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Operation
Theory of Operation
QuickStick HT User Manual
245
Rockwell Automation Publication MMI-UM007F-EN-P - September 2020
Hardware Overcurrent Fault
When a Hardware Overcurrent Warning fails to clear, the HLC reports this fault to the host
controller as a Hardware Overcurrent Fault (see either the
Host Controller TCP/IP Communi-
cation Protocol User Manual
Host Controller EtherNet/IP Communica-
tion Protocol User Manual
). Once this fault is reported, the motor controller
must be reset.
Power-Related Fault Resolution
The power-related error messages and the associated faults persist until the voltage of the
internal propulsion bus in the motor is b250V and +430V DC. Once the voltage is
within the operating range, the system attempts to resume active control of the vehicle. There
are several possible solutions available to mitigate faults of these types.
•
Reduce the cable resistance between motors that share a 300–400V DC
power supply if a voltage drop in these cables leads to under voltage on motors that are
accelerating vehicles or excessive voltage on motors that are undergoing regeneration.
•
Reduce the cable resistance between the power supply and the motors if a voltage drop
in these cables leads to under voltage on motors that are accelerating vehicles.
•
Reduce the maximum speeds and/or maximum accelerations to reduce the amount of
power that is drawn and the regenerated power flowing back into the system.
•
Reduce the number of vehicles accelerating on motors that are connected to the same
300–400V DC power supply.
•
Split the power bus into smaller sections and install additional power supplies.
•
Increase the spacing between vehicles on motors sharing a 300–400V DC
power supply to increase the number of blocks available to absorb power during
regeneration.
•
Connect more motors to a 300–400V DC power supply to increase the
number of blocks available to absorb regenerated power.
If all of these resolution paths have been explored and excessive voltage problems still persist,
add an active voltage clamp across the +300–400V DC power supply local to the power sup-
ply or to the motors that are exhibiting this issue. The clamping voltage can be set above the
expected operating voltage, but should not be set any higher than +420V DC, which is the
point where the motor controller starts to dump energy to empty blocks.