Datasheet W181A-P500

Valve and motor drivers (PWM)

Issued 3 November 2026

PT100 to PWM for fan or heater, high-side switched, with OLED display

Article number W181A-P500

W181 module in compact DIN rail enclosure, front three-quarter view: OLED display, three push buttons, DIP switch, USB-C port and screw terminals

The W181A-P500 measures the temperature with a PT100 sensor and uses it to drive two PWM outputs, high-side switched. Below a start temperature the output is at an adjustable minimum, above an end temperature at the maximum, and in between it rises evenly. This way a fan runs only as fast as needed, or a heater keeps a room or cabinet at temperature. Start and end temperature and the minimum and maximum are set on the OLED display.

Price on request. Supplied in series, from 10 units per item. Not in stock? Then we build your series. One or a few units only as a trial, for a company with a series in sight.

Specifications

Supply24 V DC (±15 %)
InputPT100, 2-, 3- or 4-wire
Measuring rangeAdjustable, for example 0 to 100 °C
OutputTwo PWM outputs, high-side switched
IsolationNot galvanically isolated
SetupOLED display with UP, DOWN and OK buttons; DIP switch for basic choices
ControlStart and end temperature and output minimum and maximum adjustable
USBUSB-C for software updates and reading the status
Wi-FiBuilt-in hotspot for software updates
MountingDIN rail, compact enclosure
Internally fitted withPR181T23 and PR181s10

Setup

  1. Connect the supply, the PT100 and the fan or heater according to the wiring diagram supplied with the module.
  2. Set the start and end temperature on the display.
  3. Set the output minimum and maximum and store the settings.