Test 30 - Check Fuses F1 And F2; Test 28 - Check Voltage At Utility - Guardian 5240 Diagnostic Repair Manual

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Table of Contents

"V-TYPE" PREPACKAGED

TRANSFER SWITCHES

RESULTS:

1. If voltage reading across the UTILITY 1 and UTILITY 2

terminals is zero, go to Test 30.

2. If voltage reading is good, go to Test 29.

3. For Problem 14 ONLY; if voltage is good, repair N1/N2

open wiring between Transfer Switch and Generator.

TEST 29- CHECK VOLTAGE AT UTILITY

CLOSING COIL C1

DISCUSSION:

Utility source voltage is required to energize util-

ity closing coil C1 and effect retransfer back to the

"Utility" source. This voltage is delivered to the util-

ity closing coil via Wires N1A and N2A, the transfer

relay's normally-closed contacts (relay de-energized),

Wire 126, Limit Switch XA1, and a bridge rectifier.

PROCEDURE:

1. On the generator control panel, set the AUTO-OFF-

MANUAL switch to OFF.

2. Turn off the utility power supply to the transfer switch,

using whatever means provided (such as a utility source

main line circuit breaker).

3. Set the generator main line circuit breaker to its OFF or

"Open" position.

4. Check the position of the transfer mechanism main con-

tacts. The moveable load contacts must be connected

to the stationary utility contacts. If necessary, manually

actuate the main contacts to their "Utility" source side

(load connected to the "Utility" source).

DANGER: BE CAREFUL! HIGH AND

DANGEROUS VOLTAGES ARE PRESENT AT

TERMINAL LUGS WHEN THE GENERATOR

IS RUNNING. AVOID CONTACT WITH HIGH

VOLTAGE TERMINALS OR DANGEROUS AND

POSSIBLY LETHAL ELECTRICAL SHOCK

MAY RESULT. DO NOT PERFORM THIS

VOLTAGE TEST WHILE STANDING ON WET

OR DAMP GROUND, WHILE BAREFOOT, OR

WHILE HANDS OR FEET ARE WET.

5. Disconnect Wire N2A from the utility closing coil (C1).

Connect one meter test Lead to Wire N2A. Use a suitable

and safe connection to this wire, such as an alligator clip

that attaches to the meter test probe. Isolate this wire and

test probe from any other potential source or ground.

6. Set the generator main line circuit breaker to its "On" or

"Closed" position.

7. Set the generator AUTO-OFF-MANUAL switch to AUTO.

a. The generator should crank and start.

PART 3

b. About 15 seconds after engine startup, the

transfer relay should energize and transfer to

the "Standby" source should occur.

8. When you are certain that transfer to "Standby" has

occurred, turn ON the utility power supply to the transfer

switch. After a 15 seconds, retransfer back to the "Utility"

source should occur.

9. Locate on the utility closing coil the terminal that Wire

A is connected to (see Figure 1, Section 3.4). Connect

the other meter test lead to this terminal. Utility line to

line voltage should be indicated. If utility voltage is NOT

indicated, proceed to Step 10.

10.With Wire N2A still connected to one test probe, connect

the other meter test lead to Wire 126 on Limit Switch

XA1 (see Figure 1, Section 3.4). Utility line to line volt-

age should be measured.

RESULTS:

1. In Step 7, if the generator does NOT crank or start, refer

to Part 4, "DC Control".

2. In Step 7, if transfer to the "Standby" source does NOT

occur, go to Problem 1.

3. In Step 9, if normal utility source line-to-line voltage is

indicated but retransfer back to "Utility" does NOT occur,

go to Test 24.

4. If normal utility source line-to-line voltage is NOT indi-

cated in Step 9, but is indicated in Step 10, proceed to

Test 31.

5. If normal utility source line-to-line voltage is NOT indicat-

ed in Step 8, and is NOT indicated in Step 9, proceed to

Test 32.