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03001
ENGINE LOAD CALIBRATION
• ACTIVATION: Activate alarm if:
Condition 1 = At engine start if the engine throttle sensor (Rack Position Sensor) value is less than
90%.
Condition 2 = After start if the sensor value does not drop below 90% within 5 seconds.
Condition 3 = At engine shutoff if the sensor value does not drop below 10% within 5 seconds.
• UNIT CONTROL: Alarm only. Control system will modulate CSMV and activate Economizer Control as
required.
• RESET CONDITION: Alarm may be manually reset using the display mounted keys 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). (Refer to Note 1 in
Section, page 7-2.) Operate the unit through the appropriate modes to see if
any active alarm occurs. Continue with the steps below as necessary.
CORRECTIVE ACTIONS:
1.
Check Rack Position Sensor (RPS) Power And Wiring
a. Inspect sensor, connector pins & terminals. No physical damage to sensor. No damaged or corro-
sion in connections.
b. If required, power sensor by placing the unit in PC Mode, check for power. Voltage reading between
connector position 1 (positive) and position 2 (negative) should be 5 volts DC. Check connectors
and wiring between terminals for damage, moisture or corrosion.
c. Check for continuity from connector terminal 3 to ENCU
−
7. If good continuity is not present, check
connectors and wiring between terminals for damage, moisture or corrosion.
2.
Perform Engine Load Calibration
Perform Engine Load Calibration as referenced in
.
3.
Replace Rack Position Sensor
(RPS)
Replace sensor with know good component. Calibrate sensor and ENCU. Refer to
.
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