6500 Series Purge and Pressurization System
I/O Manual
39
7.6 Setup procedures for standard applications:
1. Ensure that electrical, mechanical, and pneumatic connections and requirements are met to operate
this system. Please refer to this manual and applicable standards/codes, including current edition of
supplied through a switch or circuit-breaker to provide a method of disconnect from the supply source.
2. Do not connect a protective gas supply to the system or turn it off for setup.
3. Apply power to the 6500 system.
4. Define the 6500 system parameters in the menu structure for the application. Refer to ‘Programming
Menu’ for instructions.
5. Set the user-interface on the 6500 control unit to pressure for indication of enclosure pressure.
6. Turn on the protective gas supply. Set the regulator to its lowest setting and then gradually increase
pressure. When starting any system, it is best to start slowly to make sure the EPV-6500 vent is
connected properly for pressure relief by checking to make sure the purge gas is exhausting from the
enclosure. Do not exceed pressure ratings of the system.
If the unit is in the ‘SA’ (semi-automatic mode), then purging will not automatically begin. Beware that
if the unit is in ‘FA’ mode, as soon as the enclosure pressure is greater than the min overpressure,
purging will start. The unit is default from factory in ‘SA’ mode.
8. The system is ready to operate.
For dilution application, the procedures will be the same but the flow rate will be the set-point desired
for operation of the system. The user-interface display can be scrolled to show flow rate. Note that the
desired flow rate required must be greater than the min overpressure set-point to operate.
7.7 Operation for standard applications:
Gas hazardous location
• Follow setup procedures in this section
• Seal enclosure
• Pressure is set to a value above the minimum overpressure set-point in the user-interface menu for
purge settings. This pressure can be set below 0.88 mbar (0.35” wc).
• Depending on how the purging is selected (SA or FA mode), purging the enclosure is required.
• After a successful purging, with the pressure in the enclosure above the minimum overpressure set-
point, the enclosure is considered safe, and power to the enclosure can be energized.
• If the enclosure pressure drops below the minimum overpressure set-point, then action is required.
For ‘pxb,’ enclosure contacts have to be de-energized. For ‘pyb,’ enclosure contacts can remain on but
an alarm must be initiated (this is done through the AUX contacts on the 6500 control unit).
Combustible dust locations
• The pressurized enclosure must be cleaned out of all combustible dust and sealed. Purging cannot be
done to clean out the pressurized enclosure.
• Set the enclosure pressure above the minimum overpressure set-point. Minimum pressure is 0.88
mbar (0.35” wc).
• With the enclosure pressure above the minimum overpressure set-point, it is considered safe, and
power to the enclosure can be energized.
• If the enclosure pressure drops below the minimum overpressure set-point, then action is required.
For ‘pxb,’ enclosure contacts have to be de-energized. For ‘pyb,’ enclosure contacts can remain on but
an alarm must be initiated (this is done through the AUX contacts on the 6500 control unit).
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