Veris Technologies MSP EC and pH (1997-2008 floppy disk drive 1.02E) - Operating Instructions - Manual (Page 55)

Veris Technologies
Pub. #OM MSP03-1
55
Figure 3. External Controller circuit board (metal cover removed)
3. Test voltage coming out of External Controller to solenoids. Disconnect the weather-pack
connectors in line from Controller to the solenoids. Using a digital voltmeter set to read voltage,
insert leads into connector coming from Controller. Activate manual raise-lower switch and read
voltage. (Figure 4) Voltage should be 12 volts.
Figure 4. Testing voltage on power leads to solenoid.
4. Test continuity of coil. With voltmeter set to ohms (resistance), insert both leads into the
weatherpack connector leading to each solenoid. Start at the jumper wire (at first connection
from external controller) and move to connector at solenoid. This tests the continuity of the signal
through the coil. You should have continuity if the coil is working. Test both solenoids.
SOLENOID LED’s
12V C 5V
UP
DOWN