11
Master signal generator
The PCM4 can be used as a master controller to:
(1) provide a floating DC master voltage input to other PCM4
modules interfacing with standard variable speed drives or
(2) to drive several variable speed drives directly, provided that
their circuit design permits wiring of their speed circuits in
common.
Unidirectional applications require a positive PCM4 output.
Connect a 10K ohm potentiometer (not provided with the PCM4)
as the master control pot using the +15 VDC supply on the
PCM4.
The normal wiring of an external master control potentiometer is
the CW side of the potentiometer to +15 V supply (terminal 6),
and the CCW side to COM (terminal 7). The potentiometer wiper
is connected to INPUT 1 (terminal 8). See Figure 6 (page13) .
The potentiometer is rotated clockwise to increase the voltage at
INPUT 1 and, therefore, increasing the PCM4 output voltage.
Warning
Bidirectional output mode should never be used with
standard SCR (single quadrant) variable speed drives.
These drives only respond to one polarity in their speed
setting circuits.
m
Installation
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