Installation Manual

7-6 Theory of Operations
X and Y Servo Amplifiers
The X and Y Servo Amplifiers are mounted on individual Interface PWAs located in the front of the
Servo Shelf. Each Amplifier receives low-voltage direction and power commands from the PMAC, and
receives motor direction signals from the Hall Sensors on the X and Y Servo Motors.
The Amplifier reacts to the PMAC power commands and provides the high power level required to move
the Servo Motor. The Amplifier interprets the directional input from the Hall Sensors and directs power
toward the windings that will cause the motors to move in the desired direction.
The Servo Amplifiers are rated for 100 volts to accommodate the high output voltage (42 to 85 VDC)
from the unregulated motor power supply.
Servo Power Transformer
The Transformer receives 208 to 240 VAC, 50 – 60 Hz from the Power Manager and outputs an
unregulated 42 to 85 VDC to the Servo Supply Capacitors. The Transformer is protected by a fuse (8A)
located in the Power Input Assembly.
Low Pressure Sensor
The Low Pressure Sensor is located on the right side of the Servo Shelf. It can be manually set for a
pressure from 10 to 100 psi (69 to 689 kPa). The sensor will issue a signal when main air pressure is
lower than the manual set point. This signal will cause the yellow light on the Light Beacon to flash and
give a software error before dispensing is performed.
Main Air Solenoid
Located behind the Low Pressure Sensor on the Servo Shelf, the Main Air Solenoid turns ON air
pressure to the dispensing system when FmNT initializes and the green
ON (l) button on the Operator’s
Console is pressed.
Dual Action Solenoid
The Dual-Action Solenoid Valve is located at the right rear of the Servo Shelf. Two 1/8-inch pneumatic
lines, one black and one blue, go through the Cat Track to the Dispensing Head bulkhead. On the
bulkhead, the blue hose connects to the T/ON port and the black hose connects to the T/OFF port. On
systems equipped with a Dual-Action Dispensing Head, the air pressure from these ports lowers and
raises a second Dispensing Valve (Valve 2). .
DC Cooling Fan
Located on the panel on the right side panel next to the Servo Shelf, the fan blows cool air across the
electronics. The heated air is vented through a passive grille on the left side panel next to the Servo Shelf.
.