Pulsafeeder Pulsar DLCM - Manual (Page 19)

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5.5.1 Analog Inputs
The DLCM can accept either one or two analog input signals. These signals ultimately control the
pump’s flow. Analog Input #1 is used to control either the pump stroke and speed (refer to the note:
below) or the pump stroke only. When Analog Input #2 is used, it controls motor speed only.
The DLCM can operate using only Analog Input #1 to control both Stroke and Motor Speed. If this is
the desired mode of operation, the installed software will determine what Stroke and Speed are required
to produce the desired flow rate (refer to Section 7 – General Operation: End Point Set Up) for further
information.
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 channels are electrically isolated,
surge protected and fused for protection. The inputs are designed to avoid damage in the event high
voltage is inadvertently applied.
To make the Stroke Length Control 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.
To make the Motor Speed Control 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 '7-
CURRENT2(+)' and '8-CURRENT2(-)' on the J4 terminal block labeled 'INPUT' (refer to Figure 5).
Attach the Positive lead to position 7 and the Negative lead to position 8.
Position indicators are printed on the circuit board above the terminal. The DLCM will provide
approximately 200 ohms of resistance to a current loop. Each 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.