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302 HVAC Drive H300
Issue Number: 3
OI Brake Braking IGBT over current detected: short circuit protection for the braking IGBT activated
4
The OI Brake trip indicates that over current has been detected in braking IGBT or braking IGBT protection has been
activated. This trip cannot be reset until 10 s after the trip was initiated.
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. The table below
shows where the trip has been detected..This trip cannot be reset until 10 s after the trip was initiated.
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 Snubber Snubber over-current detected
92
The OI Snubber trip indicates that an over-current condition has been detected in the rectifier snubber circuit. The reason
for the trip can be identified by the sub-trip number.
* For a parallel power-module system the rectifier number will be one as it is not possible to determine which rectifier has
detected the fault.
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 an insulation tester
• Fit an output line reactor or sinusoidal filter
Option Disable Option module does not acknowledge during drive mode changeover
215
During drive mode changeover option modules must acknowledge that they have stopped accessing the communications
system between the option slots and the drive. If an option module does not do this in the allowed time then this trip is
produced.
Recommended trip:
• Reset the trip
• If the trip persists replace the option module
Trip Diagnosis
Source xx y zz Description
Power
system
Power
module
number
0 00 Braking IGBT instantaneous over-current trip
Source xx y zz
Control system 00 0 00
Power system Power module number 0 00
Source xx y zz Description
Power
system
01
Rectifier
number*
00 Rectifier snubber over-current trip detected.
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