Changing The Failsafe Direction And Write Protect Jumpers (Including Simulation Mode); Procedure To Establish Failsafe Operation - Honeywell SmartLine SLG 700 User Manual

4.5 Changing the Failsafe Direction and Write Protect Jumpers
(Including Simulation mode)
HART Transmitters are shipped preconfigured with a set failsafe direction (table V,
character 4 of the model number). Upscale Failsafe means that the Transmitter output will
set the HART 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.
Analog operation: Upscale failsafe drives the Transmitter output to above 21mA.
Downscale failsafe drives the Transmitter output to below 3.6mA.
When the Transmitter is in a failsafe condition, the digital process variable output should
be "Not a Number (NaN)".

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 Printed Wiring Assembly (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 4-3 for the locations of the failsafe and
write protect jumpers.
Turn OFF Transmitter power (Power removal is only required in accordance with
1.
area safety approvals and is only required in Class 1 Div 1 Explosion proof and
Class 1 Div 2 environments).
Loosen the end cap lock, and unscrew the end cap from the electronics side of the
2.
Transmitter housing.
If equipped with a Display module, carefully depress the two tabs on the sides of the
3.
Display module, and pull it off.
If necessary, unplug the interface connector from the Communication module. Do
4.
not discard the connector.
Note: The example diagram Figure 5-2 does not display the 8-pin interface connector.
The interface connector connects the Display module to the Communication
module. If this is not in place the display will not receive power.
Revision 8
WARNING: If the transmitter enters a downscale burnout status,
the transmitter enters a low power mode.
The transmitter must be reset to recover from this condition.
SLG 700 SmartLine Level Transmitter User's Manual
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