Operation
Theory of Operation
248 MagneMotion
Rockwell Automation Publication MMI-UM007F-EN-P - September 2020
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 +458–747V DC
power supply if a voltage drop in these cables leads to under voltage on motors accel-
erating vehicles or excessive voltage on motors 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 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
common +458–747V 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 +458–747V DC
power supply to increase the number of blocks available to absorb power during
regeneration.
• Connect more motors to a common +458–747V 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 +458–747V 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 +805V DC, which is the
point where the inverter starts to dump energy to empty blocks.
To Next Page
Loading...
Need help?
General
