Chapter Five: Operation
How To Disable a Trip Point
77
How To Disable a Trip Point
Refer to The [TRIP POINTS] Key, page 54, for a complete description of trip points.
•
Setting the trip point high entry to +105% of full scale disables the trip point
•
Setting the trip point low entry to -105% of full scale disables the trip point
For example, if the sensor range is set to 1000 Torr, and you wish to disable the high trip point,
set the trip point high entry to 1050 Torr. To disable the low trip point, set the trip point low
entry to -1050 Torr.
How To Clear a Latched Trip Point
Refer to The [TRIP POINTS] Key, page 54, for an explanation of the trip points, and the
latching feature.
A trip point latch can be enabled through the
TRIP POINTS
menu screen on the front panel, or
through a remote communications command. Follow this procedure to release a latched trip
point and maintain the latch as enabled. Once the latch is cleared, the trip point will become
latched again should the pressure cross a trip point.
1. Place the Key Lock switch in the
REMOTE
position.
2. Connect the I/O connector pins, as described in Table 17, to clear a latched trip point(s).
Connections to Latch the Trip Points
To Latch Trip Point:
Connect Pin:
To Pin:
A
10 (latch TP A)
4 (digital ground)
B
9 (latch TP B)
4 (digital ground)
Table 17: Connections to Clear a Latch on the Trip Points
Maintain this connection for at least 100 milliseconds to clear the latch on the
appropriate trip point.
3. To release the clear signal, release the connection, so the pins float high.
Refer to Table 9, page 37, for the complete list of pin assignments for the I/O connector.
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