PR804 module in DIN rail enclosure, front three-quarter view

4-20 mA LED dimmer, low-side switched, adjustable limits and dimming speed

Article number PR804s03

The PR804s03 converts a 4-20 mA signal on terminal 4 into a low-side switched PWM output: the lamp is connected between terminal 1 (supply plus) and terminal 2. The input range extends to 25 mA; the signal minus shares terminal 6 (0 V) with the supply, so the module is not galvanically isolated. The MIN, MAX and SPEED trimmers on the board set the lower limit, upper limit and dimming speed of the output.

Supply 9 to 30 V DC, for 12 and 24 V DC systems
Input 4-20 mA on terminal 4, input range up to 25 mA
Output PWM, low-side switched: lamp between terminals 1 and 2

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Specifications

Specifications
Supply	9 to 30 V DC, for 12 and 24 V DC systems
Input	4-20 mA on terminal 4, input range up to 25 mA
Output	PWM, low-side switched: lamp between terminals 1 and 2
Isolation	Not isolated: terminal 6 (0 V) is also the minus of the 4-20 mA input
Setup	MIN, MAX and SPEED trimmers on the board; dimming curve adjustable
Output current	5 A max.
PWM frequency	120 Hz
Ambient temperature	0 to 80 °C
Dimensions	45 x 83 mm with DIN rail enclosure, 42.5 x 72 mm without

Connections

Connections
Terminal	Function
Terminal 1	Supply plus and lamp plus
Terminal 2	PWM output, to the lamp minus
Terminal 3	Not used
Terminal 4	4-20 mA input (plus)
Terminal 5	Not used
Terminal 6	Supply minus (0 V), also 4-20 mA input minus

Datasheet (PDF)PDF, 146 kB

Setup

Connect the lamp between terminal 1 and terminal 2.
Connect the 4-20 mA signal to terminal 4 (plus) and terminal 6 (minus).
Connect the supply to terminal 1 (plus) and terminal 6 (0 V).
Set the lower limit of the output with the MIN trimmer.
Set the upper limit of the output with the MAX trimmer.
Set the dimming speed with the SPEED trimmer.

Application

Dimming LED and halogen lighting steplessly with a 4-20 mA signal, in 12 and 24 V DC systems

PR804 series: dimmers with adjustable limits and dimming speed

The dimmers in the PR804 series convert a potentiometer, a 4-20 mA or 0-10 V signal or a pulse contact into a PWM output for LED and halogen lighting. Lower limit, upper limit and output speed are set with the potentiometers on the module. The dimming curve is adjustable too, so that LED lighting responds linearly to the control. Low-side switched, the lamp is connected between terminal 1 and terminal 2; high-side switched, between terminal 2 and terminal 6. All versions run on 9 to 30 V DC, deliver up to 5 A at 120 Hz and are suitable for an ambient temperature of 0 to 80 °C. The DIN rail enclosure measures 45 x 83 mm (board 42.5 x 72 mm). If you need galvanic isolation between input, output or supply, please contact us.

More about the PR804 series