Carrier VECTOR 6500 Operation & Service Manual page 226

Alarm
Steps
NO.
P190 CHECK CONDENSER FAN MOTOR
•
TRIGGER–ON Normal draw for the condenser fan motors is 0.8 to 3.5 Amps (460 VAC). The circuit
tests outside this range.
•
UNIT CONTROL:
•
RESET CONDITION: Auto Reset if Pretrip is started again, 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, clear the
alarm(s). (See Note 1 page 7−2.) Operate the unit through the appropriate modes to see if any active alarm
occurs. Continue with the steps below as necessary.
1 Check Amp Draw of Condenser Fan Motor Circuit
a. With the unit running use a clamp on
ammeter to check the current draw
at CDCON on all 3 legs.
b. Check fuses for condenser fan mo-
tors.
c. Check voltage at CDCON contacts. Must be within range shown in Section 2.11 for
2 Check Condenser Fan Motors
460
a. Check condenser fan motors.
VAC
CIR-
CUIT
b. With the unit off, visually check fan
motors and fan blades.
c. With the unit off, check the resist-
ance of the condenser fan motor
windings.
3 Check Condenser Fan Motor Connections
Inspect high voltage connections at
the condenser fan motors.
4 Verify Accuracy of AC Current Sensor
Put microprocessor in PC Mode. Re-
fer to Section 5.3 page 5−3.
Alarm/Cause
Engine and Standby Operation: Pretrip will fail and display
"PRETRIP FAIL AND COMPLETED".
7−93
Corrective Action
Must be within range shown in Section 2.11 for all
three legs.
If higher than normal draw is read, the wiring for the
motors must be separated, and each motor tested in-
dividually.
F26, F27, and F28 must not be blown.
L1-L2, L1-L3, and L2-L3.
Must be within range shown in Section 2.11 for
T1-T2, T1-T3, and T2-T3.
No visual physical damage.
No blockage due to debris.
Remove and replace if required.
No visual physical damage.
No blockage to fan blades.
Fan blades spin freely.
Remove and replace if required.
See Section 2.11 for correct resistance.
Resistance (Ohms) must be in range.
No continuity from any high voltage lead to ground.
No corrosion, water damage or burning / discolor-
ation.
Remove, repair, or replace if required.
Must have 0 AC1 Amps and 0 AC2 Amps in Unit
Data.
62-11389