Troubleshooting Flow Charts; Introduction To Troubleshooting; No Transfer To Standby - Guardian 5240 Diagnostic Repair Manual

SECTION 3.3

TROUBLESHOOTING FLOW CHARTS

The first step in troubleshooting is to correctly identify the problem. Once that is done, the cause of the problem
can be found by performing the tests in the appropriate flow chart.
Test numbers assigned in the flow charts are identical to test numbers in Section 3.4, "Diagnostic Tests." Section
3.4 provides detailed instructions for performance of each test.
Problem 5 - In Automatic Mode, No Transfer to Standby
TEST 21 - CHECK
VOLTAGE AT
TERMINAL LUGS
E1 & E2
GOOD
TEST 22 - CHECK VOLTAGE
AT STANDBY CLOSING COIL
C2 AND LIMIT SWITCH XB1
C2 COIL VOLTAGE
BAD / LIMIT SWITCH
XB1 VOLTAGE BAD
TEST 23 - TEST
TRANSFER
RELAY
BAD
REPLACE
Page 64

INTRODUCTION TO TROUBLESHOOTING

FIND CAUSE OF NO AC
OUTPUT TO TRANSFER
BAD
SWITCH FROM
GENERATOR
C2 COIL VOLTAGE
GOOD BUT NO
TRANSFER
C2 COIL VOLTAGE
BAD / LIMIT SWITCH
XB1 VOLTAGE GOOD
TEST 33 -
CONTINUITY TEST
OF WIRING (C2)
GOOD
GOOD
PART 3
TEST 24 - CHECK
GOOD
MANUAL TRANSFER
SWITCH OPERATION
TEST 25 - TEST
LIMIT SWITCH
XB1
REPAIR OR
BAD
REPLACE
TEST 26 - CHECK #23
AND #194 WIRING
CONNECTIONS
"V-TYPE" PREPACKAGED
TRANSFER SWITCHES
REPAIR OR
BAD
REPLACE
REPLACE
STANDBY
COIL C2
REPLACE
LIMIT
BAD
SWITCH
REPAIR
GOOD
WIRE #B