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9.1.5'
Power Conversion MOdule CCont'd.)
spect to each other.
Three SCR's will conduct on the positive
portion of each· cycle of three phase input.
The other three will
conduct on the negative portion of each cycle of the input.
The opposite half of the cycle for the conducting SeR ' s will cause
them to stop conduction (turn them off)., The $CR heatsinks also have
a thermal protection device to sense an over temperature condition,
which, if reached, will de-energize FRl relay, shutting the
drive down.
9.1.6
AC MOtor
The KXA motor reacts to the amount of conduction that the SCR's have
allowed, and provides the proper amount of voltage that provides the
required torque and speed to maintain the pressure level command from
the sensor.
The motor is equipped with thermal protective devices
which will shut off the AC power
by
opening starter
~if
an over-
load condition exists which would cause motor overheating.
The K motor is prorected
by
overload heaters which will open starter
MAl if an overload condition exists.
9-4
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