Agilent 8453 Dissolution Testing System Installing and Operating Manual 81
Using the Peristaltic Pumps 1VS and 8VS 3
Servicing Your Pump
Pump Drive Electronics
• Speed Control Potentiometer
The speed control potentiometer gives a set point for the motor speed to the
operational amplifier U1. The numbers on the potentiometers are in
arbitrary units.
• Speed Sensor
The speed sensor consists of a speed generator and an amplifier. The
voltage produced is proportional to the cycles of the motor.
• Amplifier U1, Transistor Q1, Direction Relays, Motor M
The voltages from the speed control potentiometer are compared with the
speed sensor and the result is used to drive the 24 V DC motor M (through
Q1 and the direction relays).
• Remote Logic, Remote Enable Relay
For remote operation connecting the remote cable to the pump
automatically pulls the remote enable line to ground. When this occurs the
remote logic connects to the direction relays and the remote lines are used
to control the pump. When Pump on, CCW line is pulled to ground the
pump turns on in a counterclockwise direction. In addition, when the
Direction, CW line is also pulled to ground the pump turns on in a
clockwise direction.
For the pin connections see Table 22 on page 84.
• Direction Switch
For manual operation the direction switch, on the front panel, controls the
direction of the pump through the direction relays. This switch is
operational only when the remote cable is not connected.
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