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7. If the motor does not operate, check all connections and fuses. If a fuse is
blown and the motor is not locked (stalled) or overloaded, do not replace
the fuse. The control may be damaged. Refer to “Troubleshooting” in this
manual and the motor control manual. If the motor is overloaded, reduce
the load and replace blown fuses with new ones of the proper rating. (See
page 15).
Internal Adjustments/Calibration
The Model 3984 is factory adjusted to provide a VOUT signal of 0 to 10 VDC
for a 0 to ±10 VDC signal applied to VIN. The polarity of the output voltage is
always positive regardless of the input.
If other input signal ranges are required, the Model 3984 can be calibrated
using the following procedures for adjusting the MIN and MAX potentiometers.
WARNING
Use a non-metallic or insulated adjustment tool (such as a television
alignment tool) for internal adjustments. Circuit components are not at
ground potential and accidental short circuiting and shock hazard may
occur with conducting tools. Adjustment should be made only by qualified
service personnel.
MIN Speed Trim Potentiometer:
The MIN trim potentiometer is used to adjust
the minimum speed of the motor to correspond to a specific input voltage
or current signal. For example, by adjusting the MIN potentiometer CW it is
possible for the motor to run at a minimum speed in the absence of an input
signal. This is useful in applications where the motor must keep running.
To adjust the MIN trip potentiometer:
1. Apply the desired voltage or current signal across terminals VIN1 or VIN2
and ICOM on terminal block TB2.
2. Adjust the MIN potentiometer until the motor RPM reaches the desired
level.
CAUTION
Adjusting the MIN potentiometer will affect the MAX potentiometer
setting and the MAX potentiometer will have to be readjusted.
