Siemens Remote Displays SITRANS RD100 - Manual (Page 11)

7ML19985JU01 SITRANS RD100 – INSTRUCTION MANUAL Page 9
further details. Wall mounting holes are located in each corner of the enclosure (see
Mounting on page 4).
Loop connections
Disconnect power to the loop and install the meter as illustrated in Control loop
connected to input signal PCB on page 6 and Removing display PCB from the loop on
page 9. Replace the enclosure cover.
Removing display PCB from the loop
The display PCB and input signal PCB are connected together with one black and one red
wire. The wires are soldered to the display PCB and connected to a screw terminal
connector on the input signal PCB.
1. Remove enclosure cover and the display PCB as described in steps 1 to 3 of
Calibration connections on page 8.
2. Install loop jumper over both pins to bypass display PCB and allow the signal to flow
through the loop jumper. The display turns off when jumper is installed.
3. Disconnect the black and red signal wires from the screw terminal connector.
4. Loosen completely the right-side screw and lift display PCB from enclosure.
5. Restore enclosure cover to the base to prevent contamination of components.
Restoring display PCB to the loop
1. Loosen the four screws on the enclosure cover and remove the cover.
2. Secure display PCB to enclosure using right-side screw; do not tighten screw to
allow rotation of display PCB while accessing input signal PCB.
3. Connect red wire to S+ terminal and black wire to S- terminal, as shown in
Calibrator connected to input signal PCB on page 6.
4. Remove loop jumper to allow the signal to flow through display PCB (save push-on
jumper by placing over one pin only).
5. Tighten screws holding display PCB and install enclosure cover.
Servicing display PCB outside the loop
Two modes of input signal allow the user to remove the display PCB for service without
interrupting the loop as indicated above and operate the display PCB at another location
in a non-hazardous area. The loop remains connected to the input signal PCB while the
display PCB is absent for service. The user may operate the display PCB at another
location by connecting a signal to “S+” and “S-” wires on the display PCB. Refer to
Calibrator connected to display PCB on page 7.
CAUTION: Care should be taken to prevent static electricity from
damaging the electronic circuitry.