HF04- Low DC bus at power up- may indicate an AC Input or pre-charge problem
HF05- No internal handshake signal from second processor (DSP) at start up
HF06- Unexpected interrupt
HF07- Watchdog failure
HF08- Interrupt crash (code overrun)
HF11- Access to the EEPROM failed- tried to read stored parameter data but failed
HF20- Power stage – code error Tried to read power board and read back erroneous
HF21- Power stage – unrecognized frame size
HF22- Overcurrent detection at power up- possible output short or bridge failure
HF23- DSP software overrun
HF25- DSP Communications failure- communication from main to 2nd processor
HF26- Soft start relay failed to close; or soft start monitor failed; or braking
IGBT short circuit at power up
HF27- Power stage thermistor fault
HF28- Power circuit thermistor 2 or 3 fault Internal fan fault on size 3 only
HF29- Fan failure (current too high – only on drives with a fan)
HF31- Internal Cap Bank Fan failure- check for fan rotation/blockage Size 4 and up
HF32- Power circuit temperature feedback multiplexer failure
Additional Hardware Fault Code Information
HF04 – A low DC bus voltage was detected.
HF05 – The Digital Signal Processor (DSP) failed to produce any signal at
HF06, HF07, HF08 – While the user code is running, it is continuously checking
that the data it is receiving is valid etc. If it detects a problem, it will trip on one of
the trips codes HF06, HF07 or HF08.
HF11 – All communication attempts to the EEPROM are denied.
HF20 – A fault was detected on the power board as the Drive was powered up.
HF21 – The DSP reads a voltage from the power PCB to determine the correct
Drive kW size. If the voltage is different to an expected value, the Drive will trip.
HF22 – If the drive detects an OI – overcurrent trip on power up, the Drive will trip
on HF22 and not OI. Remove drive enable (B4) and motor leads and re-try.
HF23 – The user interface code (DSP based) run on different priority levels and
each level has a certain time to complete its tasks. If for some reason the code
cannot complete its task within the allotted time the Drive trip.
HF25 – A failure of communications between the DSP and control PCB
HF26 – There is a critical problem of the inrush circuit of the power board.
HF27 – The thermistor has failed or has measured a value out of tolerance.
HF28 – Power circuit thermistor 2 or 3 fault - Internal fan fault on Size 3 only
DSP- is Digital Signal Processor - 2nd processor running in conjunction with the main drive processor.
HF29 – If the SK is fitted with a heatsink fan then it is failing and drawing
HF29 is typically an indication that the cooling fans at the bottom of the Drive are
not spinning. With power off and Drive discharged, one should check into the fan
area to check for foreign debris to see that the Fan(s) can spin freely.
HF30 – DCCT wire break trip from power module
HF31 – Aux fan failure from power module- internal Cap bank fan – Size 4 and up
HF32 – Power circuit temperature feedback multiplexer failure