152 Troubleshooting, Diagnoses and Maintenance CG Drives & Automation 01-7318-01r1
* = 2...6 Module number if parallel power units (size 300–1500 A)
GCP F<<
Monitored grid frequency is lower than the
corresponding trip level setting.
- Check if the trip level settings are realistic.
- Check the mains supply wiring.
- Check the connection wiring of supply voltage
measurement board.
- Check the drive nominal settings are according to the
connected supply/grid.
GCP ROCOF
Monitored rate of change of grid frequency is
higher than the corresponding trip level set-
ting.
- Check if the trip level settings are realistic.
- Check the mains supply wiring.
- Check the connection wiring of supply voltage
measurement board.
- Check the drive nominal settings are according to the
connected supply/grid.
- Check if supply/grid is stable
UVRT
UVRT trip, i.e. trip area (1 or 2) has been
reached.
- Check the mains grid supply is within the acceptable
operation range of AFR/AFG.
- Check the mains supply wiring.
- Check the connection wiring of supply voltage meas-
urement board.
- Check the drive nominal settings are according to the
connected supply/grid.
OVRT
OVRT trip, i.e. trip area (1 or 2) has been
reached.
- Check the mains grid supply is within the acceptable
operation range of AFR/AFG.
- Check the mains supply wiring.
- Check the connection wiring of supply voltage meas-
urement board.
- Check the drive nominal settings are according to the
connected supply/grid.
Passive AID AID trip from passive detection.
- Check the mains cable connection of AFR/AFG to grid
is proper.
- Check the mains grid supply is within the acceptable
operation range of AFR/AFG.
Active AID AID trip from active detection.
- Check the mains cable connection of AFR/AFG to grid
is proper.
- Check the mains grid supply is within the acceptable
operation range of AFR/AFG.
Resistor Err Brake resistor protection trip. - Contact authorized service team.
Open CB Open circuit detected
- An open main circuit breaker, possibly triggered by
relay protection on the primary side (medium voltage
side) of the plant transformer. Check if the main circuit
breaker is opened.
Rect I Error
AFR/AFG cannot be started as the DC-link is
already loaded. This protection is active when
supply voltage measurement board is not
used.
- Check if there is a load connected to the DC-link of
AFR/AFG.
PLL Not Lock
AFR/AFG is waiting for the PLL to be locked
(PLL not ready yet).
- Check setup (AnIn settings) for SVMB is correct.
- Check supply (power) wires are connected properly to
SVMB.
- Check the supply sequence to AFR/AFG and to SVMB
is same.
- Wait for the PLL to be locked.
NOTE:
For VSI refer to the Instruction manual for Emotron FDU/
VFX.
Table 29 Trip condition, their possible causes and remedial action
Trip condition Possible Cause Remedy
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