39
1ZSE 5492-118 en, Rev. 4
TC_00264
6 Pressure relay
6.3 Checking at commissioning of the transformer
1. Set the valve handle in the test position as shown on the information plate.
2. Connect the air pump and the pressure gauge to the test tap on the pressure relay.
3. Raise the pressure until the pressure relay trips the circuit breakers for the transformer.
4. Read the pressure on the manometer and check against the pressure stated on the
information plate. Max. permitted deviation is ± 10 %.
5. Check that the alarm signal disappears when the pressure is lowered.
6.
After finishing the check, turn back the valve handle to service position.
Valve handle
Test tap (R 1/8”)
Information
plate
Fig. 34. Pressure relay.