Precision Digital PD6820 - Manual (Page 15)

PD6820 Loop-Powered Process Meter Instruction Manual
15
4-20 mA
Transmitter
Power
Supply
SAFE-TOUCH
BUTTONS
BACKLIGHT
POWER
UNLOCK LOCK LOOP 9-36 VDC
+ - + -
SIGNAL BACKLIGHT
Power
Supply
Slide Switch to
9-36 VDC
+ - + -
OUTPUT RESET
Figure 4. Input 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.
External Reset Connection
External reset connections are made to two terminals labeled RESET. Connect to a
contact closure source such as a relay or a pushbutton as shown in Figure 5.
SAFE-TOUCH
BUTTONS
BACKLIGHT
POWER
UNLOCK LOCK LOOP 9-36 VDC
+ - + -
SIGNAL BACKLIGHT
+ - + -
OUTPUT RESET
Figure 5. Reset Connections