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ATV600/900 SCF1 Motor short circuit fault guide
Details on SCF1:
Motor short circuit fault (hard detection)
Principle
The drive is protected against short circuit between the phase output and phase and phase to the ground.
When there is a short circuit, the inverter indicates the fault message SCF1.
It is a very quick (a few μs) hardware detection, the threshold is about 3 to 4 times of the nominal current of the inverter.
Probable causes
• There is a short circuit at the inverter output.
• Short circuit or earth fault in the motor or motor cable.
• Earth fault.
Remedies
•  perform the diagnostic functions on the HMI, or SoMove service section.
•  check the cables connecting the drive to the motor and the motor insulation.

Suggested methods: Please keep photo of the result of each step and prepare to share.
1. Check the cables connecting the drive to the motor, and the motor’s insulation
Using a 1,000V Megger, test the motor and leads
2. Check for tight wiring connections
3. Perform the Transistor test via the [DIAGNOSTICS] menu with the motor connected.​
[Complete settings] [Maintenance] [Diagnostics]
​Run [IGBT Diag w motor] IWT
4. Run the drive open circuit (with the motor disconnected, OPL turned off, and Motor Control Type set to V/F 5pts)
[Complete settings] [Error/Warning handling] [Output phase loss] -> set to 'No'
[Complete settings] [Motor parameters] -> set to 'V/F 5pts'
and check the drive's output (T) terminals for balanced voltages phase to phase
Run [IGBT Diag w/o motor] IWOT
5. Perform a diode check using terminals U/T1, W/T2, V/T3, PA+ and PC-.
NOTE: This step should be performed when no line voltage is present on the drive. Power down the drive before performing this step.
-Measure (using your meter's diode diode scale) in one direction, then swap your leads and measure again
Measure between PA+ to T1, T2, and T3.  Then swap leads and test again.
Next measure between PC- to T1,T2,T3 and then swap leads.  (total of 12 measurements: 6 measurements to PA+ and 6 measurements to PC-)
-You should see 'OL' in one direction and a small voltage reading (approximately 0.3-.0.5V) in the other direction and each set of measurements should be consistent between phases.
-Values outside the acceptable range can indicate damage to the IGBT's or other components in the drive.

diode check

Schneider Electric New Zealand

ATV600/900 SCF1 Motor short circuit fault guide
Details on SCF1:
Motor short circuit fault (hard detection)
Principle
The drive is protected against short circuit between the phase output and phase and phase to the ground.
When there is a short circuit, the inverter indicates the fault message SCF1.
It is a very quick (a few μs) hardware detection, the threshold is about 3 to 4 times of the nominal current of the inverter.
Probable causes
• There is a short circuit at the inverter output.
• Short circuit or earth fault in the motor or motor cable.
• Earth fault.
Remedies
•  perform the diagnostic functions on the HMI, or SoMove service section.
•  check the cables connecting the drive to the motor and the motor insulation.
 
Suggested methods: Please keep photo of the result of each step and prepare to share.
1. Check the cables connecting the drive to the motor, and the motor’s insulation
Using a 1,000V Megger, test the motor and leads
2. Check for tight wiring connections
3. Perform the Transistor test via the [DIAGNOSTICS] menu with the motor connected.​
[Complete settings] [Maintenance] [Diagnostics]
​Run [IGBT Diag w motor] IWT
4. Run the drive open circuit (with the motor disconnected, OPL turned off, and Motor Control Type set to V/F 5pts)
[Complete settings] [Error/Warning handling] [Output phase loss] -> set to 'No' 
[Complete settings] [Motor parameters] -> set to 'V/F 5pts'
and check the drive's output (T) terminals for balanced voltages phase to phase
Run [IGBT Diag w/o motor] IWOT
5. Perform a diode check using terminals U/T1, W/T2, V/T3, PA+ and PC-. 
NOTE: This step should be performed when no line voltage is present on the drive. Power down the drive before performing this step. 
-Measure (using your meter's diode diode scale) in one direction, then swap your leads and measure again
Measure between PA+ to T1, T2, and T3.  Then swap leads and test again. 
Next measure between PC- to T1,T2,T3 and then swap leads.  (total of 12 measurements: 6 measurements to PA+ and 6 measurements to PC-)
-You should see 'OL' in one direction and a small voltage reading (approximately 0.3-.0.5V) in the other direction and each set of measurements should be consistent between phases.
-Values outside the acceptable range can indicate damage to the IGBT's or other components in the drive.

diode check
 
 

Schneider Electric New Zealand

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