Replacing The Communication Module; Figure 24 - Pwa Replacement - Honeywell SmartLine ST 800 User Manual

5.4 Replacing the Communication Module

The communication module includes a connector to the sensor ribbon cable and a connector to the
optional display module. This section includes the procedure to replace the communication module.
The transmitter does not have to be removed from service to replace the comm module
Please take appropriate steps to avoid ESD damage when handling the communication
and display module assemblies
Refer to Figure 24
1. Turn OFF transmitter power (Power removal is only required in accordance with area safety
approvals. Power removal is only required in Class 1 Div 1 Explosionproof and Class 1 Div 2
environments).
•
When removing the communications module with power applied, the loop will go to 0V.
Likewise, installing a communications module into a transmitter with power applied will
cause the loop output value to go to 12 ma for several seconds then the loop output value
will go to the configured value based on the PV input.
•
Installing a display module into a powered transmitter may cause a temporary upset to the
loop output value.
2. Loosen the end cap lock and unscrew the end cap from the electronics side of the transmitter
housing.
3. If equipped with a display module, carefully depress the two tabs on the sides of the display
module and pull it off.
4. If necessary, unplug the interface connector from the communication module. Do not discard the
connector.
5. Loosen the two retaining screws, and carefully pull the communication module from the
Electronics compartment.
91
for parts locations.
Figure 24 – PWA Replacement
ST 800 Pressure Transmitter User's Manual
Revision 15