Parker RAC Europe
PSD04 | User manual ver. 3.6 | Code 144PSDI364
Page 22 of 74
The operation mode is set by using Main control type (Pcty), and when the valve is enabled:
if Pcty = 0
the system remains held in the Stand-by on (11)
if Pcty = 1... 5 or 7 the analog positioner (30) operation mode begins
if Pcty
≥
6
start SH-algorithm or manual mode.
Please note regardless of the state of the enabled valve, disabling it will cause a positioning procedure using the value
specified in stand-by position (parameter Pr20), after which the state is changed to Stand-by off (10).
6.4
Enabling PSD04
Excluding the automatic movements, it is necessary to enable the valve module PSD04 before moving it.
Enabling mode (parameter Pr06) configures the enabled features to be accepted.
When the valve is to be used in standalone mode, the enable digital input function mode must be chosen (parameter
Pr06 = 0 or Pr06 =1).
The selection must be made based on the type of input to be used.
In a typical application the DIHV (parameter Pr06 = 1) would be connect it in parallel to the compressor, so that the
valve is enabled at the same time as the compressor.
To enable the valve using digital inputs, it is necessary for these to be configured correctly, otherwise a configuration
alarm will be generated.
In particular:
If Pr06 = 0:
the DI1 or D12 input must be configured as enable > Ph11 = 1 or Ph21 = 1
If Pr06 = 1:
the DIHV input must be configured as enable
> Ph31 = 1
Selecting a value from 2 to 9 allows the valve to be enabled via a serial port, using MODBUS or CAN communication
protocols: this selection must be made if an external controller manages the PSD04.
Selecting a value from 6 to 9, it is possible to operate the PSD04 in standalone mode if a communications fault occurs,
in this case the DI1 or DI2 inputs must be configured as enable (parameter Ph11 = 1 or Ph21 = 1).
The enabling of the valve using a communication network requires system which ensures the PSD04 can determine
whether the controller is still online: the PSD04 expects the controller to update the variable Enable valve command
(parameter EnaV) periodically.
The Enable valve command (parameter EnaV) has different addresses according to the communication system chosen:
-
CAN (Pr06 = 2 or Pr06 = 6)
-
MODBUS RS-485 (Pr06 = 4 or Pr06 = 8): EnaV address = 1281
6.5
Analog positioner control
The analog positioner mode permits the valve position to be moved linearly respect to the value applied to the active
analog input.
Pcty =
01
> analog positioner on AI1 (0÷20mA)
Pcty =
02
> analog positioner on AI2 (4÷20mA)
Pcty =
03
> analog positioner on AI3 (0÷5V)
Pcty =
04
> analog positioner on AI4 (0÷10V)
Pcty =
05
> analog positioner on AI4 (Pia4).
To enter analog positioner mode, for Stand-by, set the Main control type (parameter Pcty) with a value between 1 and
5, and enable the valve; if all the configuration are correct enter in Stand-by on (11), and then in the Analog
positioner (30).
To exit the analog positioner mode, it is necessary to disable the valve, this will cause the valve to move to the
positioning value specified in Stand-by position (parameter Pr20), before entering the Stand-by off (10).
The setting of Main control type (parameter Pcty) with a value between 1 and 4 selects the type of probe that connects
to the indicated AI if the parameter Pcty = 5 connect the probe Ai4 to AI4 and change the parameter Pia4 to select the
probe type.