34
7500 Series Manual
5.4 Setting Up the System
1. Ensure that the system meets all electrical, mechanical, and pneumatic connections before operation.
Refer to this manual and standards for explanation of requirements.
2. Apply power to the 7500 series system.
3. Program the 7500 system using the user-interface display on the front of the 7500 control unit. See
chapter 6 for instructions.
Note!
This step is for initial setup of the 7500 system. This procedure can be skipped if the 7500 control unit has
been programmed for the application in which it will be used.
4. Make sure the control valve is closed before applying pressure to the system.
5. Use a regulated pressure source to the valve. Set the regulated pressure to 30 psig (2 bar) or lower. Do
not exceed the maximum pressure for the valve and tubing that is being used.
6. The pressure should be below 0.1 in wc (0.25 mbar). Slowly open the needle valve on the control valve
system so that the pressure is above P1. If one of the automatic manifolds, 5500-MAN, is being used,
the solenoid valve will energize either before P1 or after. This depends on the purge program being used.
See chapter 6.5.
7. Check the EPV vent to make sure air is coming out of it. If not, check for any obstructions or improper
installation
8. The system is ready to operate.
5.5 Operating the System
1. Follow the preceding instructions for setting up the system.
2. For Programs 1 through 4 (hazardous gas environments), purging is required.
a. Seal the pressurized enclosure.
b. Set enclosure pressure to a value above P1.
c. When using the 5500-MAN… manifod, the manifold valve is connected to the SV1 output. When the
enclosure pressure is greater than P1, SV1 energizes the solenoid valve for purging. When using the
7500-MAN... or other manual valves, initiate the purging valve.
d. Adjust the regulated pressure so that enclosure pressure is above P3 (purging starts).
e. For the 5500-MAN or 7500-MAN manifold, after purging, the needle valve can be re-adjusted to the
user’s desire, but it must be above P1 value.
3. For Program 5 (hazardous dust environment), purging is not required.
a. The inside of the enclosure must be cleaned of all combustible dust.
b. The enclosure is sealed.
c. Adjust the enclosure pressure above P1. The minimum for P1 is 0.65 in wc (1.62 mbar) for hazardous
dust environments.
4. If enclosure pressure is above P1, power to the enclosure will be energized.
5. If enclosure pressure drops below P1, power must be disconnected. If power is to remain on, an alarm
must be initiated and located near an operator.
6. To energize the pressurized enclosure again, repeat the above sequence.
Danger!
All 7500 pressurization systems require EPV-7500... vents for pressure relief.
Danger!
When accessing the user-interface display, the area must be free of hazardous gas and/or combustible dust.
The lid to the 7500 housing must be attached and propertly tightened for operation in a hazardous area.
Note!
At ambient temperatures below -20 °C, the display of the 7500 control unit may not be visible. However, the
unit and LED indicators will still function properly.
To Next Page
Loading...
Need help?
General
