Pulsafeeder Pulsar DLC - Manual (Page 18)

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5.5.1 Analog Inputs
The DLC can accept one analog input signal. This signal controls the pump’s flow. The Analog Input
is used to control pump stroke.
The Analog input accepts current inputs in the range of 0 to 25mA (e.g., 4-20mA) provided the 'span,'
(the difference between the High and Low value), is greater than 2mA. Voltage signals in the 0-5 volt
range are accepted but displayed as current during Analog Input calibration.
Split-ranging, reverse acting, and ratio control are accomplished in the calibration routine in Section 7
– General Operation. No hardware adjustments are required. The channel is electrically isolated,
surge protected and fused for protection. The input is designed to avoid damage in the event high
voltage is inadvertently applied.
To make the Analog Signal connection, use 0.32mm 2 – 0.52mm 2 (22-20 AWG) wire for hookup.
Attach the analog signal generated by an external device (e.g., PLC) to the connection points labeled '1-
CURRENT1(+)' and '2-CURRENT1(-)' on the J4 terminal block labeled 'INPUT' (refer to Figure 5).
Attach the Positive lead to position 1 and the Negative lead to position 2.
Position indicators are printed on the circuit board above the terminal. The DLC will provide
approximately 200 ohms of resistance to a current loop. The Analog Input is isolated from all other
inputs, outputs and earth ground. Follow the instructions in Section 7 – General Operation for Analog
Input signal calibration and set-up.