Extrel MAX300-RTG - Page 52

MAX300-RTG: Installation Manual Hardware Installation
52
 Turn the main power switch to the ON position
 Verify that the turbo pump has come up to speed and no leak in the vent
valve is present by ensuring the green LED on the turbo pump is lit prior to
turning on the electronics (see LED conditions below). If the instrument will
be operated for some time with the door open, it can be safely operated with
the heater switch turned off. For optimum instrument performance, the
heater switch must be on before closing the door.
 The roughing pump oil level must be checked to ensure no bubbles are
present, indicating a possible vacuum leak
 Close the door and purge the enclosure once the system is operating
normally
 If the purge status indicator does not turn green, check the enclosure for
leaks and air supply for sufficient pressure
 If the area is hazardous:
 Before applying power to the unit, turn on the three switches inside the
upper right of the enclosure
 Close the front and side doors
 Begin the purge cycle. For Zone 1/Div 1 units, the purge control unit will
automatically connect power after purging duration is complete. For Zone
2/Div 2 units, apply power to the unit only after the initial purge time of 12
minutes is complete
 For Zone 1/Div 1 units, both yellow and green indicators will be visible when
air is connected. If there is difficulty obtaining either indicator, ensure that
all door latches are tight, and all ports into the enclosure are sealed. If
necessary, refer to the purge control documents supplied with the unit.
 For Zone 2/Div 2 units, the green indicator will be visible when compressed
air is connected. If there is difficulty obtaining a green indicator, ensure that
all door latches are tight, and all ports into the enclosure are sealed. If
necessary, refer to the purge control documents supplied with the unit.