Watson Marlow Pumps 604U, Manual, Page: 6 / 13

6
Calibration procedure
Ensure the correct wiring of the 6 pin plug and insert the plug into the socket at the rear of the pump.
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Remove the rear panel window.
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Turn the signal offset potentiometer clockwise until the slider traverse limit is reached and is signified by a clicking
noise. Now turn the potentiometer ten turns anticlockwise. Repeat for the signal range potentiometer. This
ensures correct potentiometer set-up for calibration.
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Set the process signal offset.
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Turn the signal offset potentiometer clockwise to set the drive shaft speed to the desired minimum.
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Set the process signal at its upper range limit (not exceeding 30V or 32mA).
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Turn the signal range potentiometer clockwise to set the drive shaft speed to the desired maximum.
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Repeat the procedure until pump response coincides exactly with the process signal.
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If the signal rises above its designated maximum, the action of the signal conditioner will be to hold the motor to
maximum speed at the MAX setting indicated by the LED indicator flashing. If the signal rises above 30V,
permanent damage, not covered by warranty, may result.
Securely replace the rear panel recess cover on the back of the pump ensuring the gasket is in
the correct position. This will avoid the ingress protection standard of the pump being
compromised
Remote control
Stop/Start
Connect remote switch between pins 2 and 5 of the 6 pin socket. Close contact to stop the pump, open to run.
Speed
A remote potentiometer with a nominal value of between 4.7kohm and 5kohm should be wired as shown, When using
a remote potentiometer do not connect a voltage/current control 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.
Tachometer output
This facility can be used to indicate motor speed or total the number of motor revolutions. Select either 1) 0-5V DC or
2) 5V pulse train output using the tachometer output switch.
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3.45kHz at 165rpm
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0.07kHz at 3.3rpm