Which products are affected?
8200 vector / motec
What happens?
Provided that the 'flying circuit' function is activated the frequency inverter remains in the pulse inhibit status after a brief mains interruption.
When does the problem occur?
- If with activated flying circuit C0142 ≥ 2 and
- in the undervoltage state (LU) the supply system is reconnected and
- the controller enable is activated simultaneously to the system recovery
the inverter remains in the 'controller inhibited' state.
Possible diagnostics?
The motor is not energised despite setpoint selection and active terminal 28.
Short-term measures/recommendations?
1st possibility:
Delayed controller enable. The drive starts with flying circuit (600 ms delay time with power ranges ≤ 11 kW; 1.5 s delay time with power ranges ≥ 15 kW)
2nd possibility:
- Set parameter set 2 like parameter set 1
- Set C0988 (DC-bus voltage for DC-bus voltage control) to DC-bus undervoltage threshold as described below:
400 V AC devices (565 V DC ≈ C0988 = 100 %): Set C0988 430 V DC,
C0988 = 100 % / 565 V * 430 V = 76 %
230 V AC devices (325 V DC ≈ C0988 = 100 %): Set C0988 to 130 V DC,
C0988 = 100 % / 325 V * 130 V = 40 %
- Code C0142 = 1 flying circuit inactive (parameter set 1)
- Code C2142 = 3 flying circuit active (parameter set 2)
In case of normal DC-bus voltage the inverter always uses parameter set 2 since the DC-bus voltage is larger than C0988. The flying circuit is activated (C2142 = 3).
If the DC-bus voltage falls below the voltage threshold for the under voltage trip parameter set 1 is activated. The inactivated flying circuit in this parameter set causes the fault suppression (controller enable is identified).
Evaluation:
Uncritical, the drive does not start despite enable.
