AOpen DE7200 Series Instrucciones de operaciones descargar pdf (Pagina 72)

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5-10 31 Dec 13

DE-7200VFDCentrifuge

Minimum Pressure Sensor Setting

The setting of the minimum pressure sensor should be checked as follows:

1. Note the position of the leakage compensation valve knob by marking knob with a pencil at

the 12:00 o'clock position.

2. Slowly lower the cabinet pressure by closing the leakage compensation valve further, counting

the number of turns from the normal working pressure position. Note the pressure at which the

alarm/pressurized indicator changes from green to red, and check that this pressure is not

lower than 0.3” WC (0.75 mbar). Check also that the ALARM electrical contacts function

properly.

3. As soon as the ALARM/PRESSURIZED indicator turns red, the system will begin re-purging,

and the enclosure power will be switched off.

4. While the cabinet is re-purging, return the leakage compensation valve to its normal working

pressure position so that at the end of purging the cabinet pressure should immediately settle

down at the correct normal pressure.

Leakage Compensation Valve Adjustment

1. If a considerable quantity of air continues to flow out the relief valve after power has been

applied, the leakage compensation valve is open too far causing the air flow to hold the relief

valve open continuously. To correct this condition, slowly close the leakage compensation

valve. The cabinet pressure will start to fall as the flow decreases but eventually the relief

valve will close, and the cabinet pressure will rise again. At this point, the relief valve may start

to open intermittently as the cabinet pressure rises to the point where it exceeds the relief

valve opening pressure. When the relief valve opens, the pressure will fall quickly to the point

where the relief valve re-closes and the cabinet pressure starts to rise again.

2. If the relief valve is opening intermittently, the leakage compensation valve is open slightly too

far. When the relief valve opens, the cabinet pressure falls quickly to the point where the relief

valve re-closes and the cabinet pressure starts to rise again. Continue to close the leakage

compensation valve until the cycling stops and the cabinet pressure starts to fall. Carefully

adjust the leakage compensation valve until the cabinet pressure is stable. This pressure will

be the normal working pressure and should be about 7” WC (17.4 mbarg).

3. If, at the end of purging, cabinet pressure falls below the minimum pressure sensor setting,

the system will re-start a new purge cycle. This indicates excessive leakage from the cabinet.

In this case, check the cabinet for leakage, and reduce or eliminate the leaks. After sealing

cabinet, at the end of purging the cabinet should remain pressurized and the relief valve

action will occur as described in step 1 or 2, above. Proceed with adjustments described in the

preceding steps.

Note! When air conditioner goes off, the relief valve may vent momentarily.

This is normal.

Pressure Sensor Calibration

If it is decided that the minimum pressure sensor requires recalibration, it must be

returned to Derrick for this service.

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AOpen DE7200 Series Instrucciones de operaciones Pagina 72

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