Browse
Our Products
AC and DC Drive Modules
Braking Resistors
Motors
Encoders
Softstarts
Energy Saving
Control System Design and Build
Case Studies
Drive Cubicles
Drive Systems
Services
Repairs
Service/Breakdown
Retro Fit
Custom Design
Send an Enquiry
About Us
Careers
Contact Us
Strategic Associations
Useful Info
IP Rating
Members
Distributors
Development
~
Site Map
Terms and Conditions

HF Trip Codes

Unidrive Classic HF Trip Codes

Below is useful information regarding Unidrive Classic HF Trip codes

These codes pertain to all Unidrive Classic models: -

HF81 Software Error (odd address word)

HF82 Large Option Module Missing

HF83 Power Board Code Failure

HF84 Current Offset Trim Failure

HF85 A to D failure (ES-CC step)

HF86 Interrupt Watchdog failure

HF87 Internal ROM check error

HF88 Watchdog Failure

HF89 Unused Interrupts (nmi as source)

HF90 Stack Overflow

HF91 Stack Underflow

HF92 Software Error (undefined op code)

HF93 Software Error (protection fault)

HF94 Software Error (odd address word)

HF95 Software Error (odd address instruction)

HF96 Software Error (illegal ext bus)

HF97 Level 1 Noise

HF98 Interrupt Crash

HF99 Level 1 Crash

HF Faults are not recorded in the Drive Historical Fault Log

All of the above HF trips in BLUE are typically a result of some sort of hardware failure on the UD90A control PCB. This control board is common to all Unidrive Classics.

For the HF codes in RED consult the following below: -

Hardware Faults are typically fatal. If powering down and letting the drive sit for 5 minutes before re-application of Power does not clear the HF Fault it would require drive repair.

Contact us for repairs

HF82 Large option module missing

The trip would be expected if one of the UD7x large option modules is removed while the Drive is powered up. If this trip occurs at any other time han the case above, then there is a problem with either the large option module or the UD90A control PCB.

HF83 Power Board Code Failure

This trip means that the UD90A control PCB could not recognize the power rating of the power PCB it is connected to. On Unidrive Sizes 1 to 4, the trip is probably due to the power PCB in the Drive but a problem with the UD90A control PCB could also cause this trip.

On a Unidrive Size 5 the trip is cause by either UD99 PCB or the UD90A PCB. The interconnects between the PCBs could also cause this trip and should be checked.

HF84 Current Offset Trim Failure

This trip means there is a problem with the current feedback on the Drive. On Unidrive Sizes 1 to 4, the trip is probably due to the power PCB in the Drive but a problem with the UD90A control PCB could also cause this trip.

On a Unidrive Size 5 the trip is cause by either UD99 PCB or the UD90A PCB. The interconnects between the PCBs could also cause this trip and should be checked.

HF88 Watchdog Failure

This trip can result from a faulty UD7x Co-Processor. With power off, remove Co-Processor and re-apply power.