Check Standby Contactor Circuit
electrical
Description
The PSCON or PSCON2 contactor coil tested outside the normal 0.0 to 1.0 Amps (12 VDC) range; pretrip fails and shows “PRETRIP FAIL AND COM- PLETED”.
Activation Conditions
Normal amps for the PSCON or PSCON2 contactor coils 0.0 to 1.0 Amps (12 VDC). The circuit(s) test outside this range. (During this test either PSCON or PSCON2 will be tested depending on the phase reversal module.)
Unit Behavior
Engine and Electric Operation: Pretrip will fail and display “PRETRIP FAIL AND COM- PLETED”.
Reset Conditions
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.
Corrective Actions
1. Check PSCON and PSCON2 a. Inspect PSCON and PSCON2 contactor coils and wire connections. Verify there is no damage to coils, and no damage, moisture, or corrosion in connections. b. Check contactor coil resistance. Refer to Section 2.12 for resistance values. 2. Check PSCON and PSCON2 Amp Draw a. Check PSCON and PSCON2 contactor coils amp draw. Use Component Test mode (Section 5.2.4) to test. Refer to Section 2.12 for amp values. View current draw in Component Test mode screen. b. Listen for PSCON or PSCON2 to pull in. WARNING ! Caution and good electrical practices must be used when working around and with high voltage circuits. If PSCON or PSCON2 contactor pulls in, PSCON / PSCON2 are OK. If PSCON or PSCON2 contactor does not pull in, check for 12 VDC across the coil. If 12 VDC across A-1 and A-2, check wiring from A-1 to B-1, if wiring is OK, replace contactor. No voltage - check F9. 3. Check PSCON, and PSCON2 Wiring - Inspect harness and control box connector pins and terminals. (See wiring schematic Section 10.3) Verify there is no physical damage to harness, and no damage, moisture, or corrosion in connectors.