AOpen DE7200 Series Instrucciones de operaciones descargar pdf (Pagina 71)

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31 Dec 13 5-9

DE-7200VFDCentrifuge

Leakage Compensation Test

A Magnahelic gage and hose kit available from Derrick is required to monitor cabinet pressure.

The leakage compensation valve adjustment should be checked for deviation from factory setting

as follows:

1. Connect Magnahelic gage to test point shown below.

2. Open the supply regulator to between 60 and 115 psi (4 and 8 barg) to start the purge flow.

3. Check that the internal logic gage reads 30 psi (2 bar).

4. At this time the ALARM/PRESSURIZED indicator should be green and the PURGING

indicator should be amber. If the amber indicator remains off, the flow through the relief valve

is below the minimum for which the flow sensor has been calibrated. Check the air supply

pressure at the inlet to the control unit while purging is taking place. It must be above the

minimum specified pressure.

5. The purge timer will start as soon as the PURGING indicator turns amber. Check that the time

delay between the PURGING indicator turning amber and the application of power to the

control cabinet is not less than the minimum time required for purging the cabinet. Times in

excess of the minimum are permitted, and a tolerance of +20% is normally acceptable. If the

time is too short it must be increased accordingly.

6. After power has been applied via the control unit the purging valve will close, and the air flow

into the cabinet will be controlled by the leakage compensation valve.

7. SLOWLY open the leakage compensation valve, and allow cabinet pressure to rise until the

relief valve opens. Check that the relief valve opens at or below 7” ±0.8” WC (17.4 mbarg ±2

mbarg).

8. Repeat the relief valve test several times.

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AOpen DE7200 Series Instrucciones de operaciones Pagina 71