Veris Technologies MSP EC and pH (1997-2008 floppy disk drive 1.02E) - Operating Instructions - Manual (Page 51)

Veris Technologies
Pub. #OM MSP03-1
51
Procedure #1: Checking power inside External Controller
The Veris pH module requires a minimum of 12 volts at all times. 12 volts at the battery terminals is
NOT sufficient power for the system to function, due to the significant current draw when the pumps
and solenoids are engaged. Reduced voltage can be caused by corroded or dirty terminals, and an
inadequately charged battery or failure in the charging system. Because there is often a voltage drop
found in tractor power ports, you should hook the pH module power cables directly to the battery. If
the Veris electrical system is not functioning properly, the Troubleshooting flowcharts will direct you
through the most logical steps to identify the cause of the problem.
If the problem persists, you will likely need to check the power inside the External Controller in order
to isolate power system problems. An overview of this procedure is shown in Figure1.
Figure 1. Flowchart for checking power in External Controller.
1. Inspect LED’s on External Controller circuit board.
Remove metal plate covering external controller and inspect the fuse LED lights, as shown in Figure
2. If the green LED for its fuse is lit, the fuse is working.