22.3 Speed: analogue input

It is possible to control the speed of the pump remotely by one of these methods: a voltage analogue signal within the range 0-10V; or a current analogue signal within the range 4-20mA; or a remote potentiometer using the 10V supply at J7.

The analogue process signal must be applied to the i/p ter- minal of the Analogue 1 connector (J5). Ground to the 0V terminal of the same connector. The pump will provide an increasing flow rate for a rising control signal (non-inverted response) or an increasing flow rate for a falling control sig- nal (inverted response). See 16.2 Analogue in the Setup menu.

4-20mA circuit impedance: 250Ω.

For voltage mode, 0-10V, a stable, reliable voltage source can be used with a DC voltmeter. Circuit impedance: 22kΩ.

Inverting the response is set up in software. Do not invert the polarity of the termi- nals.

A remote potentiometer with a nominal value of between 1k and 2k with a minimum of 0.25W should be wired between the ter- minals of the Rem-pot connector (J7) and the i/p terminal of the Analogue 1 connector (J5). When

using a remote potentiometer, do not apply a voltage or cur- rent control input signal at the same time. The speed control signal will require calibration relative to the minimum and maximum settings of the potentiometer. This is done in soft- ware - see 18.1 Trim in the Setup section.

When using a remote potentiometer, it is important to set the analogue input to volt- age in the Setup menu. Otherwise the reference voltage supply from the Rem-pot connector will be overloaded and will not provide a full 10V.

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Watson & Sons 520DUN user manual Speed analogue input
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520DUN specifications

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