User’s Manual
39
This can also mean that the regen is too small to handle the braking
requirements. Make sure the regen is not operating in the current limit during
braking.
This fault may occur if the regen is connected to multiple drives, with blocking
diodes between each drive ant the regen. This topology is not supported.
Please contact Bonitron for possible alternative common bus solutions.
5.3.8. DIFFERENTIAL OVERVOLTAGE
Differential overvoltage can be caused by the same reasons as the DC
overvoltage. Refer to Section 5.3.7.
5.3.9. SYNC LOSS
Ensure that the overcurrent devices on the incoming AC line are intact.
Ensure that the AC source is properly sized for the application. "Soft" or high
impedance sources can have significant voltage distortion that can cause the
regen to lose sync. Most drives will not be affected by this distortion. You
can check for voltage distortion on the incoming AC line with an oscilloscope
with appropriate leads. It will be important to be watching the AC line when
the Sync Loss fault occurs, as the distortion may not be on the line all the
time, especially when it is not loaded.
If a sync loss fault is listed in the fault log in conjunction with a Precharge Not
Complete fault, this indicates that control power to the unit has been reset.
No actual sync loss condition has occurred.
5.3.10. IGBT DRIVER
This fault can be reset the M3645 by toggling the Enable input. (4.5.2)
If the fault cannot be cleared, or occurs frequently, the unit may be damaged.
Contact Bonitron for assistance.
If two M3645 units are operated in parallel, IGBT faults may indicate that the
parallel combination is undersized for the application.
5.3.11. PHASE OVERCURRENT
This fault can be cleared by toggling the enable input. (4.5.2)
If it occurs frequently, there may be a voltage imbalance on the incoming AC
line. Ensure that the incoming line voltages are within 3% of each other.
5.3.12. PHASE LOSS
This fault typically means that the incoming power overcurrent devices or
fuses are blown.
Power the regen down and check all fuses and that AC voltage is present at
the terminals of the regen.
5.3.13. DC UNDERVOLTAGE
This may indicate that overcurrent devices in the DC link may have opened.
Check the AC and DC voltages with an external voltmeter and make sure
they are within specification.
If the voltages are correct, and the fault will not clear, contact Bonitron for
assistance.
5.3.14. REGEN POWER-ON/PRECHARGE NOT COMPLETE
This fault is expected to occur every time the unit powers on. It should clear
automatically within ten seconds.
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