Check ENCU Power Circuit
electrical
Description
The ENCU-44 terminal circuit is shorted when energized or open at other times, and the unit alarms only.
Activation Conditions
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 Behavior
Alarm only.
Reset Conditions
Auto reset when the circuit is normal, or alarm may be manually reset using the display mounted keys or by turning the unit off, then back on again.
Corrective Actions
1. Check Wiring a. Inspect Power Module and ENCU connectors. Verify that 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 PM-32. If no voltage at PM-32, download data and replace power module. 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 damage, moisture or corrosion. d. Place the SROS in the OFF position and check continuity of the wiring from ENCU-19 to PM-28. 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.