PRESTO OWNER’S MANUAL
Page 18
POWER STAK
32
Coil2 Driver Open/Short
Shutdown Driver2.
1. Open or short on driver load.
2. Dirty connector pins.
3. Bad crimps or faulty wiring.
32
EM Brake Open/Short
Shutdown EM Brake;
Shutdown Throttle;
Full Brake.
1. Open or short on driver load.
2. Dirty connector pins.
3. Bad crimps or faulty wiring.
33
Coil3 Driver Open/Short
Shutdown Driver3.
1. Open or short on driver load.
2. Dirty connector pins.
3. Bad crimps or faulty wiring.
34
Coil4 Driver Open/Short
Shutdown Driver4.
1. Open or short on driver load.
2. Dirty connector pins.
3. Bad crimps or faulty wiring.
35
PD Open/Short
Shutdown PD.
1. Open or short on driver load.
2. Dirty connector pins.
3. Bad crimps or faulty wiring.
36
Encoder Fault
Shutdown EM Brake;
Shutdown Throttle.
1. Motor encoder failure.
2. Bad crimps or faulty wiring.
3. See Monitor menu Motor: Motor RPM.
37
Motor Open
Shutdown Motor;
Shutdown Main Contactor;
Shutdown EM Brake;
Shutdown Throttle;
Full Brake;
Shutdown Pump.
1. Motor phase is open.
2. Bad crimps or faulty wiring.
38
Main Contactor Welded
Shutdown Motor;
Shutdown Main Contactor;
Shutdown EM Brake;
Shutdown Throttle;
Full Brake;
Shutdown Pump.
1. Main contactor tips are welded closed.
2. Motor phase U or V is disconnected or open.
3. An alternate voltage path (such as an external precharge resistor) is pro-
viding a current to the capacitor bank (B+ connection terminal).
39
Main Contactor Did Not Close
Shutdown Motor;
Shutdown Main Contactor;
Shutdown EM Brake;
Shutdown Throttle;
Full Brake;
Shutdown Pump.
1. Main contactor did not close.
2. Main contactor tips are oxidized, burned, or not making good contact.
3. External load on capacitor bank (B+ connection terminal) that prevents
capacitor bank from charging.
4. Blown B+ fuse.
41
Throttle Wiper High
Shutdown Throttle.
1. See Monitor menu Inputs: Throttle Pot.
2. Throttle pot wiper voltage too high.
42
Throttle Wiper Low
Shutdown Throttle.
1. See Monitor menu Inputs: Throttle Pot.
2. Throttle pot wiper voltage too low.
43
Pot2 Wiper High
Full Brake.
1. See Monitor menu Inputs: Pot2 Raw.
2. Pot2 wiper voltage too high.
44
Pot2 Wiper Low
Full Brake.
1. See Monitor menu Inputs: Pot2 Raw.
2. Pot2 wiper voltage too low.
