Troubleshooting/Service
3/07 UDC3500 Universal Digital Controller Product Manual 321
Step What to do How to do it
4
Motor moves in both directions
but the displayed Output value
does not change or does not
have a decimal point
Slidewire input is malfunctioning. See the
Position Proportional field calibration
procedure in Section
6.5 for the motor
slidewire calibration procedure. Follow that
procedure to Field Calibrate the instrument. If
after a Field Calibration the problem is still not
fixed, then go to Step 6.
5
Motor does not move in one or
both directions
Wiring Problem. Check the motor
manufacturer’s wiring diagram and then refer
to Section
2 – Installation to rewire the
controller. If wiring is correct, then go to Step
7.
6
Determine if Motor Slidewire or
Input 3 is at fault.
Disconnect and tag the field wiring for the
slidewire. Refer to Section 2 – Installation.
Measure the voltage between the R (28) and
the – (30) terminals.
Voltage is +1.2Vdc ± 0.2Vdc: Bad motor
slidewire. Refer to the motor manufacturer’s
inst
ructions.
Voltage not +1.2Vdc ± 0.2Vdc: Check the
Jumper on the Input 3 Board (see
Figure
2-11). Jumper should be in W1 position. If not,
then move it to W1 position and recalibrate the
instrument per Section
1 – Output Calibration.
If the Jumper is in the W1 position, then
replace the Input 3 board. Installation
instructions supplied with the new board.
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