PR181 module in DIN rail enclosure, front three-quarter view

PWM to 4-20 mA signal conditioner, isolated, with display

Article number PR181-X008

The PR181-X008 converts a PWM signal into a 4-20 mA signal. Input and output are galvanically isolated from each other and from the supply, so the module reads both high-side and low-side switched PWM signals without ground loops. DIP switches S1 and S2 select a PWM level of 3.3, 5, 12 or 24 V; limits and rise and fall rate are set on the display. As delivered, 0 % duty cycle gives 4 mA and 100 % duty cycle gives 20 mA, for a 24 V PWM signal.

Supply 9 to 30 V DC
Input PWM, 3.3 to 24 V; level 3.3, 5, 12 or 24 V selected with DIP switches S1 and S2
Output 4-20 mA as delivered, 21 mA max.; lower and upper limit adjustable

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Specifications

Specifications
Supply	9 to 30 V DC
Input	PWM, 3.3 to 24 V; level 3.3, 5, 12 or 24 V selected with DIP switches S1 and S2
Output	4-20 mA as delivered, 21 mA max.; lower and upper limit adjustable
Isolation	Input and output galvanically isolated from each other and from the supply
Setup	Display with UP, OK and DOWN buttons; DIP switches S1 and S2 for the input level
PWM frequency	100 Hz to 5 kHz
Rise and fall rate	Adjustable on the display
Ambient temperature	-25 to 55 °C, non-condensing
Dimensions	45 x 83 mm with DIN rail enclosure, 42.6 x 72 mm without
Factory setting	24 V PWM signal; 0 % duty cycle = 4 mA, 100 % duty cycle = 20 mA

Connections

Connections
Terminal	Function
Terminal 1	Supply plus
Terminal 2	Supply minus
Terminal 3	PWM input minus
Terminal 4	PWM input plus
Terminal 5	Not used
Terminal 6	Isolated output common
Terminal 7	Isolated 4-20 mA output (plus)
Terminal 8	Not used

Datasheet (PDF)PDF, 147 kB

Setup

Disconnect the PWM signal before changing the DIP switches, to avoid damaging the module.
Select the input level with S1 and S2: 24 V = S1 off, S2 off; 12 V = S1 off, S2 on; 5 V = S1 on, S2 off; 3.3 V = S1 on, S2 on.
Connect the module according to the terminal table and switch on the supply.
Bring the input to its lowest value, for example 0 % duty cycle. In the menu, select JoySet-L and confirm with OK; then select JoySet-M and confirm with OK.
Bring the input to its highest value, for example 100 % duty cycle. Select JoySet-R and confirm with OK.
Set the lower limit of the output with PWM min and the upper limit with PWM max: change the value with UP and DOWN and confirm with OK.
If required, set the rise and fall rate of the output with Ramp-Up and Ramp-Down.
Go to the SAVE menu to store the new settings.

Application

Converting a high-side or low-side switched PWM signal to 4-20 mA
Driving motors, pumps, valves and hydraulics smoothly with the adjustable rise and fall rate

PR181 series: signal conditioners with display

The modules in the PR181 series are set up on the display on the module, using the UP, DOWN and OK buttons. On most versions the lower and upper limits of input and output are set independently, as is the rise and fall rate of the output; the settings of each module are listed on the product page under Setup. With an adjustable rise and fall rate, motors, pumps, valves and hydraulics can be driven smoothly. On versions with an analogue output, that output is galvanically isolated from input and supply to prevent ground loops. New settings are stored through the SAVE menu. The standard DIN rail enclosure measures 45 x 83 mm (board 42.6 x 72 mm); versions with more terminals are wider. Most modules run on 9 to 30 V DC at -25 to 55 °C, non-condensing.

For some conversions there is also a version without display and without galvanic isolation in the PR100 series: it is set up with push buttons and runs on 12 and 24 V DC (operating range 11 to 30 V DC). Where one exists, it is listed on the product page under Other version.

More about the PR181 series