Hubbell LX-450, LX-440 User Manual

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Hubbell Industrial Controls, Inc.

A subsidiary of Hubbell Incorporated

4301 Cheyenne Drive

Archdale, NC

Telephone (336) 434-2800FAX (336)434-2803

Instruction Manual

Transfer switches

LX-440Non-Automatic

LX-450Automatic

100, 200, 260, 400, 600, 800, 1000, 1250 Ampere

2, 3, 4 Pole

Publication No. 201

April, 2001

 

Transfer Switch

 

 

Table of Contents

 

1.0

Introduction....................................................................................................................................

3

2.0

Specifications and Certifications ..................................................................................................

4

Specifications .....................................................................................................................................

4

Certifications ......................................................................................................................................

4

3.0

Installation......................................................................................................................................

4

Receiving and Storage........................................................................................................................

5

Location..............................................................................................................................................

5

Line Connections................................................................................................................................

5

4.0

Operation........................................................................................................................................

5

Automatic Operation ..........................................................................................................................

6

5.0

Standard and Optional Features ..................................................................................................

7

Standard Features ...............................................................................................................................

7

Optional Features................................................................................................................................

8

6.0

Maintenance .................................................................................................................................

10

Transfer Test.....................................................................................................................................

10

Troubleshooting................................................................................................................................

11

Settings .............................................................................................................................................

11

7.0

Transfer Control Relay Board....................................................................................................

12

8.0

Plant Exerciser Timer .................................................................................................................

14

Set the time .......................................................................................................................................

14

Programming ....................................................................................................................................

14

9.0

Spare Parts and Drawing References ........................................................................................

16

Spare Parts ........................................................................................................................................

16

Drawing References .........................................................................................................................

16

Page 2 of 16 Pages

Transfer Switch

1.0 Introduction

Hubbell’s non-automatic,LX-440,and automatic,LX-450,transfer switches are available in 2, 3, and 4 pole models with ampere ratings of 100 to 1250 A. The transfer switches are available as open type or in an individual cabinet.

The automatic transfer switch has a Solid State Transfer Control Module, LX-301,that monitors voltage and controls the transfer to and from the normal and emergency sources. Thenon-automatictransfer switch has a selector switch to manually initiate transfer. A handle is included with all transfer switches to manually close the normal or emergency contacts.

Emergency

 

TSE

 

 

Source

 

 

Normal

 

TSN

 

 

Source

 

To load

PRM

 

 

Switching

optional

 

Mechanism

 

Normal Source

Emergency Source

 

Transformer

Transformer

 

Transfer Control

 

Control

Relay Board

 

Module

 

 

(LX-301)

 

 

To engine start contacts

(If generator backup)

Figure 1-1 Block Diagram of automatic transfer switch showing one phase

Page 3 of 16 Pages

Transfer Switch

2.0 Specifications and Certifications

Specifications

Switch Mechanism

Solenoid Actuation

 

Short Circuit Ratings of Transfer Switches

RMS Symmetrical Amperes

 

100 A

42,000

 

200 A

50,000

When protected by

260, 400, 600 A

65,000

a circuit breaker.

800, 1000, 1250 A

85,000

 

Control Voltage

120 VAC

 

Pick-upVoltage

90% of normal source voltage

 

90% of emergency source voltage

Drop-outVoltage

84% of normal source voltage

 

84% of emergency source voltage

Auxiliary Contacts

10 A, 125/250 VAC

 

Note

Time delay settings and voltage pick-upanddrop-outlevels are set at the factory and should not be changed without consulting the factory.

Certifications

Hubbell’s Automatic transfer switches meet the requirements for all of the certifications listed below.

UL 1008 Standard for Safety for automatic transfer switches

NEC Article 517, Health Care facilities NEC Article 702, Optional Standby Systems

NEC Article 701, Legally Required Standby Systems (LX-450only)

NFPA 20 Installation of Fire Pumps

3.0 Installation

Refer to the transfer switch nameplate to ensure that the voltage, current, and horsepower ratings are compatible with the load.

Refer to the receiving, handling, storage, installation, and inspection procedures in the Instruction Manual that accompanies the combination Fire Pump Controller and automatic transfer switch. Many of the procedures in the installation section are applicable to the automatic transfer switch in the adjoining cabinet. For automatic transfer switches sold as an individual unit, and for additional information, follow the procedures below.

Page 4 of 16 Pages

Transfer Switch

Receiving and Storage

After receiving the transfer switch inspect the cabinet for any damage that may have occurred during shipping. If the transfer switch is not installed immediately, cover the cabinet and store in a dry area. Condensation can corrode the contacts and other metal parts.

Location

The transfer switch should be located as close as possible to the engine generator or to the alternate power source. If possible, there should be a clear line of sight between the transfer switch and the engine generator.

Line Connections

Refer to the drawings posted inside the cabinet door and in the drawing packet for customer connections.

Before drilling and punching holes in the cabinet for wiring connections cover the transfer switch with a protective covering. Small debris falling into the automatic transfer switch may jam the switching mechanism or may cause electrical failure.

Ensure that the normal (primary), emergency (alternate), and load isolation switches are open before making connections. Connect the load, normal source, and emergency source power cables in the same phase sequence. Refer to the latest NFPA 70 and Field Connections Wiring Diagram for cable sizes and torque requirements.

All other standard customer connections are made to PTB1 on the left side of the mounting panel. Use approved 14-gaugewire for all control connections. Typical field connections are shown below.

Terminal Connections

Description

 

 

PTB1-1and–2

Engine Start Contact, for generator set

 

 

PTB1-5and-6

TSNa4 contacts closed, normal position

 

 

PTB1-7and-8

TSNa3 contacts closed, normal position

 

 

PTB1-9and-10

TSEa4 contacts closed, emergency position

 

 

PTB1-11and-12

TSEa3 contacts closed, emergency position

 

 

TSN - Auxiliary Contact, Normal source TSE - Auxiliary Contact, Emergency source

After installation is complete, perform a transfer test as described in section 6.0 Maintenance.

4.0 Operation

Refer to the schematic and wiring diagrams that are provided with the transfer switch. These drawings are provided in a packet, along with this manual. A schematic is also posted on the inside of the cabinet door.

Page 5 of 16 Pages

Transfer Switch

The Hubbell Transfer Control Module, LX-301,controls transfer to the emergency source and retransfer to the normal source. TheLX-440non-automatictransfer switch does not come with a Control Module. A selector switch initiates transfer and retransfer.

Automatic Operation

Transfer to Emergency Source

The Control Module monitors the normal source phase voltage for acceptable limits of drop-outandpick-up.ANORMAL OVERRIDE ON MOMENTARY OUTAGE time delay is provided to override voltage dips causing nuisance starting of the engine generator set. If the normal source voltage is restored above thepick-upsetting within the time delay period, the delay timer is reset.

If the NORMAL OVERRIDE ON MOMENTARY OUTAGE time delay expires before the normal source voltage is restored, the normal source electronic control initiates engine starting of the generator set and/or activates the emergency source electronic control. The engine control relay is a 12 VDC latching relay on the Control Module. The customer connections for the engine start contacts are on PTB1 located on the left side of the transfer switch mounting panel. Refer to the Field Connections Wiring Diagram posted on the inside of the cabinet door and in the drawing packet for customer connections.

The emergency source electronic control monitors the emergency source for the acceptable voltage and frequency pick-uplevels. When both the voltage and frequency of the emergency source are verified, 24 VDC from the Control Module energizes the TCR (Transfer Control Relay). The normally open contacts of the TCR close to power the transfer switch switching mechanism via emergency transformer XFMR2. After the emergency source contacts close, auxiliary contacts TSEb1 open to disconnect power to the switching mechanism.

Transfer switches with the NEUTRAL POSITION TIME DELAY, stop in the neutral position. After the adjustable time delay expires, Q1 on the TCR board turns on to energize the TR relay. The TR relay contacts close tore-connectpower to the switching mechanism to complete the transfer.

An EMERGENCY OVERRIDE ON MOMENTARY OUTAGEtime delay is provided to override momentary voltage dips preventing the transfer switch from retransferring to the normal source. If the emergency source voltage is restored above the pick-up setting within the delay period, the delay timer is reset.

Retransfer to Normal Source

When the Control Module detects that the normal source voltage rises above the pick-upsettings, the timing sequence starts for retransfer to the normal source. TheRETRANSFER TO THE NORMAL time delay starts to allow the normal source to stabilize before retransfer. If the normal source does not meetpick-uprequirements, the delay timer is reset.

At the end of this delay, the TCR is de-energized.The normally closed contacts of the TCR close. The switching mechanism is then powered by 120 V from the normal transformer, XFMR1, through the TCR relay contacts. After the normal source contacts close , auxiliary contact TSNb1 opens to disconnect power to the switching mechanism.

Transfer switches with the NEUTRAL POSITION TIME DELAY, stop in the neutral position. After the adjustable time delay expires, the TR contacts close to complete transfer.

Page 6 of 16 Pages

Transfer Switch

5.0 Standard and Optional Features

Standard Features

The following standard features are provided with the LX-450automatic transfer switch.

Indicating lights

NORMAL (PL1, Green) When the transfer switch is in the normal position (normal source contacts closed) auxiliary contactTSN-1NOcloses to power the pilot light.

EMERGENCY (PL2, Red) When the transfer switch is in the emergency position (emergency source contacts closed) auxiliary contactTSE-1NOcloses to power the pilot light.

Control Module

LED Indicators

EMERGENCY FREQUENCY MONITOR LED (Green) This LED is on when the emergency source frequency is within the operating range.

EMERGENCY VOLTAGE MONITOR LED (Red) This LED is on when the emergency source voltage is above thepick-uplevel.

ENGINE RUNNING UNLOADED LED (Red) This LED is on when the engine generator is running during the cool down interval.

NORMAL VOLTAGE MONITOR LED (Green) This LED is on when the normal source voltage is above thepick-uplevel.

RETRANSFER TO NORMAL SOURCE LED (Red) This LED is on during the RETRANSFER TO NORMALtime delay after the normal source voltage rises above the pick-up level.

TRANSFER TO EMERGENCY SOURCE LED (Red) This LED is on during the TRANSFER TO EMERGENCYtime delay after the emergency source voltage and frequency is above the pick-up level.

Time Delays

ENGINE RUNNING UNLOADED TIME DELAY This time delay is provided to allow the engine generator to run for a cool down period after retransfer to the normal source. At the end of this period, the engine control relay contacts activate to shutdown the engine generator.

OVERRIDE MOMENTARY OUTAGES ON EMERGENCY SOURCE This time delay overrides a retransfer to the normal source when the emergency source voltage is low or drops out momentarily.

OVERRIDE MOMENTARY OUTAGES ON NORMAL SOURCE This time delay overrides transfer when the normal source voltage is low or drops out momentarily.

RETRANSFER TO NORMAL This time delay allows the normal source to stabilize before retransfer.

TRANSFER TO EMERGENCY This time delay allows the emergency source to stabilize before retransfer.

Page 7 of 16 Pages

Transfer Switch

Auxiliary Contacts

Auxiliary contacts TSNa3, -a4and TSEa3,-a4are available for remote alarms, pilot lights, or other applications. These contacts arepre-wiredfor customer connections toPTB1-7throughPTB1-12.The contacts are rated at 10 A, 125/250 VAC.

Manual Disconnect Switch

The MDS (Manual Disconnect Switch) is mounted on the TRC board. This switch isolates the power source to the switching mechanism. Then the automatic transfer switch can only be operated manually with the handle.

CAUTION: Disconnect normal and emergency power sources before using handle to transfer the contacts.

TEST push button

The TEST push button simulates a loss of power from the normal source and causes the Control Module to initiate transfer to the emergency source.

Optional Features

The items described in this section are a few of the optional features available with the LX-450automatic transfer switch. Contact the local Hubbell representative for additional options desired for an application. Refer to the job schematic and wiring diagrams for these and other features.

BYPASS/RETRANSFER TO NORMAL push button (S1)

This option is standard for combination Fire Pump Controller with automatic transfer switch to meet NFPA 20 specifications.

Pressing this button allows the transfer switch to retransfer to the normal position bypassing the

RETRANSFER TO NORMAL SOURCE time delay.

Phase Rotation Monitor (H1)

The PRM (Phase Rotation Monitor) contacts open if the phase rotation of the normal power source is not correct. If the proper phase sequence is not sensed, the LX-301Control Module does not output a signal to the TCR board to retransfer the transfer switch to the normal source.

Auxiliary Contacts (A1–A4)

One additional NO/NC set of contacts may be added to the normal and the emergency source side of the transfer switch. The contacts are rated for pilot duty: 10 A at 125 or 250 VAC.

BYPASS/TRANSFER TO EMERGENCY push button (S2)

This push button overrides the time delay to transfer to the emergency source.

Page 8 of 16 Pages

Transfer Switch

Plant Exerciser (B1–B2)

The Plant Exerciser option is a seven-dayclock that provides for automatic test operation of the generator set atpre-selectedintervals. The clock is powered by a fused circuit from control transformer XFMR3. The Plant Exerciser option is used in conjunction with contacts to initiate engine starting without a load transfer, option B1. Option B2 includes a selector switch to simulate a power failure with or without a load transfer.

Refer to section 8, pages 14-15,for instructions to program the Plant Exerciser timer.

Remote Test (R7)

This option provides terminal points for the connection of remote devices that are normally closed and wired in series with the TEST push button. An open circuit simulates failure of the normal source and initiates transfer to the emergency source.

Selector Switch (R2–R4)

Selector switches are available to set the transfer switch for testing, automatic or manual mode, and to test start the engine for troubleshooting and maintenance. Selector switches with an OFF position, option R2, include an OFF indicating light (PL4, white). Switches with aTEST position initiate a load transfer.

NEUTRAL POSITION TIME DELAY (N)

When the normal source contacts open, the NEUTRAL POSITION TIME DELAY starts. The timer circuit on the TCR board, temporarily disconnects the power source to the switching mechanism while the automatic transfer switch is in the neutral position (normal and emergency source contacts open). The adjustable timer is usually set for three seconds. The redSTART DELAY LED indicates the timer is counting. After the delay, the greenEND DELAY indicates the TR (timer relay) is energized to reconnect power to the switching mechanism.

Page 9 of 16 Pages

Transfer Switch

6.0 Maintenance

DANGER: Do not touch the transfer switch until ALL power is disconnected. Shocks, burns, or death may result from high voltage.

CAUTION: Only personnel who are familiar with the power distribution system and this manual should be allowed to inspect or perform maintenance on the transfer switch.

Preventive maintenance

The following checks should be preformed as part of routine maintenance:

A transfer test of the transfer switch should be preformed every week.

The transfer switch should be kept clean of dust and moisture. DO NOT USE A BLOWER TO CLEAN the switch or the inside of the enclosure. Always use a clean cloth or vacuum to prevent debris from lodging in the switching mechanism.

Check all wiring connections.

Visually inspect the contacts for surface deposits and pitting. This inspection should be preformed annually.

Transfer Test

After installation, and each week thereafter, check the operation of the transfer switch by performing a manual and an automatic transfer.

Manual Test

WARNING: Disconnect the emergency and normal power sources before transferring with the handle. Manual operation is only for testing the mechanical operating mechanism or switching when there is a control problem.

Manual operation of the transfer switch is performed by sliding the square notch at the end of the handle onto the end of the square bar on the left side of the switch. Push the handle up to transfer to the normal source (A). To transfer the switch to the emergency source (B) insert a screw driver in theTRIP hole to put the switch in the neutral position. Then push the handle up and insert a screw driver into theSELECT hole to transfer the switch to the emergency source.

CAUTION: Do not leave the handle on the square bar. The handle prevents closure of the cabinet door and may cause damage to or prevent emergency operation of the transfer switch.

Page 10 of 16 Pages

Transfer Switch

Auto Test

The following procedure is an example for testing the automatic transfer switch. A procedure should be written by qualified personnel that is applicable to the facility, the transfer switch options, and the power distribution system. Refer to job specifications for timing delays.

CAUTION: Always close enclosure door when switch transfers with power connected.

1.Press the TEST push button until the engine generator starts or automatic transfer switch transfers if emergency source is a second utility.

2.Verify that the NORMAL indicator goes off and the EMERGENCY indicator comes on per the time delay settings.

3.Verify that the automatic transfer switch transfers to the emergency source.

4.Verify that the automatic transfer switch retransfers to the normal position after 30 minutes or press the optional BYPASS/RETRANSFER TO NORMAL push button.

5.If the emergency source is a generator set, verify that the engine runs unloaded for five minutes.

Troubleshooting

Hazardous voltage

will shock, burn,

! DANGER or cause death. Do not touch

until ALL power is disconnected.

WARNING: Disconnect ALL power supply sources to the transfer switch before servicing to prevent shock or accident hazard.

Before troubleshooting, perform the following checks:

a.visual inspection for physical damage.

b.ensure that all switches are in the normal operating position.

c.ensure that the engine generator is operational or the alternate source is available.

d.ensure that all wiring connections are secure.

See Table 6-1,page 12, for some examples of possible problems that could occur and steps to take for repair.

Settings

Voltage and time delay settings are factory set per job specifications. DO NOT CHANGE VOLTAGE SETTINGS WITHOUT CONSULTING HUBBELL ICD. The table below lists the typical time delay settings.

Page 11 of 16 Pages

Transfer Switch

Time Delay function

Typical factory setting

Adjustment Range

NORMAL OVER-RIDEON

1 second, engine generator

0.5 to 6 seconds

MONETARY OUTAGE

3 seconds, utility

 

RETRANSFER TO NORMAL

30 minutes

2 to 30 minutes

ENGINE RUNNING UNLOADED

5 minutes

2 to 30 minutes

EMERGENCY OVER-RIDEON

1 second

0.5 to 6 seconds

MOMENTARY OUTAGE

 

 

TRANSFER TO EMERGENCY

2 seconds

0 seconds to 5 minutes

NEUTRAL POSITION TIME DELAY

3 seconds

1 second to 10 minutes

(optional)

 

 

Frequency Monitor

60 Hz

30 to 100 Hz

Table 6-1Troubleshooting

Condition

Possible cause

Checks

Action

 

Switching mechanism

Isolate power sources

Actuate transfer switch

 

jammed

manually

Automatic transfer

 

 

 

 

 

Check for 115 V output

 

switch does not transfer

Transformer fault

Replace transformer

LED’s on Control

 

from transformers

 

 

Inspect board for damage

 

Module indicate proper

 

 

timing sequence,

TCR board fault

Check TCR and TR

 

voltage, and frequency

relays

Repair/Replace TCR board

 

 

Check board components

 

 

 

with ohm meter

 

 

 

 

 

 

Phase Rotation

Check for correct phase

Correct line connections for

 

sequence.

proper phase sequence.

Automatic transfer

Monitor fault

Check PRM w/ ohm

Replace PRM

switch transfers when

(ATS/Fire Pump)

meter

 

normal source OK

 

 

 

Control Module

Check VOLTAGE

Repair/Replace Control

 

 

MONITOR LED’s

Module

 

 

 

 

 

 

 

Engine Start Relay

Check contacts at PTB1-

Replace MB relay

Engine generator does

1 and -2

 

 

not start

Control Module fault

Check Engine Start

Repair/Replace Control

 

Contacts

Module

 

 

Engine generator

Engine Start Relay

Check relay on Control

Repair/Replace Control

continues to run

fault

Module

Module

unloaded

Relay circuit fault

 

 

 

 

 

 

7.0 Transfer Control Relay Board

Refer to schematic 49271-500.

The primary purpose of the Transfer Control Relay board is to control the operation of the switching mechanism. The board also has the isolation switch alarm circuit and relays.

Page 12 of 16 Pages

Transfer Switch

Components

 

1.

Transfer Control Relay

 

 

Controls whether the automatic transfer switch is in the normal or the emergency position.

 

De-energized- automatic transfer switch in Normal position

 

Energized - automatic transfer switch in Emergency position

2.

Timer circuit (not used on assembly –101and-104)

 

This circuit determines how long the automatic transfer switch stays in the neutral position. Jumper

 

JMP1 selects one of four ranges.

 

 

Potentiometer P1 adjusts the time within that range. The four ranges are:

 

1–6seconds

20–120seconds

 

5–30seconds

100–600seconds

3.

Manual Disconnect Switch (not used on assembly-103)

 

Opening this switch disconnects power from the control transformers to the switching mechanism.

 

Then the transfer switch can only be switched manually using the handle.

Assembly versions

For LX-450

49271-101No timer with MDS.

49271-102Includes timer and MDS.

49271-104No timer with MDS and monitor for AUTO/MANUAL switch.49271-105Includes timer, MDS, and monitor for AUTO/MANUAL switch.

Page 13 of 16 Pages

Transfer Switch

8.0 Plant Exerciser Timer

Set the time

1)Press the Res. (reset) button to clear the memory

2)Press and hold the (time/run mode) button while setting the time

a)Press the h button to set the hours

b)Press the m button to set the minutes

c)Repeatedly press the Day button to select the day of the week(1—7,Monday–Sunday)

3)When set correctly, the colon between the hours and minutes flashes

4)To reset for daylight savings time

a)Press the ±1h button one time in the spring to advance the time one hour

b)Press ±1h one time in the fall to set the time back one hour

Notes

The time and theday of the week must be set before programming the Timer.

The Timer has sufficient back up power to maintain the time and program settings for up to four days.

Programming

1)To set the Timer to transfer the transfer switch with load or no load once a week and run generator set for thirty minutes,

Friday at 9:00 a.m.

a)Press the Prog. (program) button to display the day of the week and time setting for the program

b)Press the (ON/OFF) button once to display the ON (open circle) symbol

c)Press h to set the hours until09 AM is displayed

d)Press m to set the minutes until00 is displayed

e)Press Day eight times to select5 (Friday) as the day of the week to run

(Press the button four times to select Monday or up to 10 times to select Sunday.)

f)Press Prog. button

g)Press twice to display the OFF (open circle with dot) symbol

h)Repeat steps c), d), and e) to set 9:30 a.m., Friday

i)Press Prog. button

j)Press the (time/run mode) button

2)To review the programming

a)Press Prog. once to see the transfer time

Page 14 of 16 Pages

Transfer Switch

b)Press Prog. a second time to see the retransfer time.

c)Press Prog. a third time to see the number of additional program times

Fr18

3)To manually override the Timer press the button

a)Pressing once transfers the Timercontacts—outputON (starts the engine) Automatic control resumes after the next programmedevent—temporaryoverride

b)Press twice consecutively turns the outputON—permanentoverride

c)Press three times consecutively to turn the outputOFF—permanentoverride

d)Press until the symbol appears to end theoverride—returnto run mode

4)To delete a program

a)Press Prog. to display the program to delete

b)Press m until the display is blank

c)Press h until the display is blank

d)Press to return to run mode

Page 15 of 16 Pages

Transfer Switch

9.0 Spare Parts and Drawing References

The following lists contain part numbers and drawing numbers for identification and for ordering. If materials are needed from Hubbell, contact the local Hubbell representative to request the desired information or parts.

Spare Parts

Description

Part No.

Spares

Description

Part No.

Spares

2 Years

2 Years

 

 

 

 

 

 

 

 

 

 

Transformer

 

 

Phase Rotation Monitor

 

 

100 VA

57511355

1

208–260V

57418-398

1

200 VA

57511343

1

440–480V

57418-399

 

Socket

402066520

 

LX-450TCR Board

 

 

 

 

 

w/o Timer, w/ Switch

49271-101

 

Lens, red

402067520

 

 

 

w/ Timer, w/ Switch

49271-102

1

 

 

 

w/o Timer, w/ Switch

49271-104

 

Lens, green

402066720

 

 

 

w/ Timer, w/ Switch

49271-105

 

 

 

 

 

 

 

120 V Bulb

80324905

2

 

 

 

 

 

 

 

 

 

Black Push Button

80320400

 

AR relay, 2 pole

31658-123

1

 

 

 

 

 

 

12 point terminal strip

57520323

 

AR1 relay, 3 pole

31658-112

1

 

 

 

 

 

 

 

 

 

Plant Exerciser, SPDT

31658139

 

 

 

 

 

 

 

LX-301Control Modules

Standard

 

 

 

Standard

 

 

 

 

 

 

 

 

200 V/3 pole/60 Hz

 

90363-001

 

240 V/3 pole/60 Hz

 

90363-005

 

 

 

 

 

 

 

 

 

208 V/3 pole/60 Hz

 

90363-002

 

440 V/3 pole/60 Hz

 

90363-006

 

 

 

 

 

 

 

 

 

220 V/3 pole/60 Hz

 

90363-003

 

460 V/3 pole/60 Hz

 

90363-007

 

 

 

 

 

 

 

 

 

230 V/3 pole/60 Hz

 

90363-004

 

480 V/3 pole/60 Hz

 

90363-008

 

 

 

 

 

 

 

 

 

Engine Start Relay, 12 VDC

 

31658-076

1

 

 

 

 

 

 

 

 

 

 

 

 

Drawing References

Drawing No.

Title

Drawing No.

Title

 

 

49271-500

Schematic

Transfer Control Relay Board

Notes

As built schematics and wiring diagrams are provided as part of the drawing packet supplied with each transfer switch.

Refer to Bulletin 1000 for information about one year parts and labor warranty.

Page 16 of 16 Pages