LEFM 3xxCi User Manual
IB1406 Rev 12
Section 7
Page 50
February 2017
10.
Reattach all user terminations or terminal blocks. Confirm that all connectors’ flanges are
tightened and all terminations are in a secure condition.
11.
Screw the rear lid of the enclosure back on. This should be hand tight with at least 8 full turns of
the lid. Tighten the setscrew on the lid.
7.5
CTC and Display Replacement
Figure 7.4 Disassembly Views for CTC and Display Replacement
Never open the transmitter when the instrument is energized. Before inspecting components,
open the power supply circuit breaker. Failure to do so may result in electrical shock and/or an
explosion if in a hazardous area.
The transmitter has a real time clock that has battery backup. It is recommended to replace the
complete circuit board if the battery ever fails. Do not replace the battery alone. It must be
replaced with the identical battery and it must never be changed in a hazardous location area.
The CTC and Display assembly consists of two component boards. The individual component boards are
not designed for individual replacement. Rather, if any component on the CTC and Display assembly fails,
the entire assembly is to be replaced.
To replace the CTC and Display assembly, perform the following steps, referring to Figure 7.4 for hardware
locations.
1.
Loosen the 2mm hex set screw on the front enclosure. Unscrew and remove the front cover from
the transmitter.
Use proper grounding straps on personnel before handling any circuit boards.
WARNING
WARNING
CAUTION