Chapter 2 Installation | Series 830/840/860 Instruction Manual |
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Input Signal Connections (Controllers Only)
A 0-5 VDC (4-20 mA optional) set point command input signal al- lows you to set the flow to any desired value within the range of the controller. The set point input signal is a direct linear represen- tation of 0 to 100 percent of the controller’s mass flow full scale value.
For 0–5 VDC set point control, connect a manual-adjust potentiome- ter as shown below. Any potentiometer value between 5K and 100K may be used but is limited to a VDC input signal only. For 4-20 mA or 0–5 VDC set point control, use a PLC or other digital device.
If the set point input is not connected to some type of control device, the valve on/off switch must be activated in the off position. If no set point command is present on the controller when powered-up and the valve is not switched off, the valve will drift wide open.
Figure 2-11.
Local Command Set Point Potentiometer (15-Pin D-Connector)
Figure 2-12.
External Command Set Point Source (15-Pin D-Connector)
Note: Use 15 VDC maximum to produce a 4-20 mA setpoint signal.