When used in manual percentage output mode, the PXU series of process controller can be used as a digital potentiometer. Models, with the 4-20 mA retransmit function, can have this output scaled to track setpoint value, percentage output value, or process input value.
APPLICABLE PRODUCTS
Any PXU series process controller with analog voltage or current main control output. Models with the optional 4-20 mA retransmit function can also be used.
PRE-REQUISITES
- PXU control model must support analog voltage or current output. The optional 4-20 mA retransmit function also can be configured for manual output.
IN THIS ARTICLE
Input Jumper Setting
If feedback is 4-20mA or the 4-20mA output is looped through the input, then the internal jumper (JP8) must be moved to the 4-20mA position.
Meter Feedback Signal
By placing the controller in the manual mode, the analog output can be adjusted to the desired percentage by changing the bottom display value. In order to see the output in engineering units, the output will need to be wired to the input. If using a current output, the input will need to be wired in series with the output and the load. If using a voltage output, the input will need to be wired in parallel with the output and load. See below for recommended settings:
Programming note: (Only non-factory settings are shown)
Reference the PXU Product Manual for more information.
Parameter Loop Setting
trnF=USEr
Hidden Loop Settings
1-IN
tYPE = feedback signal type, 4-20, or 0-10V
DSP1 = Engineering units: low value of feedback signal
DSP2 = Engineering units: high value of feedback signal
3-LC
SP=LOC
OP1=DISP
Suggest setting all other parameters to the LOC menu
Other Programming Options (Model Dependent)
Retransmit models PXUxxCx0
4-20 output (Active, powered)
Programming: (Only non-factory settings are shown.)
Hidden Menu Settings
1-IN
DECPT=user defined
2-OP
ANAS = OP1
3-LC
SP=LOC
OP-1 = DISP
Wiring: Output
1/16 Din models 15 – 16 + to device
1/4 & 1/8 Din models 18 – 19 + to device
If monitoring the output on the top line, then add the following:
Programming: (Only non-factory settings are shown.)
Hidden Menu Settings
1-IN
Type=4-20
dSP1= (ANLO values)
dSP2= (ANHI values)
Input Range Jumper
Open controller, place JP8 jumper on both pins
Wiring:
1/16 Din models 15 – to device (16 + jump to 11) 12 is now + to device
1/4 & 1/8 Din models 18 – to device (19 + jump to 11) 12 is now + to device
Models without Retransmit Option (PXU3x0x0 PXU3xAx0 PXU3xBx0 PXU3xDx0)
4-20mA output (Active, powered)
Programming: (Only non-factory settings are shown.)
Parameter menu setting
trnF= MAN or USER
Hidden Menu Settings
3-LC
SP=LOC
OP1=DISP
Suggest setting everything else to LOC.
Wiring: Output
1/16 Din models 6 – 5 + to device
1/4 1/8 Din models 9 – 8 + to device
Monitoring the output on the top line, then add the following:
Programming: (Only non-factory settings are shown.)
Hidden Menu Settings
1-IN
Type=4-20
dSP1= (0.0 or engineering units: low value)
dSP2= (100.0 or engineering units: high value)
Input range Jumper
Open controller, place JP8 jumper on both pins
Wiring:
1/16 Din models 6 – to device (5 + jump to 11) 12 is now + to device
1/4 & 1/8 Din models 9 – to device (8 + jump to 11) 12 is now + to device
Models without Retransmit (PXU4xxx0)
0-10V output
Programming: (Only non-factory settings are shown.)
Parameter Menu Setting
trnF= MAN or USER
Hidden Menu Settings
3-LC
SP=LOC
OP1=DISP
Suggest setting everything else to LOC
Wiring: Output
1/16 Din models 6 – 5 + to device
1/4 & 1/8 Din models 9 – 8 + to device
Monitoring the output on the top line, then add the following:
Programming: (Only non-factory settings are shown.)
Hidden Menu Settings
1-IN
Type=0-10
dSP1= (0.0 or engineering units: low value)
dSP2= (100.0 or engineering units: high value)
Wiring:
1/16 Din models 6 – 5+ to device (5 + jump to 11 and 6 to 12)
1/4 & 1/8 Din models 9 – 8+ to device(8 + jump to 11 and 9 to 12)