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SHORT TERMINALS
B TO W.
YES
DID MOTOR
DRIVE AT
NORMAL
SPEED?
NO
REPLACE Q3.
YES
CONNECT OPERATING
VOLTAGE. OPEN INPUT
FROM CONTROLLER.
NO
MEASURE
AC VOLTAGE AT
TERMINALS 1 AND L2.
Fig. 10. Flowchart to troubleshoot output Triac switch circuits for 4-20 mA input.
YES
DID MOTOR
DRIVE OPEN?
MEASURE
AC VOLTAGE AT
NO
TERMINALS L2 TO 1.
DID MOTOR
DRIVE
CLOSE?
YES
SHORT TERMINALS
B TO W.
IS VOLTAGE
LESS THAN
10V?
YES
IS OPERATING
VOLTAGE
NO
120V?
NO
9
TRIAC OUTPUT CIRCUIT IS OKAY.
YES
REPLACE OR TROUBLESHOOT
PRINTED WIRING BOARD USING
SCHEMATICS.
DID MOTOR
DRIVE AT
NORMAL
SPEED?
NO
REPLACE Q4.
YES
IS VOLTAGE
LESS THAN
10V?
NO
YES
DID MOTOR
DRIVE OPEN?
NO
REPLACE Q4, A5, R31, R32.
REPLACE Q4
R7195A,B MOTOR POSITIONER
REPLACE Q4.
YES
REPLACE Q3,
A4, R28, R29.
IS OPERATING
VOLTAGE
120V?
NO
REPLACE Q3.
REPLACE Q3.
REPLACE CR12
M20795
63-2582
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