10/P10
before working on the electronic control sys-
tem.
Disconnecting J10/P10 removes all power to the
door.
Be sure to remove all power before replacing elec-
tronic control modules and components. This in-
cludes removing one of the lithium batteries from
the Digital Module. Reinstall the lithium battery af-
ter performing service parts replacement.
No special tools are required to remove and re-
place control system components. Be sure to use
all of the hardware when remounting components.
Refer to “Power Module Test” on page 6-2 for spe-
cial instructions when replacing the power mod-
ules. If possible, use the InPowert service tool to
create a capture file of the calibration and adjust-
ment settings in the Digital Module. Use the cap-
ture file to write these settings to a replacement
Digital Module.
InPower is a trademark of Onan Corporation.
14. 1-3
MODEL IDENTIFICATION
Identify your model by referring to the Model and
Specification number as shown on the nameplate.
Electrical characteristics and application informa-
tion are shown on the lower portion of the name-
plate. The nameplate is located on the cabinet
door.
If it’s necessary to contact a dealer or distributor re-
garding the transfer switch, always give the com-
plete Model, Specification, and Serial number as
listed on the nameplate. This information is neces-
sary to properly identify your unit among the many
types manufactured.
Feature/option codes are listed on the follow-
ing page.
The model number is made up of code segments
that designate various features or options:
W _ PC _ _ _ _ _
| | | | | | | |
1 2 3 4 5 6 7 8
1. Schnider Wingoal (Tian Jing) electric equip-
ment co, LTD
2. Switch type
OT − Open transition
BT − Bypass
3. PC − PC (Type)
4. Amperage (A) : 40, 70, 125, 150, 225, 260,
300, 400, 600, 800, 1000, 1200, 1600, 2000,
3000, 4000
5. Poles − 3, 4
6. Transfer type:
S − Sync check
D − Delay
7. Controller type:
1 − Level 1 control
2 − Level 2 control
8. Feature
HOW TO OBTAIN SERVICE
When the transfer switch requires servicing, con-
tact Schneider Electric at +8622 8371 2900
Ext − 875. Factory−trained Parts and Service rep-
resentatives are ready to handle all your service
needs.
When contacting Schneider Electric, always sup-
ply the complete Model, Specification and Serial
Number as shown on the nameplate.
15. 1-4
FEATURE DESCRIPTION
FEATURE
OPTION
Poles:
3 Poles
4 Poles
A028
A029
Application:
Utility to Genset
Utility to Utility
A035
A036
Agency Approvals:
IEC Listing
IEC/NFPA Listing
A046
A064
Frequency:
60 Hertz
50 Hertz
A044
A045
Voltage:
190 VAC
208 VAC
220 VAC
240 VAC
380 VAC
416 VAC
440 VAC
480 VAC
600 VAC
R038
R021
R022
R023
R024
R025
R035
R026
R027
Controls:
Level 2 Switch Control C024
Transfer Mode:
Open Transition
Programmed Transition
Closed Transition
A077
A078
A079
Control Options:
Front Panel Security Key
Digital Display
LONWORKS Network Communications
Module
Load Monitoring
Relay Module
Relay−Protective, 62PL Timer, 86 Lock
Out
Relay−Protective, 62PL Timer, 86 Lock
Out, 32R Single Phase Sense
Relay−Protective, 62PL Timer, 86 Lock
Out, 32R 3 Phase Sense
M017
M018
M020
M022
M023
M045−7
M046−7
M047−7
FEATURE DESCRIPTION
FEATURE
OPTION
Phase:
1 Phase, 2-W or 3-W
3 Phase, 3-W or 4-W
A041
A042
Meters:
Digital Bar Graph Meters D009
Auxiliary Relays:
24 VDC Coil
Emergency Position
Normal Position
Generator Start
12 VDC Coil
Emergency Position
Normal Position
Generator Start
L101
L102
L103
L104
L201
L202
L203
L204
Miscellaneous:
Terminal Block − 30 Position
Load Shed − From Emergency
Bus Stubs Connection (Open
Construction)
4 Ft. Harness Extension (Open
Construction)
M003
M007
N009
N013
Cabinet:
Type 30 − General use, Indoor
Type 34 − Outdoor use
Type 65 − Indoor or Outdoor use
Open Construction − No Enclosure
Type 61 − Indoor, dust-tight and
drip-tight
Type 65 − Indoor or Outdoor use
B001
B002
B003
B004
B010
B025
16. 2-1
2. Description
This section describes the standard and optional
control features as well as the control cabinet and
bypass transfer switch.
CABINET
The standard cabinet meets the requirements of
IEC for a IP Type 30 cabinet. Cabinets are avail-
able in IP types 30, 34, 65 and 61. The various
types are designated as general-purpose, indoor
or outdoor cabinets. Two examples of cabinets,
showing interior components are shown in Figures
2-6 and 2-7.
CONTROL PANEL
The panel features are divided into three groups:
Bar Graph Meters, Switch Panel and Digital Dis-
play (see Figure 2-1). Bar Graph Meters are op-
tional equipment.
KEY SWITCH
(OPTIONAL)
POWERCOMMAND
BAR GRAPH
METER PANEL
(OPTIONAL)
SWITCH PANEL
DIGITAL DISPLAY
FIGURE 2-1. PORTION OF CABINET WITH OPTIONS
17. 2-2
BAR GRAPH METER PANEL
The Bar Graph Meter Panel (optional) includes a
three phase AC ammeter, a power meter, a power
factor meter, a frequency meter, and a three phase
AC voltmeter.
AC Ammeter (A−)
The ammeter displays the percentage of full load
current in amperes (1−125%).
Power Meter (kW)
The power meter displays the real power in per-
centage of full load in kilowatts (0−125%).
Power Factor Meter (PF)
The power factor meter displays real power deliv-
ered to the load (1.0−0.6 lagging) and (1.0−0.9
leading).
Frequency Meter (Hz)
This meter displays the output frequency (percent-
age of nominal frequency), of the power source
connected to the load (70−110%).
AC Voltmeter (V−)
The voltmeter displays the percentage of line to
neutral voltages of either power source connected
to the load (70−110%).
FIGURE 2-2. BARGRAPH METER PANEL
SWITCH PANEL
The switch panel (Figure 2-3) contains six indica-
tor lamps and three membrane pushbuttons.
FIGURE 2-3. SWITCH PANEL
Indicator Lamps
Source 1 Available and Source 2 Available
These indicators are lit when the corresponding
sources have acceptable output voltage and/or
frequency. These indicators can be lit simulta-
neously.
Source 1 Connected
This indicator is lit when the transfer switch is in the
normal position and Source 1 is supplying power to
the load.
Source 2 Connected
This indicator is lit when the transfer switch is in the
emergency position and Source 2 is supplying
power to the load.
Not in Auto
This indicator lights when the transfer switch is not
in the Automatic mode of operation and when any
of the following signals are active:
S Drawout lever is in the Release Position
S Control Mode/Configuration is set to “Off-
line”
S Bypass switch is connected to Normal or
Emergency
Test/Exercise Active
The Test/Exercise Active indicator is lit when the
transfer switch test or exercise operation is active.