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7 Troubleshooting
Problem
Possible reason
Suggested solution
POWER LED is not lit
Power supply not connected.
Connect power supply.
Power supply is switched OFF at the
mains.
Switch on power supply at the
mains.
Power switch on the rear panel is
switched OFF.
Toggle power ON/OFF switch to ON
position to turn on unit.
NPC-D-6xx0 is defective
Report fault to Queensgate
POWER LED is red (steady or
flashing)
Unit still being configured (LED steady
RED)
Wait until the unit has configured
itself (up to 30 seconds)
Fault detected, including software crash
(LED flashing RED)
Turn off, wait 10 seconds and then
turn on again.
NPC-D-6xx0 is defective (LED steady or
flashing RED)
Report fault to Queensgate
Channel OPEN/CLOSED LED
is not lit
Stage not connected
Connect stage
Stage not detected
Stage faulty
– return to Queensgate
for inspection.
IN-POS LED is not lit
for most of the time
Stage is not settling to the specified
levels before receipt of the next position
command.
If you are commanding the Stage
with a continually changing input
(e.g. a ramp) there will be a time lag
between the commanded and the
measured position.
This can be reduced by reducing the
command rate change to allow more
time for the Stage to settle.
READY LED is not lit
all of the time
Stage is not being detected or cannot
reach the target position
Check the Stage connection to the
controller, that the step parameters
are within the range of the Stage
and that the Stage is mechanically
free to move.
Stage does not move as
expected
Stage not connected
Check connector mounting. Check
that the Stage is mechanically free
to move.
Controller parameters not correctly set
Adjust PID parameters and check
Mode settings.
Stage oscillates
Stage mounting and load.
The stability of a Stage is affected by
its mounting method and the load
placed on it, particularly if the load is
heavy (>100 g) or has its own
resonant structure.
Consult Queensgate if assistance is
required.
Closed loop parameters are unstable
Adjust the PID parameter settings.
Consult Queensgate if assistance is
required.
Controller is running in open loop mode
Switch to closed loop mode