282 Rockwell Automation Publication 2198-UM002G-EN-P - February 2019
Chapter 7 Troubleshoot the Kinetix 5700 Drive System
Bus overvoltage on other converters sharing
AC input with the regenerative bus supply as
soon as DC-bus regulation is enabled.
Common mode current from regenerative bus supply interacting
with common-mode filter capacitors in non-Kinetix 5700 drives.
Remove AC line filter or ground jumper from other non-Kinetix 5700 drives sharing
the AC input with the regenerative bus supply. Additionally, properly sized input
reactors can help reduce DC-bus pump-up on non-Kinetix 5700 drives.
Input overcurrent or ground current fault on
non-Kinetix 5700 drives connected to the
regenerative bus supply as soon as DC-bus
regulation is enabled.
Single-axis inverters (catalog numbers 2198-S086-ERSx, 2198-
S130-ERSx, 2198-S160-ERSx) firmware 10.3 or later is required.
Update the single-axis inverter firmware (catalog numbers 2198-S086-ERSx,
2198-S130-ERSx, 2198-S160-ERSx).
Motor insulation breakdown. Replace the motor.
DC bus voltage remains low (<50V) after the
AC contactor closes and AC is present at the
input to the regenerative bus supply.
DC-bus short circuit. Find and resolve the DC-bus short circuit.
Inverter internal short circuit.
• Test regenerative bus supply with all inverters disconnected
• Replace the shorted inverter
Inverter ground jumpers installed. Remove inverter ground jumpers.
Actual DC bus voltage is not equal to the DC
voltage set point in the Logix Designer
application.
DC voltage set point too high. Set the DC-bus voltage set point to a value <747V or use automatic mode.
DC voltage set point too low.
Set the DC-bus voltage to a value > (input AC voltage rms • 1.414 • 1.05) or use
automatic mode.
Startup draws excessive current from the AC
input on DC-bus voltage regulation enable.
External bus capacitance entered incorrectly in the Logix
Designer application.
Enter the sum of all bus capacitance external to the regenerative bus supply into
the Logix Designer application. See Calculate System and External-bus Capacitance
on page 394
to calculate external bus capacitance.
Voltage rate limit set too high in the Logix Designer application. Reduce the bus voltage rate limit in the Logix Designer application.
Current oscillations at no load.
Loop Response Set the loop response to medium or low.
Filter Bandwidth Increase the filter bandwidth (if lower than 4x the voltage regulator bandwidth).
Notch Frequency.
Increase the notch frequency bandwidth (if lower than 4x the voltage regulator
bandwidth).
Source kVA.
Set the source kVA to the actual kVA rating of the AC input transformer or input
reactor.
AC current is limited to less than the peak
rating of the regenerative bus supply.
Source kVA set too low.
Current loop vector limit set too low. Set the current loop vector limit back to the default.
AC contactor won’t close.
Stuck in configuring.
Check for messages on quick view pane of the controller organizer in the Logix
Designer application.
Contactor enable unplugged. Plug in the contactor enable.
AC contactor coil failure. Replace contactor.
Table 130 - Regenerative Bus Supply Troubleshooting (continued)
Condition Potential Cause Possible Resolution
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