Valco Cincinnati VC350A, Manual

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7-12 Valco Cincinnati, Inc.
Section 7 - Initial Setup MC060 Manual/VC350AG AutoGlue Control System
The torque potentiometer (Figure 7-6) protects both the motor and control
against high surge currents. It will be set at the factory to match the
horsepower of a particular motor. It should not be field-adjusted. Adjustment
is required only if the hot-melt motor is being changed to a different
horsepower rating. Consult Valco’s engineering department for proper
adjustment procedures.
For automatic mode only. An IR compensation potentiometer (Figure 7-7) is
provided to substantially improve load regulation. If the load presented to
the motor does not vary substantially, the IR comp may be set at a minimum
level (approximately one-quarter of the full setting).
If superior performance is desired (less than 2% speed change of base
speed from zero to full load), the IR comp should be adjusted as follows:
1. Set the IR potentiometer at approximately 50% of travel.
2. Run the motor at approximately one-third speed and record the
revolutions per minute.
3. Run the motor with a maximum load and adjust the IR
potentiometer so that the motor speed under the load equals the
unloaded speed (see step 2).
4. Remove the load and recheck the unloaded revolutions per
minute.
5. If the unloaded revolutions per minute have shifted, repeat step
2 for more exact regulation.
Torque Potentiometer
torque potentiometer
Figure 7-6. Torque Potentiometer
IR Compensation
Potentiometer