Description
The Hoffman Controls 792-ECM(VmA) Controller is designed to vary the speed of an EC Motor via a Pulse Width Modulated (PWM) signal. The output current capacity is sufficient to drive a single motor input (5mA).
The controller will accept either a 2-10 VDC or 4-20 mA input signal. The PWM output signal will scale from 0% to 100% over the input signal range.
A manual speed adjustment is also provided and will allow for 0% to 100% PWM output over its adjustment range. This manual speed adjustment can also be used to provide a continuous minimum speed when using the VDC or mA input.
Specifications
- Input Voltage: 24VAC (+20%/-10%)
- Input Signals: DC Volts 2–10VDC
- Input Impedance 10,000 Ohms Min.
- DC milliamps 4–20mA DC
- Input Impedance 500 Ohms
- Output: 0% to 100% PWM @ 80Hz
- 13.5 VDC, 5mA (max.)
- Operating Ambient: 32ºF to 120ºF
- Humidity: 95%, non-condensing
- Dimensions (L x W x H): 2.50” x3.00” x 1.25”
Applications
Variable Speed Control
Variable speed control can be used when operation over the entire speed / flow range of the motor is required. When using the variable speed control signal (2-10 VDC or 4-20 mA), the motor will automatically turn off when the signal drops below the minimum input level (2 VDC or 4 mA).
Manual Speed Control
Manual speed control may be used when operation at a single fixed speed / flow point of the motor is required. Once adjusted to the required speed / flow point, ON / OFF operation can only be achieved by removing power from the controller or the motor. The manual speed adjustment can be used in conjunction with the variable speed control to provide continuous flow as required
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