The MSC500A Controller has a rotational on/off switch and provides: one switched, uncontrolled output, and one switched output which is controlled electronically to provide stepless speed control for single phase PSC motors, or shaded pole motors, in fan applications.

2 amp, 240 volts, 50/60Hz, 500VA.
Derate at 20VA per degree C above 40 degrees.
Maximum controller case temperature 70 degrees C.

Inbuilt rotational on/off switch integral with speed adjusting shaft. Able to switch 2 amps, 240VAC.

Three 6.35mm electro tinned quick connect terminals. Leads are optional.

Screwdriver adjustment over a wide range of motor speed.

9.6mm (3/8 inch) diameter metal bush for panel mounting. Nut 32 TPI.

This controller is fitted with an Electromagnetic Interference suppression network and complies with the requirements of AS/NZS1044:1995 when correctly installed. See data sheet for installation requirements.

Designed and manufactured in Australia using high quality components, Powerform controllers are built for long service life.

Stepless speed control of most permanent split capacitor, shaded pole and universal motors, when driving fans or centrifugal pumps.

The MSC500A controller varies the AC voltage supplied to a PSC induction motor. In normal fan and pump applications, the motor will slow as the voltage is reduced by the controller. If a large change in speed is required, the motor must be of a type suitable for speed control.

Motor selection
Ensure that the motor to be controlled is suitable for speed control. For some PSC motors, the controller must be inserted in series with the main winding of the motor, leaving the capacitor winding (start winding) permanently across the 240VAC line. To do otherwise could cause motor damage.

Minimum Speed Adjustment
The knob on the controller will vary the motor speed between full speed and a minimum speed. The minimum speed is set after the controller has been installed, by turning the front knob fully anti-clockwise and then carefully adjusting the minimum speed trim potentiometer (blue) at the side of the controller until the required lowest speed is reached. Turning the trim pot anti-clockwise will reduce the minimum speed setting. Ensure that the minimum speed selected allows sufficient air flow across the motor to prevent it from overheating.

Electromagnetic Compliance
When properly installed, the MSC500A controller meets the Electromagnetic Compliance (EMC) requirements of Australia. Correct installation requires that the conductor between the controller and the motor main winding be screened (shielded), and that the screen be earthed at one point. If more convenient, the screening may be accomplished by enclosing all the cables between the controller and motor in an earthed screen. Note that the cross-sectional area of the screening on a single cable is not normally sufficient for it to be used as an earth conductor

WIRING DIAGRAM
The following wiring diagram indicates how the controller may be installed.
Earthing The controller must be installed in accordance with AS3000. AS3000 requires that the case of the controller be earthed unless the controller is "not accessible to personal contact". A knob fitted to the controller shaft is isolated from the metallic case of the controller by the plastic shaft of the controller.