High Service Pumps are widely used in wide varity of water utilities. These pumps typically have Very great in siz. The pumping capacity and are driven with high horsepower motors. While they normally operate reliably, unchecked backpressure can lead to severe pump damage when a pump is started during a reverse rotation condition.
To help prevent this problem, Precision Robotics & Automation developed the PRD-2K to detect shaft reversal in pumps. The system features a failsafe reversal switch that constantly monitors a pump shaft to assure that it's turning in the correct rotational direction.
Relay contacts in the unit can be used to electrically lock out the starting circuit of the pump to prevent accidental start-up during a condition of reverse rotation. The device is supplied with a custom-machined split collar magnetic pulser wrap that is designed to clamp tightly around the pump shaft.
Because the PRD-2K is failsafe, a power failure would de-energize the relay. This means the starting circuit to the pump motor would be disabled. Upon restoration of power, the PRD-2K relay resets but would instantaneously switch out again if it detected a shaft reversal, thus preventing the pump motor from starting during a reversal condition.
It also displays the speed of rotation of the shaft in RPM in both side.
Microcontroller based intelligent rotation shaft detection.
High precision sensor for detection.
Relay changes state when shaft direction reverses
Relay resets when reverse motion stops
Audio and Visual Alarm output.
When the pump stops turning in reverse, the system automatically resets itself to allow a normal, safe start-up.
Front Panel settable of reverse rotation condition
On power failure, starting circuit to the pump motor would be disabled.
Preventing the pump motor from starting during a reversal condition.