Watson-Marlow 704U - Manual (Page 6)

Watson-Marlow Bredel E-Manuals
http://www.watson-marlow.it/pdfs-global/m-704su-gb-03.htm[10/07/2012 14:21:14]
Direction
Connect remote switch between pins 5 and 16 and disable the front panel reversing control
by linking pins 6 and 18 of the 25-pin cage clamp connector. Open switch for clockwise
rotation, close for counter-clockwise. Alternatively a TTL compatible logic input (Low 0V,
High 5V) may be applied to pin 5. Low input will run the pump in a counter-clockwise
direction, high input in a clockwise rotation. No connection: the pump will default to
clockwise rotation.
Speed
A remote potentiometer with a nominal value of between 1kW and 2kW with a minimum
power of 0.25W should be wired as shown. When using a remote potentiometer, do not
apply a voltage/current control input signal at the same time. The speed control signal will
require calibration relative to the minimum and maximum settings of the potentiometer.
Use the offset and range potentiometers as described under Calibration, above.
Strobe
The start / stop state of the pump may be monitored by utilising a 5V Hi Lo strobe line
available at the 25-pin cage clamp connector on the pump rear panel. The strobe line will
change state as soon as the motor starts or stops.
Tachometer
This facility can be used to indicate motor speed or total the number of motor revolutions.
When using the square wave, the output is: 360rpm = 4603Hz.