Rice Lake 420 Plus Digital Weight Indicator - 7.5V DC-to-DC Power Supply Installation - Manual

December 2011 102527
7.5V DC-to-DC Power Supply Installation
Instructions
PN 97475
The 7.5 volt DC-to-DC power supply, PN 97475, uses a DC power source of 9–36VDC to provide +7.5VDC
power to the 420 Plus CPU board. This is a 25 Watt power supply, suitable to power the indicator and (16) 350
ohm load cells. Use with Analog Output option is acceptable.
CN1
CN2
1
2
3
4
3
2
1 +7.5V
+7.5V
GND
GND
+7.5VDC OUTPUT
DC INPUT
+V
-V
Figure 1. 7.5V DC-to-DC Power Supply Board
Use the following procedure to replace and install the DC to DC power supply in the 420 Plus indicator.
Installation Notes
• AC-powered indicators retrofit with a DC power supply must also replace the indicator serial tag. Consult
factory for more information.
• The power supply bracket is the same for the DC power supply and the AC power supply.
• DC power wiring to the indicator should be 18 AWG to 14 AWG for all conductors.
• For mobile applications, earth ground should be terminated to the vehicle chassis.
Warning
.
Disconnect power before removing indicator backplate
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