GE Industrial Solutions Entellisys Device Replacement Guide - Manual (Page 33)

Removing the RS232/485 converter 33
6
6 Replacing an RS-232 to RS-485 converter
6.1 Removing the RS232/485 converter
NOTE: Disconnecting the RS232/RS485 converter disables the communication between the
HMI and UPS or between the synch clock and CPU B.
1. Before proceeding, if the converter is mounted on a bracket with a CPU chassis, remove the
chassis following the appropriate instructions. Note that the bracket does not need to be
removed from the compartment wall.
WARNING! Voltages hazardous to personnel are present.
2. Open the instrument compartment. Locate the 12 Vdc terminal block or power supply that
the converter derives its power from.
3. Disconnect the power by removing the three wires connecting the converter to the 12 Vdc
terminal block.
4. Disconnect the 9-pin plug by loosening the screw locks and pulling the plug out of its socket.
5. Remove the three power wires from the converter by loosening the screw locks on the
terminal block with a screwdriver.
6. Locate and label the two communication wires at the converter.
7. Remove the two communication wires at the converter by loosening the screw locks on the
terminal block with a screwdriver.
8. Remove converter by removing the nuts and washers from the surface-mount studs or by
removing the bolts and washers from the mounting surface.
9. Remove the converter from the mounting surface.