BATTERY SYSTEM MONITORS EM-70 AND EM-71

BATTERY SYSTEM MONITORS EM-70 AND EM-71
Electrical System Monitors
Know what your vehicle’s electrical system is doing with
the Vanner electrical system monitor.
System Monitors Designed for Use In:
w Transit Buses
w Tour Buses
w EMS Vehicles
w Boats
w Utility Vehicles
w RVs and Motor Homes
Overview
Vanner electrical system monitors sense several critical functions of a dual-voltage (24/12 Vdc)
vehicle or boat electrical system. These electrical monitors are typically used with Vanner battery
equalizer products.
System Monitor Features:
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Continually monitors vehicle’s electrical system
Designed for dual 12 volt batteries operating at 24 Vdc
Detects battery high/low voltage and battery balance conditions
Takes the guesswork out of battery operation
Operates status/warning lamps, control relays or alarms
Model EM70D Electrical
System
Monitor
QUICK CONNECTS
+ 24V IGN. SW.
+ 24V IGN. SW.
GND
GROUND
System Monitors
MONITOR
INPUT
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+ 12V
+ 12 VDC
The model EM-70D
Model EM70D
+ 24 VDC
+ 24V
is wired to the
ELECTRICAL SYSTEM
system’s ground, 12
MONITOR
BATT LOW
BATT. LOW
volt DC, 24 volt DC
BATT. HIGH
BATT HIGH
and +24 volt
BATT. BALANCE
BATT BALANCE
ignition. By
POWER ON LED
POWER ON
monitoring the two
DC voltages, it can
detect fault
conditions,
including battery voltage high (over 30.0 volts), battery voltage low (under 24.0 volts), and battery
balance. A battery balance fault condition can occur when the 12 Vdc input is outside the range of
(24Vdc input ÷2) +/- 6%.
LAMP
OUTPUT
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System monitoring takes place only when the ignition is switched on. The EM-70D has a 5-second
delay before the output terminal indicates an error condition. This feature prevents false indications
(blinking) from occurring when a “step load” change in system loads causes a transient on the DC
system. When a fault condition is detected, the EM-70D provides fault output signals that are
switched to ground. These outputs can operate external warning lamps, alarm buzzers or control
relays, and are rated for 375 milliamps (0.375 amps) DC. These outputs are short circuit protected
and are designed so they may be paralleled if less than three external lights are desired. It is also
possible to install momentary light test switches (or just one light test switch if three isolating diodes
are installed) which enable the operator to check the lamps to determine if they are functioning.
Experience the Power.
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Electrical System Monitors
Model EM-71 Electrical System Monitor
The model EM-71 electrical system monitor senses the +12 volt DC battery voltage in a vehicle or boat electrical system.
The EM-71 is wired to the system’s ground, +12 volt DC battery and +12 volt DC ignition switch. The unit monitors the
+12Vdc battery voltage and detects fault conditions of battery high voltage (over 15.0 volts*) and battery low voltage
(under 9.0 volts*). When a fault condition is detected, the EM-71 provides fault output signals that are switched to
ground. These outputs can operate external warning lamps, alarm
buzzers or control relays, and are rated for 75 milliamps (0.375 amps)
DC.
QUICK CONNECTS
These outputs are short-circuit protected and designed so they may be
paralleled if only a single external lamp (or other device) is desired. It is
also possible to install momentary light test switches (or just one if two
isolating diodes are installed) which enable the operator to check the
lamps to determine if they are functioning.
+24V
+
BATTERY
_
12V LOAD
GND
BATT HIGH
+ 12V IGN. SW.
GND
GROUND
+ 12V
+ 12V
ELECTRICAL SYSTEM
MONITOR
BATT LOW
BATT. LOW
BATT HIGH
BATT. HIGH
+
OPTIONAL
LOAD DISCONNECT
SWITCHES
BATT B
_
+
System Monitors
Model EM71
+24V
VANNER
VOLTMASTER
EQUALIZER
OPTIONAL
LOAD DISCONNECT
SWITCHES
+ 12V IGN. SW.
24V LOAD
+24V
+12V
12V ALT
_
BATT LOW
GND
+12V
+
EM-71
BATT A
EM-70D
_
+12 IGN
+
24V ALT
_
BATT BALANCE
BATT HIGH
BATT LOW
12V LOAD
GND
+24 IGN
+ VOLTAGE
FOR LAMPS
+ VOLTAGE
FOR LAMPS
1 AMP FUSE
1 AMP FUSE
Electrical System Monitor Specifications
Model Number:
Description:
Fault Conditions:
Battery high voltage:
Batter low voltage:
Battery balance:
Dimensions HxWxD:
Weight:
EM-70D
Monitors voltages in a 24/12Vdc system
Provides outputs for batt. high, batt. low
and battery balance fault conditions.
EM-71
Monitors the voltage of a 12 Vdc system
and provides outputs for batt. high, and
batt. low fault conditions.
+24Vdc input over 30Vdc
+24Vdc input under 24Vdc
+12Vdc input over (+24Vdc input/2) +6%
Or +12Vdc input over (+24Vdc input/2) -6%
.75” x 4.5” x 6.625”
.84 lbs.
+12Vdc input over 15 Vdc
+12Vdc input under 9Vdc
The high and low voltage trip levels may
be individually adjusted
.75” x 4.5” x 6.625”
.84 lbs.
Vanner’s policy is one of continuous improvement. We reserve the right to change specifications without notice.
Corporate Office:
4282 Reynolds Drive
Hilliard, Ohio 43026
Tel: 614-771-2718
Fax: 614-771-4904
800-AC POWER
©Copyright 2001, Vanner, Inc.
Printed July 2001
www.vanner.com
e-mail: pwrsales@vanner.com
“Vanner” and “Vanner/Sine-wave Design” are trademarks of Vanner, Inc.
Utility Truck photo courtesy of Fleet Electric. Bus photo courtesy of Neoplan USA.
Ambulance photo courtesy of Horton Emergency Vehicles.
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