PRESTO OWNER’S MANUAL
Page 17
POWER STAK
22
Controller Overtemp Cutback
Reduced drive and brake torque.
1. See Monitor menu Controller: Temperature.
2. Controller is performance-limited at this temperature.
3. Controller is operating in an extreme environment.
4. Excessive load on vehicle.
5. Improper mounting of controller.
23
Undervoltage Cutback
Reduced drive torque.
1. Normal operation. Fault shows that the batteries need recharging. Con
-
troller is performance limited at this voltage.
2. Battery parameters are misadjusted.
3. Non-controller system drain on battery.
4. Battery resistance too high.
5. Battery disconnected while driving.
6. See Monitor menu Battery: Capacitor Voltage.
7. Blown B+ fuse or main contactor did not close.
24
Overvoltage Cutback
Reduced brake torque.
1. Normal operation. Fault shows that regen braking currents elevated the
battery voltage during regen braking. Controller is performance limited at
this voltage.
2. Battery parameters are misadjusted.
3. Battery resistance too high for given regen current.
4. Battery disconnected while regen braking.
5. See Monitor menu Battery: Capacitor Voltage.
25
+5V Supply Failure
None, unless a fault action is pro-
grammed in VCL.
1. External load impedance on the +5V supply (pin 26) is too low.
2. See Monitor menu outputs: 5 Volts and Ext Supply Current.
26
Digital Out 6 Overcurrent
Digital Output 6 driver will not
turn on.
1. External load impedance on Digital Output 6 driver (pin 19) is too low.
27
Digital Out 7 Overcurrent
Digital Output 7 driver will not
turn on.
1. External load impedance on Digital Output 7 driver (pin 20) is too low.
28
Motor Temp Hot Cutback
Reduced drive torque.
1. Motor temperature is at or above the programmed Temperature Hot set
-
ting, and the requested current is being cut back.
2. Motor Temperature Control Menu parameters are mis-tuned.
3. See Monitor menu Motor: Temperature and Inputs: Analog2.
4. If the application doesn't use a motor thermistor, Temp Compensation
and Temp Cutback should be programmed Off.
29
Motor Temp Sensor Fault
MaxSpeed reduced (LOS, Limited
Operating Strategy), and motor
temperature cutback disabled.
1. Motor thermistor is not connected properly.
2. If the application doesn't use a motor themistor, Motor Temp Sensor En
-
able should be programmed Off.
3. See Monitor menu Motor: Temperature and Inputs: Analog2.
31
Coil1 Driver Open/Short
Shutdown Driver1.
1. Open or short on driver load.
2. Dirty connector pins.
3. Bad crimps or faulty wiring.
31
Main Open/Short
Shutdown Motor;
Shutdown Main Contactor;
Shutdown EM Brake;
Shutdown Throttle;
Full Brake;
Shutdown Pump.
1. Open or short on driver load.
2. Dirty connector pins.
3. Bad crimps or faulty wiring.
