Control TechniquesFault codes
Mentor II fault codes
Every trip a Control Techniques Mentor II DC drive can display, listed in numerical order with the mnemonic that flashes on the data display. Taken from section 9.1 of the Mentor II User Guide. The last four trips are held in parameters 10.25 to 10.28, so you can read them back after the drive has been reset or powered down.
Mentor II trip table
Listed in numerical order as the manual gives them, with the mnemonic shown on the data display. The last four trips are stored in parameters 10.25 to 10.28, so the history survives a power down.
| Trip no. | Display | Meaning |
|---|---|---|
| 100 | hF | Hardware fault — the self-diagnosis routine performed after power-up has detected a hardware fault. Contact the supplier of the drive |
| 101 | PhS | Phase sequence — the connections to E1 and E3 are not the same phases as those connected to L1 and L3. Check and correct the input wiring |
| 102 | Et | External trip — parameter 10.34 is set to 1, so the external trip set up by the user has operated |
| 103 | EPS | External power supply — the overcurrent trip at the 24 V supply output terminal (TB4-33) has operated, indicating an overload in the circuit connected to it. Maximum available current is 200 mA |
| 104 | cL | Current (control) loop open circuit — with a 4-20 mA or 20-4 mA reference selected, the input current is below 3.0 mA |
| 105 | ScL | Serial communications link (interface) loss — only in serial comms mode 3: no input data has been detected |
| 106 | FOC | Field overcurrent — excess current in the field current feedback. The trip occurs when current feedback is present and the firing angle is phased back |
| 107 | Oh | Overheat — thyristor (SCR) heatsink overtemperature. Only on drives equipped with heatsink thermistors (thermal switches) |
| 108 | FdO | Field on — self-tuning (05.09) has been initiated and field current has been detected |
| 109 | Fbr | Feedback reversal — the polarity of the feedback tacho or encoder is incorrect. Does not operate on 1Q drives |
| 118 | FdL | Field loss — no current in the field supply circuit |
| 119 | FbL | Feedback loss — no signal from the tachogenerator or encoder (pulse tachometer) |
| 120 | SL | Supply loss — one or more of the power input supply phases is open circuit |
| 121 | AOC | Armature overcurrent — instantaneous protection has tripped on excess current in the armature circuit |
| 122 | It | I x t trip — the integrating overload protection has reached trip level |
| 123 | th | Thermistor (thermal switch) — the motor protection thermistor has tripped, indicating winding overheating. Trip threshold 3 kΩ ±5%, reset 1.8 kΩ |
| 124 | Pc1 | Processor 1 watchdog — a fault in the MDA1 hardware has been detected by malfunctioning of the Processor 1 software |
| 125 | PS | Power supply — one or more of the internal power supplies is out of tolerance |
| 126 | AOP | Armature open circuit — the drive has detected that the firing angle has advanced but no current feedback is present |
| 131 | Pc2 | Processor 2 watchdog — a Processor 2 malfunction or a software bug (MD29 option) |
| 132 | EEF | EEprom failure — an error has been detected in the parameter set read from the EEprom at power-up |
| 40 – 69 | A29 | MD29 fault — the sub-trip number between 40 and 69 identifies the fault. Refer to the MD29 user guide |
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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