Carrier VECTOR 6500 Operation & Service Manual page 195

Alarm
Steps
NO.
99 CHECK STANDBY CONTACTOR
•
TRIGGER–ON: Standby motor contactor relay (PSCONR) circuit is shorted. (The relay output from
the microprocessor (5MP7) is negative, so the circuit will not be shorted to ground, but is shorted
either within the relay coil itself, or to a positive wire.)
•
UNIT CONTROL: Engine and Standby Operation: alarm only. In engine Operation, the unit will con-
tinue to operate. In Standby the refrigeration system will not operate.
•
RESET CONDITION: Auto Reset when the PSCONR Coil current (amp) draw is normal, or alarm
may be manually reset via keypad or by turning the unit off, then back on again.
NOTE: Follow the steps below until a problem is found. Once a repair or correction has been made, the active
alarm should clear itself (see reset condition above). Operate the unit through the appropriate modes to see if
any active alarm occurs. Continue with the steps below as necessary.
1 Check PSCONR
a. Inspect standby contactor relay
coil and terminals.
b. Check contactor coil resistance.
c. Check amp draw of coil.
2 Check PSCONR Current Draw
Use Component Test Mode to test
actual current draw of the circuit.
(Refer to Section 5.2.2.)
3 Check PSCONR Wiring
Inspect harness & control box con-
nector pins & terminals. (See wiring
schematic Section 10.)
62-11389
Alarm/Cause
7−62
Corrective Action
No damage to coil.
No damage or corrosion.
Refer to Section 2.12 for correct electrical values.
Cannot be opened (infinite ohms), shorted (Zero
Ohms) or shorted to ground.
Refer to Section 2.12 for correct electrical values.
Use ammeter.
Refer to Section 2.12 for correct electrical values.
View current draw in Data List.
No physical damage to harness.
No damage, moisture, or corrosion in connectors.