Signal Converter for Danfoss Valves

Some Danfoss valves, such as the PVEM, require a control signal that goes from 25% to 75% of the valve’s supply voltage, and is centered at 50%. For example, if the valve is powered with 24V, the control signal must be 6-18 Vdc, with 12 Vdc being neutral.

There are two separate methods for the RMC to control this type of valve:

  1. A converter.
  2. Use a 12 Vdc or 10 Vdc power supply to the valve and modify the RMC output axis parameters.

Converter:
The following devices are able to convert from the RMC’s +/-10V output to 6-18 Vdc:

12 or 10 Vdc valve supply and set the RMC output settings correctly:
A 12 Vdc supply means the control signal to the valve is 3V to 9V, centered at 6V.
A 10 Vdc supply means the control signal to the valve is 2.5V to 10V, centered at 5V.

RMC200 with 12 Vdc valve supply (10 Vdc in parentheses):

  1. In the Axis Parameters, on the All tab, in the Output section, set the following:
    a. Output Type: Custom V
    a. Voltage at 100%: 9 (7.5 for a 10 Vdc supply)
    a. Voltage at 0%: 6 (5 for a 10 Vdc supply)
    a. Voltage at -100%: 3 (2.5 for a 10 Vdc supply)
  2. Download the settings and update Flash.

RMC75/150 with 12 Vdc valve supply (10 Vdc in parentheses):

  1. In the Axis Parameters, on the All tab, in the Output section, set the following:
    a. Output Bias: 6 (5 for a 10 Vdc supply)
    a. Output Scale: 3 (2.5 for a 10 Vdc supply)
  2. Download the settings and update Flash.