Power-Related Fault Resolution - Rockwell Automation MagneMotion MagneMover LITE Original Instructions Manual

Operation
Theory of Operation
Protocol User Manual, MMI-UM004). This fault self-clears when the internal propulsion bus
voltage rises above +28V DC.
If the internal propulsion bus voltage drops below +27V DC during operation, the motor
reports an undervoltage fault through the HLC to the host controller. When this fault is
reported, all inverters within the motor are disabled, and any vehicles in motion over the
motor are no longer be under active control and as such their motion is undefined. Normal
operation resumes once the internal propulsion bus rises back up to +28V DC.
This fault is likely due to excessive +36V DC power cable and 36V DC return cable resis-
tance from the power source to the motor.
Overvoltage Fault
When the internal propulsion bus in the motor rises above +42V DC, the motor reports an
overvoltage fault to the HLC. The HLC reports this fault to the host controller as an overvolt-
age fault (see either the Host Controller TCP/IP Communication Protocol User Manual,
MMI-UM003, or the Host Controller EtherNet/IP Communication Protocol User Manual,
MMI-UM004). When this fault is reported, all inverters within the motor are disabled, and
any vehicles in motion over the motor are no longer under active control and as such their
motion is undefined. This fault self-clears and normal operations resume once the internal
propulsion bus voltage falls below +38V DC. To avoid issuing an overvoltage fault to the host
controller due to spurious noise, the internal propulsion bus that is used to trigger this event is
filtered.

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 between +28...42V 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 common +36V DC power
supply if a voltage drop in these cables leads to under voltage on motors accelerating
vehicles.
• Reduce the cable resistance between the power supply and the motors if a voltage drop
in these cables leads to under voltage on motors accelerating vehicles.
• Reduce the maximum speeds and/or maximum accelerations to reduce the amount of
power that is drawn.
• Reduce the number of vehicles accelerating on motors that are connected to the same
common +36V DC power supply.
• Split the power bus into smaller sections and install additional power supplies.
• Increase the spacing between vehicles on motors sharing a common +36V DC power
supply to minimize the load on the power supply.
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Rockwell Automation Publication MMI-UM002F-EN-P - October 2022
MagneMotion