Chapter Four: Operation in Normal Mode How To Command an MFC Close Override
121
How To Command an MFC Close Override
A mass flow controller (MFC) moves to full close from any position within two seconds when
commanded with a close 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 close within 2
seconds.
Note
1. The close override provides a fully closed condition, and in most
cases can be used to zero the MFC (zero flow).
2. 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.
How To Cancel an MFC Open/Close Override
An open or close override is canceled with the same sequence of steps.
1. Repeatedly press the [
DISPLAY MODE
] key until the 146 unit is in Normal Mode.
The system responds by scrolling through modes.
2. Press either the
or key, followed by [
OFF
/
GAIN
], then [1], [2], [3], or [4].
The system responds by removing the open or close override for the MFC on the selected
channel. The MFC then performs as if no override had been given.
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