Understanding trip codes is an important part of keeping your equipment running smoothly. Below are some of the more common codes you may come across:
|Trip Code||Condition||Possible Cause|
|UU||DC Bus under voltage||Low AC Supply Voltage
Low DC Bus voltage when supplied by an external DC power supply
|OU||DC Bus over voltage||Deceleration rate set too fast for the inertia of the machine
Mechanical load driving the motor
|OI.AC**||Drive output instantaneous over current||Insufficient ramp times
Phase to phase or phase to ground short circuit on the drives output
Drive requires autotuning to the motor
Motor or motor connections changed, re-autotune drive to motor
|OI.br**||Braking Resistor instantaneous over current||Excessive current in braking resistor
Braking resistor value to small
|O.SPd||Over Speed||Excessive motor speed (typically caused by a mechanical load driving the motor|
|tunE||Autotune stopped before completion||Run command removed before autotune compelte|
|It.br||I2t on Braking Resistor||Excessive braking resistor energy|
|lt.AC||l2t on drive output current||Excessive Mechanical load
High impedance phase to phase or phase to ground short circuit at drive output
Drive requires re-autotuning to motor
|O.ht1||IGBT over heat based on dries thermal model||Over heat software thermal module|
|O.ht2||Over heat based on drives heatsink||Heatsink temperature exceeds maximum allowable|
|th||Motor thermistor trip||Excessive motor temperature|
|O.Ld1*||User +24v or digital output overload||Excessive load or short circuit on +24v output|
|cL1||Analogue input 1 current mode, current loss||Input current less than 3mA when 4-20 or 20-4mA modes selected|
|SCL||Serial communication loss time-out||Loss of communication when drive is under remote control|
|EEF||Internal Drive EEPROM trip||Possible loss of parameter values|
|PH||Input phase imbalance or input phase loss||One of the input phases has become disconnected from the drive (applies to 200/400v three phase drives only, not dual rated drives.|
|rS||Failure to measure motors stator resistance||Motor too small for drive
Motor cable disconnected during measurement
|C.Err||SmartStick data error||Bad connection or memory corrupt within SmartStick|
|C.dAt||SmartStick data does not exist||New/empty SmartStick being read|
|C.Acc||SmartStick read/write error fail||Bad connection or faulty SmartStick|
|C.rtg||SmartStick/drive rating change||Already programmed SmartStick read by a drive of a different rating|
|O.cL||Overload on current loop input||Input current exceeds 25mA|
|HFxx trip||Hardware faults||Internal drive hardware fault|
* The Enable/Reset terminal will not reset an O.Ld1 trip. Use the Stop/Reset key
**These trips cannot be reset for 10 seconds after they occur
If you have an AC / DC drive module breakdown or stability issue our engineers are able to analyse the whole machine to identify where the control issues lie. Our extensive experience in retrofit and new projects means we have the knowledge to look deep into the control system where we commonly find the peripheral devices are faulty rather than the drive module.
Where appropriate we are often able to offer technical support by phone, we will need the following information from you:
- Your official Purchase order (this must be received prior to any support).
- Details of the Drive.
- Error Codes.
- We may also need copies of drawings and software to aid diagnosis.
Telephone support rates are £100.00 per hour, with a minimum charge of 1 hour.
Our team of engineers are also able to offer on site service and breakdown support throughout the UK to get you up and running again quickly, please enquire for details.
If you have a faulty drive but don't require on site support, Drives and Automation are able to repair them at our repair center in Telford. Our trained engineers will strip down your drive and send you a repair quotation. If you are happy to proceed we will repair the drive, clean it and load test it before returning it to you. Fast turnarounds are usually no problem!
The Commander SK is now a superceded product and is in it's maintenance period. Volume production of these products has now ceased, but manufacturer contractual obligations regarding warranty, service and repairs will continue. The maintenance period is expected to last up to ten years subject to raw material and component availability and will end in 2027 when no further manufacturer support will be available. Drives and Automation are able to supply refurbished units for certain models, simply contact us with details of your existing Commander SK and we will see if we can offer you a replacement.
In 2013, the Unidrive SP and Commander SK were replaced by a new range of industrial AC drives called Unidrive M. Unidrive M’s design is based on the success and popularity of Unidrive SP and Commander SK, and incorporates market-leading technologies. If you are wanting to upgrade your obsolete Commander SK to an M Series Drive, use our quick reference guide to choose the right replacement Drive for your application: