Owner`s manual

VANNER Incorporated Testing and Troubleshooting

70-Series Power Management System OWNER’S MANUAL

Testing and Troubleshooting

CAUTION

Servicing of electrical systems should only be performed by trained and qualified technical personnel.

Equipment Required

VoltMeter having 0.01 volt resolution. (Fluke Model 87 Multimeter recommended).

Clamp-on amp meter (Fluke Model 36 Clamp-on Meter recommended).

Vanner Repair Service

Vanner offers a quick turn around factory repair service. Send the unit to the address

below with a note instructing us to repair it. Include your name, phone number, shipping

address (not a P.O. Box Number), and your purchase order number.

Test Procedure for VANN-Guard 70-Series Power

Management Systems

The VANN-Guard is working properly if:

1. The 12 volt DC loads are being operated continuously and are within the rated capacity of the

VANN-Guard and;

2. Battery A voltage is lower than Battery B by no more than 0.05 to 0.10 volts (measured at the

VANN-Guard’s +24, +12 and GND terminals).

Vanner VANN-Guards are electronically protected against reverse polarity damage therefore the DC

connection sequence is not an issue.

Vanner VANN-Guards will not function properly unless all three battery connections are made. Battery A

and Battery B voltages both must be above 8 volts for the unit to turn ON.

Vanner VANN-Guards may be used in parallel with other VANN-Guards and Vanner Equalizer models.

Please note that the 24V, 12V and GND stud position and orientation are different on VANN-Guard 70-

Series than on other Vanner Equalizers.

VANN-Guard Test Procedure:

1. Field-test the equalizer while fully connected to the vehicle batteries. For bench testing, two 12 volt

batteries, or two 12 volt power supplies are required. The VANN-Guard must be connected to the

batteries at GND, 12V and 24V to function properly.

2. If battery voltage is below 24 volts start the vehicle or apply a 24 volt battery charger to the batteries.

3. Turn ON 12 volt DC loads up to the VANN-Guard’s rated capacity. Measure DC amps on the VANN-

Guard +12 cable to verify load amperages.

4. At the VANN-Guard measure and record:

a. Battery A voltage (voltage between the VANN-Guard’s +12 and GND terminals)

b. Battery B voltage (voltage between the VANN-Guard’s +24 and +12 terminals)

5. Subtract Battery A voltage from Battery B voltage and compare readings.