6500 Series Purge and Pressurization System
I/O Manual
49
• Bypass control
To access the bypass, the bypass password has to be entered.
BYPASS CONTROL PASSWORD BYPASS ENABLE NO, YES * FIXED/YES
BYPASS ON OFF, ON
BYPASS BEFORE
PURGE
OFF, ON
The bypass can be implemented one of two ways. Through the user-interface bypass menu or by a switch
input on the 6500 control unit. In either case, the BYPASS ENABLE must me ‘ON’ to implement the bypass
function. Once the ENABLE is ON, then a switch input (mapped to the input function) or by going into the
menu and selecting bypass on will activate the bypass.
FUNCTION ACTION
BYPASS ENABLE To allow the bypass to function, it must be enabled.
NO disables the bypass and cannot enable even if a switch input is on for
bypass.
YES allows the function to operate but if unit powers down and powers back
up, this enable will go back to NO.
FIXED/YES allows the function to operate and if the unit powers down and
powers back up, the enable will still be yes
AFTER PURGE ON Once the bypass is enabled, the bypass can only be active after the
enclosure has been purged or cleaned and the pressure is above the MIN
OVERPRESSURE
BEFORE PURGE ON Once the bypass is enabled, the bypass can be active before and after the
enclosure has been purged or cleaned. This allows users to commission
the system during start up when no protective gas supply is present. This
should only be done when the area is safe. This function is only available
through the menu and not the input switch. If unit powers down and powers
back up, this enable will go back to NO.
Danger!
This should be done only when the area is safe. Energizing the enclosure contacts before purging/cleaning
the enclosure and safe enclosure pressure is dangerous.
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