Class1 ESM3 User Manual
ESM_III
Standard Features .................................................................2
Display Panel .........................................................................3
System Configuration ............................................................4
Main Battery Only Configuration............................................5
Main and Isolated Battery Configuration................................6
Electrical System Manager II.................................................7
Specifications .................................................................... 8-9
Models and Functions .........................................................10
Sample Circuits ..............................................................11-12
Troubleshooting ...................................................................13
Notes ...................................................................................14
1
Standard Features
Sequence
All outputs sequence on (T1-T7) and off (T7-T1).
Automatic Load Reset
Any load which has been shed will remain off for a minimum of two minutes.
The loads will be controlled back on (unshed) by the system when the system voltage rises above the unshed level.
Shed loads can be turned on immediately by turning off the load management enable input.
Over-Voltage Indicator
The system manager continually monitors the system voltage and will activate output T15 ( SW1 switch 3 ON) when it detects that the system voltage
has increased above 15.0 volts. The system will not react to the spurious
voltage transients which may exist in the electrical system as loads and devices are cycled.
Fast Idle Control
The system manager is capable of becoming a part of a system which controls a fast idle device. The fast idle output T15 (SW1 switch 3 OFF) will
activate whenever the system voltage falls to 12.8 volts or below.
The output will deactivate if the system manager is reset, load management
disabled or when the system voltage recovers above 12.8 volts.
This output should be utilized with appropriate safety interlocks.
Battery Warning
The Battery Warning feature is a special output (T 8) which indicates that the
electrical system voltage has fallen below 11.9 VDC.
The Class 1 system manager continuously monitors the electrical system.
This output can be wired to a warning device that requires less than 250 mA
or to a relay if higher current devices are used.
Isolated Battery Warning
This is an optional configuration used when an isolated (auxiliary) battery
needs to be monitored. J9 must be in the ISO BATTERY position and SW1
switch 1 must be turned ON. T7 becomes the Isolated Battery Warning output
and activates when the isolated battery voltage falls below 11.9 VDC.
This output can be wired to a warning device that requires less than 250 mA
or to a relay if higher current devices are used.
105519 08172000
2
Display Panel
STANDARD PANEL DISPLAY
The Class1 Electrical System Manager is supplied with an indicator panel.
The indicator panel is designed to fit in a standard rocker switch cutout ( 7/8” x 1-1/2”).
The indicator panel consists of four LED’s:
POWER ON (GREEN WIRE) T13
This LED illuminates when power is applied to the System Manager.
BATTERY WARNING (YELLOW WIRE) T8
This LED activates when the system voltage drops below 11.9 VDC.
ISOLATED BATTERY LOW (BLUE WIRE) OPTION T7
This LED illuminates when an auxiliary battery voltage drops below 11.9
VDC.
OVER-VOLTAGE OR FAST IDLE (BROWN WIRE) T15
This LED illuminates when system voltage drops below 12.8 VDC or rises
above 15.0 VDC as configured by SW1 switch 3.
GROUND (BLACK WIRE)
Connected to system ground.
3
System Configuration
The Electrical System Manager is configured by the use of a 4 position DIP Switch SW1
and 9 shunts (jumpers) J1 - J9.
SW1
switch OFF ON
1 Main Battery Main and Isolated Batteries
2 Shed T1-T7 Shed T7-T1
3 Fast Idle Overvoltage
4 Shed all Don’t shed T1 or T2
J1 controls polarity of the Master Switch input.
J2-J8 control the polarity of output T1 through T7
J9 controls whether T12 is tied to the Master Switch input T10 or independent for an
Isolated Battery Input.
<=-CAUTION-=>
When J9 is in the MASTER SWITCH position T12 is tied directly to T10. A direct short
circuit will occur if an Isolated Battery Input is at T12 and a ground Master Switch input
is at T10.
<=-CAUTION-=>
T5T4T3T2T1
T6
FT13
L2
FB2
J2
GND POS
R11
U2
J3 J4 J5 J6 J7 J8
Out-1 Out-2 Out-3 Out-4 Out-5 Out-6 Out-7
GND POS
U1
C2 C1
C13 C12
C7
XT1
GND POS GND POS
U19U17
R7 R6R5
SW2
GND POS
U3
REV B
GMC / AMS
04-27-2000
P.N. 104702
GND POS GND POS
R8
C11C10 C9C8
C3
RSP2
U22U21U20U18U16
D7 D6D5 D4
RSP1
U13U12U11U10U9U8U7
1
2
3
4
SHED O/I
TP1 TP2
TP3 TP4
BATTS
SHED
T15
R14
U4
R13
1
SW1
J9
U15U14
R21
R16
R18
R12
U24
C16
R17
ON OFF
MAIN/ISO
7 1
OVER VOLTS
NO
234
TB 12
INPUT
MASTER
SWITCH
ISO
BATTERY
R10
R9
PHONE 352-629-5020
FAX 352-629-2902
http://www.class1.com
C15
+
R15
FT15
U23
R3 R2
C17
MAIN
1 7
FAST IDLE
YES
J1
ON
OFF
D3
C4
OCALA ,FL
FB1
L1
U5
R4
C18
GROUND
POSITIVE
Master
Switch
T15T14T13T12T11T10T9T8T7
FT14FT12FT11FT10FT8FT7FT6FT5FT4FT3FT2FT1
D2
F1
Z1
D1
C5
R19
R20
C14
105519 08172000
4
Main Battery Only Configuration
SW1 switch 1 OFF.
All seven load control outputs can be sequenced and shed. These outputs
are at terminals #1 through #7 (T1 - T7). One method of wiring is shown
below.
T 15
T 14
Fast Idle
OverVoltage
T 13
T 12
T 11
Load Manage
Ignition Switch
+
-
Main Batt
T 10
T 9
Enable Switch
Battery Warning
Master Switch
Relay 7
T 8
T 7
Load SW 7
T 6
T 5
T 4
T 3
T 2
T 1
Dash
Load SW 1
Load
Relay 1
Switches
Relays
5
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