Operation
Theory of Operation
246 MagneMotion
Rockwell Automation Publication MMI-UM007F-EN-P - September 2020
QSHT Inverter Power-Related Warnings and Faults
When using the 2198-Pxxx DC-bus power supplies, fluctuations in the voltage that is seen at
the motor power terminals are due to voltage drops when the QSHT motors consume power
while moving vehicles and voltage increases during regeneration events. These fluctuations
can lead to the motor issuing warnings and faults and can cause motor shutdown as shown in
Table 6-2.
Undervoltage Fault
Upon initial power-up, when the internal propulsion bus in the motor is below +330V DC, the
motor reports an undervoltage fault to the HLC. Once this fault clears, it only reappears if the
internal propulsion bus voltage drops below +330V DC. The HLC reports this fault to the host
controller as an undervoltage 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). This fault self-clears when the internal propulsion bus
voltage rises above +350V DC.
If the internal propulsion bus voltage drops below +330V DC during operation, the motor
reports an undervoltage fault through the HLC to the host controller. When this fault is
reported, vehicles motion over the motor is suspended. Normal operation resumes once the
internal propulsion bus rises back up to +350V DC.
This fault is likely due to excessive +458–747V DC power cable and +458–747V DC return
cable resistance from the power source to the motor.
Overvoltage Fault
When the internal propulsion bus in the motor rises above +830V DC, the motor reports an
overvoltage fault to the HLC. The HLC reports this fault to the host controller as an overvolt-
Table 6-2: Propulsion Voltage Range- QSHT 5700 Inverter
Voltage (VDC) Event Status
330 Undervoltage limit Lo
Volt a ge To o L o w
Motor operation suspended
350 Undervoltage limit Hi
458 Minimum recommended Operating Voltage
Operating Range
757 Maximum Recommended Operating Voltage
820 Overvoltage Lo
Volt a ge To o H i gh
Motor operation suspended
830 Overvoltage High
Motor in normal operating condition.
Motor in fault condition – does not control vehicles (motion is undefined).
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