PWM2B – Isolated Dual Channel PWM to Analog Converter. Rev. 4

$45.00 – $55.00

This board houses two PWM* to 0-10V analog converters with full optical isolation between channels and controller. Suitable to control 3 proportional actuators, such as VFD** from a controller with PWM outputs (TTL/CMOS***).

Features

  • Adjustable output level
  • Optical isolation
  • Independent channels
  • Through hole components
  • Socket mounted ICs
  • Sturdy construction
  • Fits in standard DIN rail enclosure (optional)

*PWM – Pulse Width Modulation
**VFD – Variable Frequency Drive
*** TTL/CMOS – Transistor Transistor Logic/Complementary Metal-oxide Semiconductor

SKU: A002 Categories: ,

Description

This product contains two independent PWM (Pulse Width Modulation) to Analog converters. Each channel provides an output voltage proportional to the  DC (Duty Cycle) of the corresponding input signal. The intended application is to provide a galvanic isolated analog signal to control proportional actuators, such as VFDs (Variable Frequency Drives), linear actuators. proportional valves and other similar devices.

Most small micro-controllers do not have real D/A converters to produce analog outputs, instead they provide PWM signals that can be converted to analog values using an LP filter. This approach is good enough to generate 0-3.3V or 0-5V analog outputs (depending on the logic level of the controller) to control small powered devices, but is not suitable to interface with high power systems, such as VFDs or Servo controllers for electric motors.

Each channel accepts standard TTL level pulses  (5V) and provides adjustable 0 to 10V outputs (see specs below), which is a common standard for many industrial actuators.

Each channel is totally independent and optically isolated from the others and the controller.

When the actuator (i.e. VFD) provides its own “wetting” voltage (typically 10V), the converter can be powered directly from this supply bypassing the internal regulator. With this setting the maximum output voltage is equal to the power supply and no level adjustment is necessary.

The board is fitted with standard 0.2″ terminals and is available in two options:  With or without enclosure. The enclosure can be mounted in a standard DIN rail for easy integration in electrical cabinets. Alternatively you may order the enclosures directly from one of the suppliers listed below.

For one or three channels use the models PWM1B or PWM3B.

Specifications

  • Number of channels : 2
  • PWM input:   3.3V, 5V, 12V Selectable (New in Rev.4)
  • Output: Adjustable 0 to 5..12V, 1KOhm impedance
  • Linearity: 2% FSD
  • Isolation: Min. 500 Vac
  • Power: Nominal 24 Vdc  (Acceptable range 17 to 30Vdc)
  • Dimensions: 3.400 x 1.950 in. (87 x 50 mm)
  • Weight: 1.22 oz (0.025 Kg)

 Usage

Each channel is totally independent, therefore they can be connected to different controllers (if required). The same applies for the outputs.

Documentation

Enclosures

Enclosures for this board can be purchased through distributors or online at:

Lead time

Back orders ship usually in 2 weeks

Additional information

Weight N/A
Dimensions N/A
OPTIONS

BARE BOARD, DIN RAIL ENCLOSURE

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