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130 Unidrive M100 User Guide
Issue Number: 1
OI.br Braking IGBT over current detected: short circuit protection for the braking IGBT activated
4
The OI.br trip indicates that over current has been detected in braking IGBT or braking IGBT protection has been activated.
Recommended actions:
• Check brake resistor wiring
• Check braking resistor value is greater than or equal to the minimum resistance value
• Check braking resistor insulation
OI.dC Power module over current detected from IGBT on state voltage monitoring
109
The OI.dC trip indicates that the short circuit protection for the drive output stage has been activated.
Recommended actions:
• Disconnect the motor cable at the drive end and check the motor and cable insulation with an insulation tester
• Replace the drive
OI.Sn Snubber over-current detected
92
This trip indicates that an over-current condition has been detected in the rectifier snubbing circuit, The exact cause of the
trip can be identified by the sub-trip number.
Recommended actions:
• Ensure the internal EMC filter is installed.
• Ensure the motor cable length does not exceed the maximum for selected switching frequency.
• Check for supply voltage imbalance.
• Check for supply disturbance such as notching from a DC drive.
• Check the motor and motor cable insulation with a Megger.
Fit an output line reactor or sinusoidal filter.
o.1.Sc Output U phase short-circuit
228
Over-current detected on drive output when enabled. Possible motor ground fault.
Recommended actions:
• Check for short circuit on the output cabling
• Check integrity of the motor insulation using an insulation tester
• Is the motor cable length within limits for the frame size?
o.2.Sc Output V phase short-circuit
229
Over-current detected on drive output when enabled. Possible motor ground fault.
Recommended actions:
• Check for short circuit on the output cabling
• Check integrity of the motor insulation using an insulation tester
• Is the motor cable length within limits for the frame size?
o.3.Sc Output W phase short-circuit
230
Over-current detected on drive output when enabled. Possible motor ground fault.
Recommended actions:
• Check for short circuit on the output cabling
• Check integrity of the motor insulation using an insulation tester
• Is the motor cable length within limits for the frame size?
Out.P Output phase loss detected
98
The Out.P trip indicates that a phase loss has been detected at the drive output. If Output Phase Loss Detection Enable
(06.059) = 1 then output phase loss is detected as follows:
1. When the drive is enabled short pulses are applied to make sure each output phase is connected.
2. During running the output current is monitored and the output phase loss condition is detected if the current contains
more than TBD % negative phase sequence current for TBDs.
Recommended action:
• Check motor and drive connections
• To disable the trip set Output Phase Loss Detection Enable (06.059) = 0
Trip Diagnosis
Source xx y zz Description
Power
system
01 0 00 Braking IGBT instantaneous over-current trip
Source xx y zz
Power system 01 1 00: Rectifier snubber over-current trip detected