Rockwell Automation 1302 575v AC Drive - Canada Only - Manual (Page 81)

9–3 Troubleshooting
Publication 1302-5.0 — January, 1998
= HIGH BUS VOLTAGE
The DC bus is charged above the electronic trip threshold. Note that the fault will not clear until the bus falls
below the high bus level.
Possible Cause Corrective Action
The deceleration rate setting in FĆ02 is too fast. Decrease the deceleration rate in FĆ02. Refer to
chapter 8 for the FĆ02 parameter description.
Install the optional snubber resistor braking kit.
The Drive was started into a forwardĆrunning load
that has a high inertia.
Install the optional snubber resistor braking kit.
High input line. Verify that the AC input is within specification. Install
an isolation transformer if required.
= LOW BUS VOLTAGE
The DC bus voltage has fallen below the electronic trip low threshold level. Note that the fault will not clear
until the linput line voltage is within the proper range. This may take a few seconds.
Important: If a line dip or momentary power loss occurs and the DC bus is able to rise back to the proper
level within 500 ms, the Drive will automatically restart (if the Drive was running when the fault
occurred).
Possible Cause Corrective Action
Loss of input power. Check incoming power.
Low line voltage. Check incoming power. Install an isolation
transformer if required.