Sterling 882.00268.00 specifications Standalone Control Operation

5-2 Standalone Control Operation

The Stand-Alone Control is provided with RPV models B and D and is used with central vacuum system operated vacuum hoppers. The Stand Alone control box has these features:

Power Switch

The power switch on the stand-alone box must be in the ON position during operation. If the power switch is turned off during operation, the RPV will stop conveying and the central vacuum system will sense a high vacuum condition and initiate a blowback cycle.

Fuse Holder

The 2-amp fuse for the Stand-Alone Box is conveniently located on the faceplate of the enclosure and can be easily replaced. Keep a spare fuse on hand.

Conveying Time Range Selector Potentiometer

The conveying time range can be set in seconds, minutes, hours, or tens of hours by turning the unit selector potentiometer (or pot) located in the lower right corner of the timer face.

Timer Dial Increment Selector Potentiometer

The timer dial increments may be set by turning the increment selector potentiometer (or pot) located in the lower left corner of the timer face.

Material A Timer

The conveying time for Material A is controlled by dialing the orange or ON axial dial to the desired time.

Material B Timer

The conveying time for Material B is controlled by dialing the yellow or OFF radial dial to the desired time.

Note: Due to the variance of flow characteristics between different materials, the ratio set by the two material dials will not necessarily provide the same ratio of material. Some adjustment of convey times may be necessary to achieve the desired mixture. See Section 5-4 on page 24 for an explanation and a method of determining and tuning actual conveying rates.

Remote Proportioning Valve Chapter 5: Operation 22 of 30