PRECISION DIGITAL vantageview Safe Touch PD6700, Instruction Manual

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PD6700 Field-Mount Loop-Powered Process Meter
Instruction Manual
8
Wiring Diagrams
Signal connections are made to a four-terminal
connector mounted in the base of the enclosure per
Figure 3. Connector Board . The enclosure also
provides one internal and one external earth
grounding screw.
For installations that don’t use the backlight, the
maximum voltage drop is 3 V and connections are
made per
Figure 4 .
For installations that use the backlight powered from
the meter, the maximum voltage drop is 6 V and
connections are made per
Figure 5 .
For installations that use the backlight powered from
an external source, the maximum voltage drop is 3 V
and connections are made per
Figure 6 .
Figure 4. Connections without Backlight
Figure 5. Connections with Loop-Powered Backlight
Loop-powered backlight brightness will increase as
the input signal current increases. If constant
backlight brightness is desired, the backlight should
be powered by an external source.
Figure 6. Connections with Externally-Powered
Backlight
It is possible to use the same transmitter (signal loop)
power supply for the externally powered backlight.
The backlight circuit will draw 25 mA in addition to the
loop circuit.
4-20 mA
Transmitter
UNLO CK LOCK
+ - + -
SIG NA L BACKLIG H T
Power
Supply
SAFE-TO UCH
BUTTO NS
LOOP 9-36
VDC
BACKLIG HT
PO W ER
4-20 mA
Transmitter
+ - + -
SIG N AL BAC KL IG HT
Slide Switch to
LOOP
UNLO CK LOCK
SAF E-TO UCH
BUTTO NS
LOOP 9-36
VDC
BACKLIG HT
PO W ER
Power
Supply
4-20 mA
Transmitter
+ - + -
SIG N AL BAC KL IG HT
Slide Switch to
9-36 VDC
Power Supply
UNLO CK LOCK
SAF E-TO UCH
BUTTO NS
LOOP 9-36
VDC
BACKLIG HT
PO W ER
Power
Supply