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Design Guidelines
Transport System Design
MagneMover LITE User Manual 13
Rockwell Automation Publication MMI-UM002E-EN-P - March 2016
Methods to Reduce Voltage Drop
There are two methods that can be used to reduce the drop of voltage in the system during
acceleration. The first method is to decrease the cable resistance between the power supply
and the motors by either shortening the length of the cables or increasing the conductor gauge
of the cables. This will reduce the voltage difference between the power supply and the motor.
The second method is to limit the number of motors connected to a single power supply.
Methods to Reduce Voltage Increase
There are two methods that can be used to reduce the voltage increase in the system during
deceleration. The first method is to decrease the cable resistance between motors by either
shortening the length of the cables or increasing the conductor gauge of the cables. This will
reduce the voltage difference between the motor regenerating power and the motors consum-
ing or dissipating power and allow the voltage at the regenerating motor to be lower. The sec-
ond method is to install a voltage clamp in the power supply circuit to dissipate power if the
voltage on the bus goes above a certain level.
Signal Wiring
Logic power of +36 VDC is provided separately. Logic power is constant per motor (refer to
Table 4-1 on page 4-38 ). Separating the logic and propulsion power busses allows propulsion
power to be removed (e.g., during an EMO event) without losing motor logic functions (con-
figuration data, vehicle data, fault information, etc.). Having separate power busses also
allows the motors to be programmed and configured without enabling the propulsion power.
NOTE: The standard wiring provided as part of a MagneMover LITE transport system pro-
vides this separation of power busses.
Ground
Proper grounding of the MagneMover LITE transport system is required to ensure proper
operation and to minimize electrical safety issues.
• The bodies of the motors are grounded through the GND connection on the power
connector.
• The NC LITE and SYNC IT modules are not grounded through their power connec-
tions. The cases of these modules must be grounded to an electrical safety ground (PE)
through their mounting features.
• The NC-12 is grounded through the GND stud on the Node Controller.
• All power supplies must be grounded to an electrical safety ground (PE) via the safety
ground in the AC input connector.
• All junction boxes must be grounded to an electrical safety ground (PE).