Air Products Gasguard 250, Руководство по установке

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Section 4: Electrical Connections
Revision D: June 1997 Page 4 - 7
Recommended External I/O Communications
Digital Outputs Response
Gas unavailable
Branches A-D
(also E-H on dual controllers) Notify process tool that gas is
unavailable
Digital Inputs Response
Vent system unavailable Prevent purge modes from starting.
Branch Shutdown (Process tool down)
Branches A-D
(also E-H on dual controllers) Prevent branch from flowing process
gas
Remote Emergency Stop
(Process gas leak, facility shutdown) Shut down VMB
Process gas unavailable from gas
cabinet Prevent process gas flow from VMB.
Note: The VMB controller will be configured as described above
unless specific changes are agreed to by the customer and Air
Products. The specific I/O for this system are found on drawings
in the Appendix. Digital inputs that are programmed for use but
not installed by the customer may require installation of jumpers in
the controller or VMB terminal strips.
The GG250 System is equipped with a "vent
unavailable" feature which prevents process
gas from being vented from the panel if the
scrubber system is not operating. Utilization of
this feature requires the installation of a
hardwire between the controller and the
scrubber. Failure to utilize this feature may
result in the discharge of process gas to a non-
functioning vent system.