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What is the purpose of the VANNER EM70D Electronic Monitor?
The VANNER EM70D Electronic Monitor is a device designed to monitor several critical functions in the electrical system of a vehicle that operates on a 24-volt system. It will also monitor the 12-volt service when using a Vanner VoltMaster Battery Equalizer which supplies 12-volt service from a 24-volt source.
What different functions can the VANNER EM70D perform?
The VANNER EM70D can function in a variety of ways:
1. The monitor functions as an alternator monitor when the Battery Balance lamp output and +12 volt monitor input terminals are not in use.
2. The monitor functions as a device to control a field current relay, shutting down the field current if the voltage regulator fails in the full field mode. This function is accomplished by connecting the VANNER EM70D as normal and installing a latching field current relay to the Battery High lamp output terminal.
How do the lamp outputs work on the VANNER EM70D?
In all cases, the lamp outputs in the VANNER EM70D are designed to provide the ground connection for lamps (or buzzers, beepers, relays) under a fault condition. The lamp outputs have also been designed so they may be paralleled should the installer wish to have fewer than three indicator lamps in service. If this is done, the output current remains at 0.375 amps (375 milliamps).
Where should the VANNER EM70D be installed?
When installing the VANNER EM70D, locate a dry, flat surface that will accommodate the four mounting holes. Even though the unit is potted and completely sealed, it is preferable to locate the monitor in as clean a location as possible.
What wire gauge should be used for the VANNER EM70D?
Since the current levels are in the milliamp range, it is permissible to use 18 gauge wire at all seven spade terminals.
Where should the monitor input leads be connected for the VANNER EM70D?
When connecting the three monitor input leads to the system, it is important to note that the connections should be made to the wiring system as close to the battery terminals as possible. This will allow the VANNER EM70D to monitor the condition of the wiring and terminals in the system and alert the operator if a problem develops. Should these three wires be connected to the three terminals on the equalizer, the VANNER EM70D will only monitor the equalizer voltages and will not respond to wiring or termination problems.
What are the technical specifications for the VANNER EM70D?
| IGNITION SYSTEM INPUT | 24VDC (Minimum 18VDC, Maximum 35VDC) |
| WARNING LAMP TRIP LEVELS |
Battery System High – greater than 30VDC Battery System Low – less than 24VDC Battery Balance – greater than (INPUT / 2) + 6% OR less than (INPUT / 2) – 6% |
| WARNING LAMP OUTPUT | Open collector style, 0.375 amps (375 milliamps) maximum (Applies to lamps, buzzers, beepers, relays, etc.) |
How can I test if the lamps are functioning on the VANNER EM70D?
It is possible to install momentary light test switches (or just one light test switch provided three isolating diodes are installed) so as to enable the operator to check the lamps to determine if they are functioning.
What triggers the “Battery Low” warning on the VANNER EM70D and what should be checked?
The Battery Low lamp glows when the battery voltage drops below 24VDC. The following items should be checked:
– Check alternator output
– Check alternator regulator
– Check battery connections
– Check battery cells
– Check Battery Equalizer connections
What triggers the “Battery High” warning on the VANNER EM70D and what should be checked?
The Battery High lamp glows when the battery voltage exceeds 30VDC. The following items should be checked:
– Check alternator output
– Check alternator regulator
– Check battery connections
What triggers the “Battery Balance” warning on the VANNER EM70D?
The Battery Balance lamp will glow under the following conditions:
1. Batteries out of balance (greater than 1.5 volt difference between the two batteries).
2. Demand for 12v power exceeds Battery Equalizer rated output causing batteries to go out of balance.
3. Equalizer is not functioning properly.
What steps should be taken if the VANNER EM70D indicates the batteries are out of balance?
If there is a greater than 1.5-volt difference between the two batteries, perform the following checks:
– Check fuses in Battery Equalizer cables
– Check Battery Equalizer connections
– Check battery connections
– Check Equalizer cables for proper gauge
What should be done if the demand for 12v power exceeds the Battery Equalizer rated output causing an imbalance on the VANNER EM70D?
If the demand causes the batteries to go out of balance, you should:
– Reduce 12v loads
– Install a larger or additional Battery Equalizer
How do I troubleshoot if the Equalizer is not functioning properly when indicated by the VANNER EM70D?
If the Equalizer is suspected of not functioning properly:
– Perform an on-vehicle test from the troubleshooting guide in the Equalizer Owner’s Manual.
– If inoperable, replace the Battery Equalizer.
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