Operation
Theory of Operation
QuickStick HT User Manual 243
Rockwell Automation Publication MMI-UM007F-EN-P - September 2020
QSMC Power-Related Warnings and Faults
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 6-1.
Soft Start Switch Off Fault
Upon initial power-up, when the internal propulsion bus in the motor is below +270V DC, the
motor reports that the soft start is not complete (soft start switch off bit is set). The HLC
reports this fault to the host controller as a soft start switch off fault (see either the Host Con-
troller TCP/IP Communication Protocol User Manual, MMI-UM003, or the Host Controller
EtherNet/IP Communication Protocol User Manual, MMI-UM004) and the motor does not
allow vehicle motion to occur. Once +270V DC is reached, the motor supports vehicle motion
and the soft start fault message self-clears.
If the internal propulsion bus voltage drops below +250V DC during operation, the motor
reports a soft start switch off 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 under active control and as such their motion is undefined. Normal opera-
tion resumes once the internal propulsion bus rises back up to +270V DC.
Undervoltage Fault
Upon initial power-up, when the internal propulsion bus in the motor is below +250V 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 +250V 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
Table 6-1: Propulsion Voltage Range- QSMC Controllers
Voltage (VDC) Event Status
250 Undervoltage fault triggered, inverters disabled
Voltage too low
Motor operation suspended
270 Soft Start Not Complete fault triggered\
270 Minimum recommended operating voltage
Operating Range
420 Maximum Recommended operating voltage
430 Overvoltage fault triggered, inverters disabled
Voltage too high
Motor operation suspended
Motor in normal operating condition.
Motor in fault condition – does not control vehicles (motion is undefined).
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