Control TechniquesFault codes
Unidrive SP fault codes
Every trip the Control Techniques Unidrive SP can display, listed by the trip number shown in parameter 10.20, with what each one means. Taken from the Unidrive SP Advanced User Guide.
Unidrive SP trip table
Listed by the trip number shown in parameter 10.20, so you can cross-reference the drive over serial or from the keypad. Grouped rows cover the user-defined trip ranges and the hardware trips, which carry no trip number.
| Trip no. | Display | Meaning |
|---|---|---|
| Main drive trips | ||
| 1 | UV | DC bus undervoltage. Self-resetting when the bus rises above the restart level — 330 V trip and 425 V reset on a 400 V drive |
| 2 | OV | DC bus overvoltage — peak level exceeded, or above the maximum continuous level for 15 seconds. Deceleration too fast, braking resistor open, or a regenerative load |
| 3 | OI.AC | Instantaneous output overcurrent: peak output current above 222% of rating — output short, motor insulation, or IGBT failure |
| 4 | OI.br | Braking IGBT instantaneous overcurrent — fault in the braking resistor circuit |
| 5 | PS | Internal power supply fault on the drive |
| 6 | Et | External trip from a digital input on terminal 31 |
| 7 | O.SPd | Motor speed has exceeded the overspeed threshold |
| 8 | PS.10V | 10V user power supply overload on the control terminals |
| 9 | PS.24V | 24V user power supply overload on the control terminals |
| 10 | br.th | Braking resistor over temperature from the hardware thermal monitoring |
| 11 – 18 | tunE1 – tunE | Autotune and mechanical load measurement failures — the sub-trip identifies the stage that failed |
| 19 | It.br | Braking resistor I²t overload — accumulator value in Pr 10.39 |
| 20 | It.AC | Output current I²t overload — accumulator value in Pr 4.19 |
| 21 | O.ht1 | Power device over temperature from the software thermal model |
| 22 | O.ht2 | Heatsink over temperature from the measured heatsink sensor |
| 23 | O.CtL | Control board over temperature |
| 24 | th | Motor thermistor trip |
| 25 | thS | Motor thermistor short circuit |
| 26 | O.Ld1 | Digital output overload — total current from the 24V supply and digital outputs above 200 mA |
| 27 | O.ht3 | Drive over temperature from the thermal model — the drive stops the motor before tripping |
| 28 | cL2 | Analogue input 2 current loss in current mode |
| 29 | cL3 | Analogue input 3 current loss in current mode |
| 30 | SCL | RS485 serial comms loss to the remote keypad |
| 31 | EEF | EEPROM checksum failure — defaults loaded, cannot be reset until a load-defaults code is entered |
| 32 | PH | AC input phase loss or large supply imbalance, detected from DC bus ripple |
| 33 | rS | Failure to measure motor resistance during autotune, or when starting in open loop vector mode 0 or 3 |
| 34 | PAd | Keypad removed while the drive is taking its speed reference from the keypad |
| 35 | CL.bit | Trip initiated from the control word, Pr 6.42 |
| 36 | SAVE.Er | User save parameters in the EEPROM are corrupt |
| 37 | PSAVE.Er | Power-down save parameters in the EEPROM are corrupt |
| 38 | t038 | User defined trip — raised by the onboard PLC or an option module |
| 39 | L.SYnC | Drive failed to synchronise to the supply voltage in Regen mode |
| 40 – 89 | t040 – t089 | User defined trips, raised from the onboard PLC or an option module program |
| Onboard PLC trips | ||
| 90 – 98 | UP div0 – UP ACC | Onboard PLC program errors: divide by zero, non-existent parameter, write to a read-only parameter, read of a write-only parameter, out-of-range write, overflow, requested trip, undefined trip, or program file inaccessible |
| 99, 101 | t099, t101 | User defined trips |
| Power module trips | ||
| 102 – 110 | Oht4.P – Unid.P | Power module trips: rectifier over temperature, braking IGBT overcurrent, output overcurrent, heatsink over temperature, overvoltage, phase loss, power supply failure, IGBT on-state overcurrent, and unidentified module trip |
| 111 | ConF.P | The number of power modules installed no longer matches the value stored in Pr 11.35 |
| 112 – 160 | t112 – t160 | User defined trips |
| Feedback and SMARTCARD trips | ||
| 161 – 167 | Enc11 – Enc17 | Encoder auto-configuration and comms trips for SINCOS, Hiperface and EnDat feedback devices |
| 168 – 174 | t168 – t174 | User defined trips |
| 175 – 187 | C.Prod – C.TyP | SMARTCARD trips: data blocks not compatible with this product, electronic nameplate error, boot error, card busy, data location occupied, option modules differ, read-only card, corrupted data, empty location, card full, read/write fail, rating mismatch, parameter set not compatible |
| 188 | C.cPr | SMARTCARD data is not compatible with this drive |
| 189 – 196 | EnC1 – EnC8 | Drive encoder trips: power supply overload, wire break, phase offset incorrect while running, comms failure, checksum or CRC error, encoder reported error, initialisation failed, auto-configuration failed |
| 199 | dESt | Two or more parameters are writing to the same destination parameter |
| 200 – 204 | SL1.HF – SL1.dF | Solutions Module in slot 1: hardware fault, watchdog failure, module detected fault, module removed, module changed |
| 205 – 209 | SL2.* | Solutions Module in slot 2 — same set of trips as slot 1 |
| 210 – 214 | SL3.* | Solutions Module in slot 3 — same set of trips as slot 1 |
| 215, 216 | SL.rtd, t216 | Solutions Module rating trip, and a user defined trip |
| 217 – 232 | HF17 – HF32 | Hardware trips: multi-module thermistor and interconnect faults, temperature feedback multiplexing, power stage recognition and serial code errors, current feedback offset, power stage and control board thermistors, DCCT wire break |
| Hardware trips | ||
| — | HF01 – HF16 | Control board hardware faults — CPU, memory, bus, watchdog and stack failures. No trip number and cannot be reset; the drive needs replacing or the control board repairing |
Trip strings vary slightly with software version. If your display shows something not listed here, send us a photo of the keypad and we will identify it.
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Unidrive SP tripping?
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