MKS 651D Series, Руководство пользователя, Страница: 66 / 162

Setup Chapter Four: Local Operation
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BACKFILL / RELAY2:
ENAB DISAB
The Backfill Valve Control feature can open a pneumatic valve to assist in raising the system
pressure to a new setpoint.
Note: When the backfill valve control feature is enabled, process relay 2 is disabled. When
backfill valve control feature is disabled, relay 2 is enabled. These features share the same pins
on the I/O connector.
Select the Backfill and Relay2 configuration. (ENAB/DISAB or DISAB/ENAB)
8.* Press the [ ] key to advance to the next screen.
The screen displays:
MINIMUM DELTA P:
.10000 Torr
This value is the required difference between the new set point and the current pressure in the
system before the backfill control feature operates. Set point changes less than the backfill
threshold value do not trigger the backfill function.
Enter the Minimum Delta P value, range is 0 to High Sensor range.
9.* Press the [ ] key to advance to the next screen.
The screen displays:
SETPNT BACKFILL LIM:
50.0 % of SETPNT
This parameter sets the point at which the backfill valve closes (the relay deactivates) and the
feature turns off. When the feature is turned off, a new setpoint must be entered before the
feature can be enabled. The value of this entry is defined as a percent of the new setpoint value.