Instruction manual

Power-Supply and Sensor Wiring
continued
RFT9739 Rack-Mount Transmitter Instruction Manual 21
Output Wiring Startup TroubleshootingBefore You Begin Getting Started Mounting
Power-Supply and
Sensor Wiring
Fuses
Fuses for the power-supply input are located inside the transmitter
housing on the power board. The transmitter has two fuses: one for an
AC power supply and one for a DC power supply.
• The AC power supply uses a UL/CSA 250mA/250V, time-lag, 5x20mm.
• The DC power supply uses a UL/CSA 2A/125V, time-lag, 5x20mm.
To access the AC-power fuse, remove the top cover. To access the
DC-power fuse, remove the bottom cover. Locate the power board. The
locations of the fuses on the board are indicated in
Figure 4-3
, page 21.
4.3 Changing power-supply
voltage
A switch labeled S1, located inside the transmitter on the power board
(see
Figure 4-3
), allows the AC power-supply voltage to be changed.
When switching from AC to DC power:
1. Remove the AC power wiring.
2. Properly install the DC wiring.
When switching AC voltage, or when switching from DC to AC
power:
1. Turn off power, then detach the existing power-supply wiring.
2. Remove the transmitter top cover.
3. Locate the power board. The location of switch S1 is indicated in
Figure 4-3
.
4. Set switch S1 to the appropriate position (115V or 230V), then
replace the top cover on the housing.
5. Mark the newly configured voltage on the label on the transmitter
back panel.
6. Properly install the new wiring.
Figure 4-3. Fuses and power-select switch
2 amp/125 V fuse for
DC power supply
Power board
Switch S1 for AC
power-supply voltage
250 mA/250 V fuse
for AC power supply