7 Operation
4310014218/00 EN
7.2.4 Resetting via the BPM (rotary knob) bypass (optional)
Resetting via the BPM bypass is performed directly on the device.
Figure19: BPM bypass
1 Rotary knob
ü Under normal operating conditions, the bypass is closed.
1. NOTICE! Damage to the BPM bypass. Do not use force to turn the knob
further than is possible.
2. Turn the knob counterclockwise so that oil flows from the conservator-side
chamber into the tank-side chamber via the bypass.
ð As soon as the pressure difference has been equalized fully, the float
opens the main valve, the status of the reed switch changes and a
signal is sent to the monitoring circuit of the transformer.
3. Turn the knob clockwise to establish normal operating conditions.