File: 091-75-at rev a
Rev: A, Date 3-19-07, MFG
INSTRUCTION MANUAL
LOAD MANAGER MARK IV-AT
A 9 CHANNEL SEQUENCER AND LOAD
SHEDDING CONTROLLER WITH HIGH
IDLE CONTROL
MODEL #091-75-AT
3 YEAR WARRANTY
KUSSMAUL ELECTRONICS CO., INC.
170 CHERRY AVE., WEST SAYVILLE, N.Y. 11796-1221
TEL: in NY 631-567-0314 TOLL FREE: 800-346-0857 FAX: 631-567-5826
INTRODUCTION
The Load Manager Mark IV-AT is a 9-channel sequencer and load shedding controller which controls
9 external relays that are supplied by the installer. Provision has been made to permit the installer to
sequence only a total of 5, 6, 7, 8 or 9 channels. Those channels for which sequencing is not selected
will be energized constantly and controlled only by there own external, manually controlled switches or
by the load management circuits.
Load management for the 9 channels is completely independent of the sequencing function. Nine "dip
switches" are provided, one for each channel to establish the load shedding priority. These switches
permit an absolutely arbitrary selection of the shedding sequence and in addition permit any of the
channels to be "locked out" and not be load shed under any circumstances.
In addition to the sequencing/load management functions, this device provides a High Idle control to
increase engine speed and thus the alternator output. The High Idle output operates an external relay
or other device provided by the installer. The High Idle signal is the first output obtained when the Load
Manager Mark IV-AT senses low voltage. It remains until the voltage rises to the point at which no loads
are shed and in addition continues to maintain the higher engine speed for 5 minutes. This guarantees
that engine speed cycling is minimized.
NOTE
The Load Manager Mark IV-AT is designed to operate relays. It is not
necessary to connect to all the outputs. Any outputs, at the discretion of
the installer, may remain unused. Nothing should be connected to the
unused outputs. Relays must have a coil resistance of 40 Ohms or
greater.
DO NOT LOAD ANY OUTPUT WITH A RELAY WITH A
RESISTANCE LESS THAN 40 OHMS
LOAD MANAGER PROGRAMMING
Recognizing that priorities may change after an installation is made, the LOAD MANAGER MARK IV-
AT is designed so that the priority of load shedding may be easily altered.
CAUTION
Sequencing of the loads occurs at approximately 1/2-second intervals starting with the relay
connected to terminal 1 and progressing to the relay connected to terminal 9.
There are 5 switches, each with 5 levers.
Only one lever on each switch may be
in the “ON” position.
Note that sequencing of the loads is not programmable, but is controlled by the wiring connections to
the LOAD MANAGER MARK IV-AT.
Nine sets of "dip switches" are provided for setting the priority of load shedding. Each set of "dip
switches" controls one output and contains 9 individual switches. Setting any of one of the individual
switches to the "ON" position determines the load-shed priority of that output. That is, placing the #1
switch in the "ON" position determines that this output will be the first load to be shed. Placing #2 switch
in the "ON" position will shed this output next. Note that any of the 9 sets of "dip switches" can be set
to shed first and any other to be shed next. This results in a completely random load shedding priority.
NOTE
If the Installer determines that some loads should not be shed under
any circumstances, then the dip switch controlling that load should
be all set in the "OFF" position.
SEQUENCE CONTROL
The installer wiring the relays to the Load Manager Mark IV-AT controls load sequencing. In order to
limit the sequencing to fewer than 9 channels, a 4 element "dip switch" has been provided. This switch
locks out the sequencing function for channels 6, 7, 8, and 9. Placing the #1 switch in the "ON" position
enables channel 6 instantly, not in sequence. Placing the #2 switch in the "ON" position enables
channel 7, and so forth. This sequencing lockout control has no effect on the load shedding operation.
Any or all of the channels that are removed from the sequencer are still controlled by their load shedding
program switches.
INPUT SIGNAL POLARITY SELECTION
The Load Manager Mark IV-AT has been designed to accept command inputs of either +12 volts or
ground for the Load Manager Enable (pin 15) and the Start Sequencer (pin 12). Switch S10 on
the circuit board controls the polarity of both inputs. Placing this switch in the Source position permits
the Load Manager to respond to +12 volt inputs as illustrated in figure 1. With S10 in the Ground
position it is necessary to ground pins 12 and 15 for sequencing and load managing. The schematic
for ground inputs is illustrated in figure 3.
HIGH IDLE LOCKOUT
Since the High Idle output occurs first, before shedding any loads, the vehicle's engine will be speeded
up before any loads are shed. At some time, such as when a pump drive is to be engaged, it is
mandatory that the engine be at idle speed. (Pin 17) provides a means of disabling the high idle.
Switching (Pin 17) to ground will ensure that the High Idle is locked out. This has no effect on the
sequencing or load management functions of the Load Manager Mark IV-AT.
REV.
B
2
/
1
9
/
9
9
REDUCE
1
2
3
4
5
6
7
8
9
YELLOW
10
11
12
13
14
15
16
GROUND
THIS LINE PO WER S TH E LOAD MAN AGER
CLOSE TO ENABLE
LOAD MANAGER
17
18
GROUND
G
R
O
U
N
D
SWITCH POSITION
RELAY REMOVED
FROM SEQUENCING
1 ON 6
2 ON 7
3 ON 8
4 ON 9
SEQUENCER LOCKOUT PROGRAM SWITCH
This set of switches controls
the priority for Relay #9
INPUT SIGNAL POLARITY
SELECTOR SWITCH
This set of switches controls
the priority for Relay #2
This set of switches controls
the priority for Relay #1
TURN SWITCH #9 "ON" TO SHED THIS LOAD LAST
TURN SWITCH #1 "ON" TO SHED THIS LOAD FIRST
Figure #2 - Programming Switch Locations
R
E
V
.
C
1
/
9
/
0
2
R
E
V
.
B
2
/
1
8
/
9
9
REDUCE
1
2
3
4
5
6
7
8
9
YELLOW
10
11
12
13
14
15
16
GROUND
THIS LINE PO WER S TH E LOAD MAN AGER
CLOSE TO ENABLE
LOAD MANAGER
17
18
GROUND
G
R
O
U
N
D
GROUND
GROUND
INSTALLATION RECORD & WARRANTY
Date Installed
Installed By
Vehicle Identification
Vehicle Owner
WARRANTY
All products of Kussmaul Electronics Company Inc. are warranted to be
free of defects of material or workmanship. Liability is limited to repairing or
replacing at our factory, without charge, any material or defects which become
apparent in normal use within 3 years from the date the equipment was shipped.
Equipment is to be returned, shipping charges prepaid and will be returned,
after repair, shipping charges paid.
Kussmaul Electronics Company, Inc. shall have no liability for damages of
any kind to associated equipment arising from the installation and /or use of the
Kussmaul Electronics Company, Inc. products. The purchaser, by the acceptance of the equipment, assumes all liability for any damages which may result
from its installation, use or misuse, by the purchaser, his or its employees or
others.
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