Precision Digital Corporation PD6770-0K0, Инструкция по эксплуатации

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PD6770 Field-Mount Loop-Powered Process Meter
Instruction Manual
8
Connections
To access the wiring connections, remove the enclo-
sure cover and unscrew the two captive screws that
fasten the display module. Remove the display mod-
ule. Signal connections are made to a three-terminal
connector on the rear of the display module.
S+
4-20 mA signal positive terminal
connection
S-
4-20 mA signal return/negative terminal
connection
B-
4-20 mA signal return/negative terminal
when using the installed loop-powered
backlight option.
Refer to
Figure 3
for terminal positions.
• Observe all safety regulations. Electrical wiring
should be performed in accordance with all
agency requirements and applicable national,
state, and local codes to prevent damage to the
meter and ensure personnel safety.
•
Static electricity can damage sensitive
components.
•
Observe safe handling precautions for
static-sensitive components.
•
If the meter is installed in a high voltage
environment and a fault or installation error
occurs, high voltage may be present on any lead
or terminal.
Figure 3. Connector Board
Wiring Diagrams
Signal connections are made to a three-terminal con-
nector mounted on the rear of the display module.
The 4-20 mA input with no backlight has a maximum
voltage drop of 1 V and is wired as shown in
Figure 4
.
The loop-powered backlight configuration requires a
total maximum voltage drop of 4 V. The backlight op-
tion is recommended for dim lighting conditions and is
enabled when wired as shown in Figure 5 .
Figure 4. Connections without Backlight
Figure 5. Connections with Loop-Powered Backlight