5 Service and maintenance
54 | 266 MODBUS® multivariable transmitter User manual 2105216 Rev. AB
Replacing the terminal block
The following procedure provides steps to replace the terminal block in the transmitter.
DANGER – Serious damage to health / risk to life. Hazardous voltages may be present at the transmitter if the
power source is not disconnected before opening the transmitter housing. Eliminate unnecessary exposure to live
electrical wiring by disconnecting the power supply at the source. Failure to disconnect power at the source can
cause death or severe injury from direct or indirect contact with live wires, or lead to indirect injuries resulting from
an electrical shock.
This procedure requires that power be removed from the transmitter at the power supply source.
1. Disconnect the power supply at the source.
2. Use the instructions in section 5.2.1, Removing the housing cover, to remove the rear housing cover, exposing the terminal
block.
3. Disconnect the following terminations from the terminal block in order(Figure 43):
a. Power
b. RS-485
c. RTD
Figure 43: Termination points
4. Remove the terminal block.
a. Remove the 2 fastening screws (Figure 44).
b. Pull the block out.
RTD
Power supply
RS-485
Communications
(+)
(-)
BLK
BLK
WHT
WHT
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