3 Channel PWM to Analog Converter

PWM3B – Isolated 3 Channel PWM to Analog Converter

$63.00 – $75.00

This board houses three 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 (not supplied)

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

SKU: A003 Categories: ,

Description

This product contains three 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 galvanically 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 two channels only use the models PWM1B or PWM2B.

Specifications

  • Number of channels: 3
  • PWM input:    TTL level. Max frequency 1 KHz (up to 10Khz with reduced linearity)
  • Output: Adjustable 0 to 5..12V. Impedance 1 KOhm
  • Linearity: 2% FSD
  • Isolation: Min. 500 Vac
  • Power: Nominal 24 Vdc  (Acceptable range 17 to 30Vdc)
  • Dimensions:
    • Bare board 3.4 x 2.7 x 0.65 in. (87 x 69 x 16 mm)
    • Enclosed: 3.5 x 2.8 x 2.3 in ( (89 x 72 x 58 mm)
  • Weight: 1.7 oz (0.055 Kg)

Usage

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

Instructions

Enclosures

Lead time

Back orders ship usually in 2 weeks.

Additional information

Weight 150 kg
Dimensions 20 × 15 × 10 cm
OPTIONS

BARE BOARD, DIN RAIL ENCLOSURE

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