Operations and Maintenance Manual Control System Description
Version 1.2 - June 2004 5 - 5
SERVO AMPLIFIER
Refer to engineering drawings labeled 118168E_ (electrical) and 118168L_
(logic/software) for the following discussion. For each of the six DC motors discussed
above in the Servo Control section, an amplifier module communicates between the
motion control board and the brushless DC servo motor. The amplifier modules are
identified as 1BSC, 2BSC, 3BSC, 6BSC, 7BSC, and 8BSC for axes 1, 2, 3, 6, 7, and
8, respectively (axes 4 and 5 are AC). Each amplifier module chassis is supplied with
110 VAC which creates a 170 VDC power supply. The motor is enabled when the
inhibit line input of the amplifier module is high. The inhibit line input is turned on and
off by a digital output controlled by the machine’s control computer.
The amplifier module receives an analog velocity command signal from the servo
channel of the motion control board. In response to the velocity command input, the
amplifier module uses pulse width modulation for exciting the motor windings, to
ramp the motor up or down to constant velocity. Encoder signals provide information
regarding the motor's absolute position and velocity.
To Next Page
Loading...
