22.4 Scaling: analogue input

It is possible to scale 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 2 connector (J8). Ground to the 0V terminal of the same connector.

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 2 connector (J8). When

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

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

The speed of the pump as set by Analogue 1 is scaled in proportion to the signal from Analogue 2 according to the formula y=as, where a is the speed set by Analogue 1, s is the scaling set by Analogue 2 (0V or 4mA = 0, increasing linearly to 10V or 20mA = 1), and y is the scaled rotation speed. If Analogue 2 has been set for an inverted response, the reverse is true. See 18.2 Analogue in the Setup menu.

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

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