Carrier TRANSICOLD Vector 8500 User Manual

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05012 CHECK ENCU POWER CIRCUIT
NOTE
When operation of the engine is required the main microprocessor will provide a signal from terminal
3MM−9. This signal has been referred to as the “run relay”, based on pre−APX control systems that
had an actual relay in place. Whenever the term “run relay” is used in APX control system discussion,
it is referring to the engine run output from 3MM−9 to the ENCU at terminal ENCU−44.
• ACTIVATION: A problem has been detected in the ENCU−44 terminal circuit. If this alarm is activated while
the circuit is energized, the circuit is detected shorted. If this alarm is activated at any other time, the circuit
is detected open.
• UNIT CONTROL: Engine and Electric Operation: Alarm only.
• RESET CONDITION: Auto reset when the circuit is normal, or alarm may be manually reset using the dis-
play 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, the active
alarm should clear itself (refer to reset condition above). 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 Wiring
a. Inspect main microprocessor 3MM & ENCU connectors. Verify there is no damage to module, and
no damage, moisture, or corrosion in connector.
b. Use Component Test Mode (Refer to Section 5.2.4) to energize the circuit. Must have minimum 11
VDC at 3MM−9. If no voltage at 3MM−9, download data and replace main microprocessor. Refer to
Section 5.5.
c. With circuit still in Component Test Mode check voltage at ENCU−44. Must have minimum 11 VDC
at ENCU−44. If no voltage at ENCU− 44, check connectors and wiring between terminals for dam-
age, moisture or corrosion.
d. Place the SROS in the OFF position and check continuity of the wiring from ENCU−19 to the
“ENCUGND” connector extending from the battery negative cable connection. Check connectors
and wiring between terminals for damage, moisture or corrosion.
2. Check ENCU
Replace ENCU with a known good component. Calibrate sensor and ENCU. Refer to Section 8.5.13

Carrier TRANSICOLD Vector 8500 Specifications

General

Brand	Carrier TRANSICOLD
Model	Vector 8500
Category	Automobile Accessories
Language	English