AOpen DE7200 Series Provozní pokyny stáhnout pdf (Strana 40)

OPERATING INSTRUCTIONS

4-2 30 Sep 13

DE-7200VFDCentrifuge

TOP COVER OPENING/CLOSING PROCEDURES

The proper procedures for opening and closing the top cover of the centrifuge must always be

followed. Two operators using both hands are required to open the cover. Derrick recommends

having a hoist available if additional assistance is desired during the opening/closing of the

centrifuge cover. To open and close the cover, proceed as follows:

1. Shut down, lock out, tag out electric power to centrifuge, and allow rotating assembly to coast

to a full stop.

2. Remove bolts securing cover to base.

3. Have two operators using both hands grip the cover handles securely to ensure full control of

the cover throughout the opening and closing process.

4. As the cover is raised, ensure that body limbs of all personnel and any other items remain

clear of the cover gap at all times.

5. Raise the cover to the fully opened position, and insert a 1/2” (12.7mm) hardened steel pin

through one hinge to lock the cover open.

6. After performing the activity that required the cover to be opened, reverse steps 2 through 5 to

close the cover. During the closing procedure, ensure that both operators are capable of

controlling the cover’s descent and that all body limbs and other items remain clear of the gap.

PURGE SYSTEM (HAZARDOUS ENVIRONMENT ONLY)

During startup, the control cabinet purge system drives out all gases from the cabinet interior and

then maintains positive pressure within the control cabinet to prevent entry of any potentially

explosive gases. Purge system operation begins when the system senses sufficient air pressure

inside the cabinet. Initially, the purge unit performs a 16-minute rapid purge cycle at 16 CFM.

During the rapid purge cycle, the purge system prevents application of electric power to the

cabinet. At the end of the rapid purge cycle, the purge system closes the main electrical

contactor, allowing electric power to flow to the cabinet. The centrifuge may then be started.

After the rapid purge cycle, the purge system maintains positive pressure within the cabinet to

prevent entry of hazardous gases, automatically compensating for pressure loss due to cabinet

leakage. If at any time a loss of cabinet pressure is detected, the main contactor opens

immediately, disconnecting power. If a shutdown occurs during centrifuge operation, the purge

system performs another 16-minute rapid purge before power is restored to the cabinet.

Purge System Bypass

DANGER! EXPLOSION HAZARD! BE CERTAIN THAT SURROUNDING

ATMOSPHERE IS CLEAR OF ALL POTENTIALLY EXPLOSIVE GASES BEFORE

OPENING CONTROL CABINET DOOR.

If the control cabinet is located in a non-hazardous environment, the purge system may be turned

off. A high risk of fire and/or explosion will result if purge system is bypassed in a

hazardous area. Also, with the purge system bypassed, the centrifuge will remain energized if

the control cabinet door is opened. Consequently, use extreme caution when operating the

equipment or performing any procedure with purge system bypassed. If the control cabinet

is moved to a hazardous environment, the bypass must be removed and satisfactory purge

system operation confirmed.

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