6500 Series Purge and Pressurization System
I/O Manual
60
13 Maintenance & repair
1.
Warning!
to the factory for replacement/repair.
2. The 6500 purge and pressurization system, when operated in conjunction with a hazardous area, must not
Pepperl+Fuchs specialist who is specially trained and authorized to repair the defect.
3.
4. When servicing, installing, and commissioning, the area must be free of all combustible material and/or hazardous
explosive gas. Only the terminal compartment of the control unit is accessible to the user. Not under any
circumstances shall the control unit, user-interface, or vent be taken apart.
5. Any cable glands that require replacement shall be replaced with the same model or another approved cable gland
6. For the 6500-01-EXT1-… control unit, the cable from the user-interface must be placed in the control unit on the I.S.
side of the physical barrier.
Contact customer service for an RMA (Return Merchandise Authorization).
14 Alarm and Fault Conditions
The 6500 purge controller can indicate certain alarm and fault conditions when they happen. The alarm condition
is indicated on the display under the Alarm/Fault LED and will blink for alarm and solid for fault. The alarm will not
disengage enclosure contacts if they are on but can be directed to the AUX alarm contacts. The fault will disengage
enclosure contacts.
Below are the alarm descriptions:
Alarms Description Cause
NO SAFE PRESSURE Enclosure pressure is below minimum
safe pressure
- No purge supply
- Enclosure leakage too great
MAX PRESSURE Enclosure pressure is above the
maximum pressure allowed
- purge supply pressure too much
- EPV-6500 vent is blocked or not
installed
LOW PRESSURE Enclosure pressure is below the
alarm pressure but above the min
safe press.
- Purge supply capacity is not keeping
up
- Enclosure is starting to leak more
INPUT 1 BROKE/SHORT When SRM is selected, then a wire is
broke or shorted going to the switch
input
- SRM is selected and not installed on
the switch input
- Broken or shorted wire to switch/
SRM or proximity sensor
Py ENCL PWR ALARM Activates only when ‘py’ selected
and enclosure pressure drops below
minimum safe pressure
- no purge supply
- Enclosure leakage too great
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