The devices uses a robust, epoxy moulded Transmitter Unit, mounted onto the rotor shaft at the diode bridge, where it receives its power from the field voltage and continuously measures for any leakage currents between field and earth.
During this stage, a signal is sent to the PT Unit (mounted on the end-frame) to indicate sufficient rotor voltage and healthy operation. During a failure in the rotor insulation, a modulated signal is sent to the frame mounted PT Unit and an alarm is activated on the Receiver Unit.
The Receiver Unit can be mounted anywhere on the machine or inside a control panel. Three outputs are available to indicate Receiver Unit power, Transmitter Unit power and a Rotor Earth Fault Alarm.
The REF Detector is designed for IP66 and operation in Zone 1 and Zone 2 hazardous areas is currently under development.