Multistretch Interface Board Calibration Instructions
For MIB-336 Interface Board.
Adjustments:
Gain; The Pot controls the system Gain.
This control injects an offset voltage, which adds or subtracts from the voltage
reference defined by the External Tension Adjustment (Film Tension Potentiometer);
his will allow extremes of adjustment to be set to levels consistent with proper
operation. Typically, the Gain will be used to center the operating range in linear
portion of its characteristics.
Note: This adjustment is normally made at the factory and should not require fields
adjustment.
Zero: The Pot controls the system loop gain.
This system loop gain may be adjusted if the motor continues to be energized when the
dancer arm is unloaded and at rest. With the machine stopped, the potentiometer should
be adjusted to ensure that the motor is de-energized in this condition, and so that a light pull
on the free end of the film causes the film to feed freely. Counter clockwise (CCW)
adjustment of this potentiometer will increase the response time i.e. (soften the motor
tension response). Clockwise (CW) adjustment decreases the response time i.e. (sharpen
the motor response) plus increases the maximum possible motor speed attainable.
Trip:
The output relay located on MIB-336 Board ( Outputs: Com (14); NO(13); NC(15) )
energized when the voltage between (11) & (12) overshoots the level selected on the
potentiometer marked “Trip”. It de-energizes when the voltage falls below the normal
current by approximately 5% or when power to board breaks.
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