How To Command an MFC Open Override
Chapter Four: Operation in Normal Mode
120
Adjusting the Upper Point of The Analog Set Point Input Voltage Range
The analog set point feature does not need to be enabled to allow a change in the upper point of
the analog input voltage range. However, the feature must be enabled to allow the 146 unit to
control with an analog set point (refer to Code 15x: How To Set Up Analog Set Point in the
Operation in Setup Mode chapter).
1. Repeatedly press the [
DISPLAY MODE
] key until the 146 unit is in Normal Mode.
The system responds by scrolling through modes.
2. Provide an analog input equal to the desired full scale voltage input.
3. Press the [
SPAN
/.] key, followed by the [
DEGAS
/
SET POINT
] key.
The system responds by setting the full scale voltage (the upper point of the analog set
point input range), equal to the current analog input. The lower point of the input range
remains fixed. The slope of the analog input voltage versus analog set point line
changes.
How To Command an MFC Open Override
A mass flow controller (MFC) moves to full open from any position within two seconds when
commanded with an open override.
1. Repeatedly press the [
DISPLAY MODE
] key until the 146 unit is in Normal Mode.
The system responds by scrolling through modes.
2. Press the
key, followed by [1], [2], [3], or [4].
The system responds by moving the MFC on the selected channel to full open within 2
seconds.
Note
You must use the appropriate CB147-X cable, listed in Table 20, page
64, to enable the MFC override commands. The CB259-5 and CB259-
10 cables do not support the open and close override commands.
However, using these cables will not damage either unit.
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