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9.1.2
Command and Logic 'Circuits (Cont'd.)
starter will not
ene~ize.
Operation of the K motor overloads will
keep starter
"MAl"
from
energi~ing.
If no faults are present the
drive may be started and operated in accordance with the position
.of the mode selection switch.
If the #1 position is selected the
KXA motor may be operated in the manual mode.
In the AUTO posi-
tion both motors will operate as called for by the system pressure
sensor.
In
the #2 position the constant speed K motor will operate
in the emergency mode at rated speed.
9.1.3 Regulator
The next portion of the system to be covered is the regulator whicl
is the heart of the system.
The regulator consists of six printed
circuit cards.
The power supply has no adjustments but the inputs
of each supply are fused.
The Coordination Card receives a very
low voltage signal input from either the automatic sensor or manual
speed control pot.
This signal must be amplified and conditioned
for the driver coordination card.
This card has three adjustments.
Their purpose is explained in Table 2-1.
The input of this card is
normally a negative voltage which can be monitored on regulator TB
terminal seven.
The output of this card can be monitored on regulator
TB terminal twenty.
A subcircuit card mounted on the coordination card is the oscillator
circuit which produces a continuous pulse train that is sent to
each of the three gate pulse generator cards.
The three adjustments
on the coordination card are stability, range and response.
The input from the coordination card to the driver coordination card
is fed into an amplifier.
The amplifier's function is to take the
signal input from the coordination card and amplify it.
The output
of the amplifier is in turn fed into a straight amplifier for ampli-
fication.
At this amplifier, the signal is summed with the output
of the current limit amplifier.
The summation of the two input
signals will be of different polarities.
The current limit ampli-
fier's input is to protect from an overcurrent condition in the
power conversion module. This amplifier will turn on at a point de-
termined by the current limit adjustment and cause the output of the
driver coordination card to decrease until a safe limit of current is
maintained at the power conversion unit.
The current limit signal
input to the driver coordination card is obtained from the power
conversion unit.
The output of the driver coordination card may be
monitored on regulator TB terminal 14.
The output from the driver coordination card is then fed to three
identical gate pulse generator cards.
The
~ate
pulse generator
card's function is to tell the power conversion module's SCR when
to
fire (conduct).
Each gate pulse generator card consists of two
identical circuits which in turn produce two outputs.
Therefore,
9-2
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