Operation
Theory of Operation
QuickStick HT User Manual
237
Rockwell Automation Publication MMI-UM007F-EN-P - September 2020
Moving Vehicles by Hand
Only move vehicles on the QuickStick HT transport system using the QSHT motors in the
system. If there is an event that requires moving the vehicles by hand, the guidelines that are
provided here must be followed.
If both propulsion power and logic power to the transport system are removed, there is no
tracking of vehicles being provided. Once power is restored the transport system must be
restarted, which detects all vehicles at their current locations.
If propulsion power to the transport system is removed while logic power is maintained and a
vehicle is moved manually on the motor, the transport system tracks its position. If the center
of the magnet array on the vehicle crosses a motor boundary (moves off the end of a motor), it
creates an Unlocated Vehicle Fault. Vehicles that have crossed a motor boundary are said to
have lost their signal (Vehicle Signal = 0) when monitoring the vehicle status through the Host
Communication Protocols. See either the
Host Controller TCP/IP Communication Protocol
User Manual
,
Host Controller EtherNet/IP Communication Protocol
User Manual
,
A vehicle that has been manually moved, bumped, or dislodged, and lost its signal, is able to
reacquire its signal when it is manually relocated to within approximately 25 mm of its origi-
nal position as measured from the center of the magnet array in a vehicle or the mid-point
between arrays in a tandem vehicle. When propulsion power returns, the vehicle is not able to
move unless it had been returned to the same section of the motor where it was located when
the power was shut off. In this case, the vehicle is shown as having signal (Vehicle Signal = 1)
but it also shows as Suspect. Vehicles that are identified as Suspect require a restart of the path
where they are located to clear the Suspect bit. In some cases, the vehicle can be commanded,
but it continues to show as Suspect.
NOTE:
The vehicle IDs for all vehicles on a path that is reset are not maintained. That is, a
vehicle can be assigned a vehicle ID different from the ID it had before the path was
reset.
CRUSH HAZARD:
Moving mechanisms have no obstruc-
tion sensors.
Do not attempt to move any vehicles manually while propul-
sion power is supplied to the transport system or personal
injury could result in the squeezing or compression of fingers
or other body parts between moving mechanisms.
SHOCK HAZARD:
Moving vehicles by hand produces
eddy currents in the stators of the motors where the vehicle is
being moved, which puts power on the propulsion bus.