A94319-B
Vanner, Inc.
GENERAL
SPECIFICATIONS
ELECTRONIC MONITOR EM-70D
Owner's Manual
The EM-70D 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.
CHARACTERISTICS
The EM-70D 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 EM-70D as normal and installing a latching field
current relay to the Battery High lamp output terminal.
In all cases the lamp outputs in the EM-70D 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 (3)
indicator lamps in service. If this is done, the output current remains at 0.375 amps (375 milliamps). It is possible to install momentary light
test switches (or just one (1) light test switch provided three (3) isolating diodes are installed) so as to enable the operator to check the
lamps to determine if they are functioning.
INSTALLATION
When installing the EM-70D, 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. Since the current levels are in the milliamp range,
it is permissible to use 18 gauge wire at all seven spade terminals. When connecting the three (3) 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
EM-70D to monitor the condition of the wiring and terminals in the system and alert the operator if a problem develops. Should these three
(3) wires be connected to the three terminals on the equalizer, the EM-70D will only monitor the equalizer voltages and will not respond to
wiring or termination problems.
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 + 6% OR less than INPUT - 6%
WARNING LAMP* OUTPUT:
Open collector style, 0.375 amps (375 milliamps) maximum
*Also applies to buzzers, beepers, relays, etc.
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