Changing The Default Failsafe Direction; Procedure To Establish Failsafe Operation; Figure 59 - St 700 Basic Transmitter - Locating The Failsafe And Write Protect Jumpers - Honeywell ST 700 User Manual

13.4 Changing the Default Failsafe Direction

ST 700 Basic Transmitters are shipped with a default failsafe direction of upscale. This means that the
Transmitter output will set the current output to upscale failsafe (maximum output) upon detection of
a critical status. You can change the direction from upscale failsafe to downscale failsafe (minimum
output) by moving the top jumper located in the Electronics module.

13.4.1 Procedure to Establish Failsafe Operation

The failsafe direction display accessible via the Toolkit shows only the state of the
jumper as it correlates to analog Transmitter operation.
The integrated circuits in the Transmitter PWA are vunerable to damage by stray static
discharges when removed from the Electronics Housing. Minimize the possibility of static
discharge damage when handling the PWA as follows:
Do not touch terminals, connectors, component leads, or circuits when handling the PWA.
When removing or installing the PWA, handle it by its edges or bracket section only. If you
need to touch the PWA circuits, be sure you are grounded by staying in contact with a
grounded surface or by wearing a grounded wrist strap.
When the PWA is removed from the Transmitter, put it in an electrically conductive bag, or
wrap it in aluminum foil to protect it.
The following procedure outlines the steps for positioning the write protect and failsafe jumpers on
the electronics module. See Figure 59 for the locations of the failsafe and write protect jumpers.
Figure 59 – ST 700 Basic Transmitter - Locating the Failsafe and Write Protect Jumpers
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ST 700 SmartLine Pressure Transmitters User's Manual
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