Page 6/60 H2B USER'S MANUAL - 550145G
2.2 CONTROL UNIT
2.2a Microswitches
Microswitches send a voltage signal when the request for startup or desired function is
made. Microswitches for forward, backward, and rapid inversion (if present) are dimen-
sioned for carrying the current of one contactor (3 amp).
2.2b Potentiometer
In the 3-wire configuration, the CPOT (C1) useful input signal goes from 0V to 10V.
The resistive value of the potentiometer must be between 500 ohm and 10 kohm, as lower
values overload the power supply.
2-wire potentiometer (please request while ordering):
It is possible to use the potentiometer in the 2-wire configuration but you should state its
ohmic value since a resistor on the logic boars must be installed accordingly.
Correspondence between the voltage signal to pin C1 and motor voltage.
The procedure for automatic potentiometer signal acquisition is carried out from the con-
sole. This makes it possible to adjust the minimum and maximum useful signal in the re-
spective directions.
This function is indispensable when it is necessary to compensate for asymmetry in the
mechanical workings that control the potentiometer, especially as regards the adjustment
of the minimum which in certain cases, if made in the traditional way, requires a calibration
that is laborious and costly, but very often gives unsatisfactory results.
The sequence of procedures is described in the programming console manual.
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