Mastervac MLI Ultra Operating manual

MLI Ultra
LITHIUM-ION BATTERY
12/1250, 24/1250
USER AND INSTALLATION MANUAL
10000018055 /01
For the latest version of this manual, visit our website:
Ga om deze handleiding in andere talen te downloaden naar onze website:
Um diese Anleitung in anderen Sprachen herunterzuladen, besuchen Sie bitte unsere Website:
Pour télécharger ce manuel dans d'autres langues, consultez notre site Web :
Para descargar este manual en otros idiomas, visite nuestro sitio web:
Per scaricare questo manuale in altre lingue, visitare la pagina del prodotto sul nostro sito Web:
www.mastervolt.com
EN
NL
DE
FR
ES
IT

2
MLI Ultra 12/1250, 24/1250 –User and Installation Manual
Table of contents
1. SAFETY INSTRUCTIONS .................... 3
Safety warnings..................................... 3
Safety guidelines................................... 4
2. GENERAL INFORMATION................... 5
Liability.................................................. 5
Warranty ............................................... 5
Disclaimer............................................. 5
Identification label ................................. 5
Correct disposal of this product............. 5
3. PRODUCT DESCRIPTION................... 6
Battery Management System (BMS)..... 6
Status LEDs.......................................... 7
Battery switch-button (safety
disconnect)........................................... 7
Heat pad ............................................... 8
Charging ............................................... 8
4. BASIC INSTALLATION......................... 9
Unpacking............................................. 9
Location ................................................ 9
Materials needed................................. 10
Installation procedure for a single unit. 10
Adding the MLI Ultra to a
MasterBus network ............................ 11
Adding the MLI Ultra to a CZone
network .............................................. 12
Auxiliary connector.............................. 13
5. CONFIGURATION.............................. 13
DIP switch settings.............................. 13
MasterBus DIP switch settings...........14
CZone DIP switch settings..................14
How to change the DIP switch
settings..............................................14
Configuration in a MasterBus network .15
Monitoring tab.....................................15
Alarms tab..........................................15
History tab..........................................16
Configuration tab................................16
Events tab ..........................................17
Events sources...................................18
Event commands................................19
Stop Charge event..............................19
Capacity Very Low event....................20
How to activate MasterBus powering..20
Configuration in a CZone network........21
6. MULTIPLE BATTERIES ......................23
Series and parallel connections...........23
Clustering multiple batteries.................24
Using DIP switches (MasterBus only).24
Using MasterAdjust ............................25
Using CZone Configuration Tool.........26
7. STORAGE AND CARE........................27
8. TROUBLESHOOTING.........................28
9. SPECIFICATIONS...............................30
Technical specifications.......................30
Battery switch –automatic behavior ....31

MLI Ultra 12/1250, 24/1250 –User and Installation Manual
3
1. SAFETY INSTRUCTIONS
IMPORTANT SAFETY INSTRUCTIONS
SAVE THESE INSTRUCTIONS
Safety warnings
WARNING!
The battery contains hazardous materials that are stored safely
during normal use. Do not crush, open or drop the battery
housing. Do not touch or ingest any of the released materials or
inhale released gasses when accidental leakage of the battery
occurs. Should skin contact, eye contact or inhalation
nevertheless occur, take the necessary first aid measures
immediately. Refer to the Material Safety Data Sheet for
Mastervolt Lithium-Ion batteries, which is available on
www.mastervolt.com.
WARNING!
Avoid short circuiting batteries as this may result in fire,
explosion, electric shock or release of toxic gas. Use insulated
tools only and keep metal objects away from the battery. Do not
wear watches, bracelets, necklaces or other metal objects when
working on the battery. In case of fire, take the necessary
firefighting measures immediately. Refer to the Material Safety
Data Sheet for Mastervolt Lithium-Ion batteries, which is
available on www.mastervolt.com.
WARNING!
Short circuits, too deep discharges and too high charge currents
will damage the battery and may result in fire, explosion, electric
shock or release of toxic gas. Never charge a battery:
- after it was discharged below the Battery Safety voltage;
- when the battery is damaged;

4
MLI Ultra 12/1250, 24/1250 –User and Installation Manual
- when the battery was over-charged.
If in doubt, contact your Mastervolt distributor/dealer.
CAUTION!
When transported, make sure that:
- the battery is in its original package or equivalent;
- the battery is in upright position;
- soft slings are used to avoid damage;
- the battery is only lifted at the handles;
- the battery is handled with care.
Note: The voltage range (12.0-14.6V or 24.0-29.2V) is larger than you may expect from other
battery types such as lead-acid batteries. Be aware that these voltages could exceed
the permitted voltages of the connected load(s).
Warning regarding life support applications
Mastervolt products are not designed to be used as component of medical equipment, unless
negotiated in the form of a written agreement between customer and/or manufacturer and
Mastervolt. Such agreement will require the equipment manufacturer either to contract
additional reliability testing of the Mastervolt parts and/or to commit to undertake such testing
as a part of the manufacturing process. Furthermore, the manufacturer must agree to
indemnify and not hold Mastervolt responsible for any claims arising from the use of the
Mastervolt parts in the life support equipment.
Safety guidelines
- Use the MLI Ultra following the instructions and specifications stated in this manual.
- Work on the MLI Ultra should be carried out by qualified personnel only.
- Non-compliance with operating instructions, repairs made with other than original parts, or repairs
made without authorization render the warranty.
- If programming of events in a MasterBus or CZone network is required, the installer must be
familiar with the programming of such events.
- Connections and safety features must always comply with all local rules and regulations.
- Use cables with an appropriate size.
- Never use the MLI Ultra in situations where there is danger of gas or dust explosion or potentially
flammable products!
- Only use the MLI Ultra in a technical correct condition.
- Only use the MLI Ultra in a well-ventilated area and protect the connectors from moisture and
dust.
- Switch off all charging systems and disconnect the MLI Ultra from the electrical installation during
maintenance and/or repair activities.

MLI Ultra 12/1250, 24/1250 –User and Installation Manual
5
2. GENERAL INFORMATION
Liability
Mastervolt cannot be held liable for:
- Consequential damage resulting from the use of the MLI Ultra.
- Possible errors in the included manual and the consequences of these.
- Use that is inconsistent with the purpose of the MLI Ultra.
Warranty
The Mastervolt product warranty covers the MLI Ultra for the first two years after the purchase date,
on the condition that the product is installed and used according to the instructions in this manual.
Installation or use that does not comply with these instructions may result in under performance,
damage or failure of the product and may void this warranty. The warranty is limited to the cost of
repair and/or replacement of the product. Costs of labor or shipping are not covered by this
warranty.
Disclaimer
Our products are subject to continual development and improvement. Therefore, additions or
modifications to the products may cause changes to the technical data and functional specifications.
No rights can be derived from this document. Please consult our online Terms & Conditions of Sale.
Identification label
The following picture is only an example!
The identification label is located on the top side of the MLI Ultra.
Technical information required for service and maintenance (part
number, serial number and revision code) can be derived from
the identification label.
CAUTION!
Never remove the identification label.
This will void the warranty.
Correct disposal of this product
This product is designed and manufactured with high quality materials and
components, which can be recycled and reused. Act according to your local rules
and do not dispose of your old products with your normal household waste. The
correct disposal of your old product will help prevent potential negative
consequences to the environment and human health.

6
MLI Ultra 12/1250, 24/1250 –User and Installation Manual
3. PRODUCT DESCRIPTION
1. M8 positive terminal
2. M8 negative terminal
3. Provision for removable handle
4. Hold down edges group 31, fit battery group size 49
5. Attachment strap support
6. Protective vent; maintain adequate ventilation around
this opening. Do not touch the membrane!
7. Auxiliary connector
8. MasterBus/CZone connectors
9. Status LEDs and DIP switch
cover
10. Battery switch-button (safety
disconnect)
Figure 1: overview of the MLI Ultra 1250
Battery Management System (BMS)
The MLI Ultra has a built-in Battery Management System (BMS) and a built-in battery switch. The
BMS protects the battery by automatically controlling the battery switch when thresholds are met.
This is called a 'battery safety'-event. See chapter "SPECIFICATIONS”for the thresholds. An
automatically switch-off is initiated after the following events:
•Cell over- or under-voltage
•Battery over-current
•Over-temperature of the MLI Ultra
•Low State of Charge (SOC)
Likewise, automatically switch-on is initiated when the conditions are safe again.
The BMS can also:
- activate the heat pad
- communicate with Mastervolt charge devices over MasterBus or CZone
- send out warnings and alarms (to a display like the SmartRemote or EasyView 5 e.g.)
For more information on system automation, see section "Events tab" on page 17.
10
9
7
2
6
5
3
8
4
1

MLI Ultra 12/1250, 24/1250 –User and Installation Manual
7
Status LEDs
Figure 2: status LEDs
Note: to minimize self-discharge, LEDs B and C are off during normal operation.
LED
Color
Name
Behavior
A
Red
Error
If this LED is on, a BMS error has occurred or cells are damaged.
Check the installation and contact your Mastervolt distributor/dealer.
B
Yellow
Battery
state
During normal operation the LED is off.
1 short blink
●●●
SoC low. Charge the battery.
2 short blinks
●● ●● ●●
CZone network identification (during
installation).
3 short blinks
●●● ●●●
Auto cluster configuration error. See section
"Using DIP switches" on page 24.
4 short blinks
●●●● ●●●●
Battery is executing a recovering procedure.
Blinking slowly
▬▬▬
Battery is updating its firmware.
C
Green
Battery
switch
state
When the Battery switch-button is pressed short, this LED indicates
the status of the battery switch.
- Solid on for 1 minute: battery is on (switch is closed).
- Blinking for 1 minute: battery is off (switch is open).
Battery switch-button (safety disconnect)
CAUTION!
This built-in battery switch is to safely disconnect the battery. It also disconnects
from the charger! If the battery was switched-OFF manually, it must be switched-
ON manually.
Figure 3: Battery switch-button
Press short for status; Short press to make LED C show the
status of the Battery switch.
•Solid on for 1 minute: battery is on (switch is closed).
•Blinking for 1 minute: battery is off (switch is open).
Press 1 sec; Long press for 1 second to switch-off. LED C
will blink.
Press 5 sec; Long press for 5 seconds to switch-on. LED C
will light up for 1 minute.

8
MLI Ultra 12/1250, 24/1250 –User and Installation Manual
Heat pad
The heat pad is controlled automatically. It can also be controlled through MasterBus events or
CZone circuits.
Charging
In a Mastervolt/CZone network, the charging is done automatically. The MLI Ultra can be charged
with any Mastervolt battery charger, like the ChargeMaster Plus series, or with a ProMariner
ProSport HD or ProNautic for example. Make sure that the charger is Lithium Ion compatible and
meets the MLI Ultra's charge parameters. Set the battery type to MLI or adjust the 3-step+ (also
known as IuoUo) charge characteristic as follows:
Model
Bulk / absorption voltage
Float voltage
12V
14.25 V
13.5 V
24V
28.5 V
27 V
LED B will blink yellow when the state of charge (SOC) is low. Make sure to charge when the SOC
is low to preserve the lifespan.
The MLI Ultra supports 12 V, 24V, 36V and 48V systems. Mastervolt recommends one charger for
batteries that are connected in series.
Do not use a sensor for temperature compensated charging. Temperatures of the battery and its
cells are monitored by the built-in BMS.

MLI Ultra 12/1250, 24/1250 –User and Installation Manual
9
4. BASIC INSTALLATION
Unpacking
The delivery consists of the following parts:
1. MLI Ultra battery with 2x M8 bolt + washer + spring washer, for screw connection
2. 1x automotive battery pole positive (thick) + M8 Allen bolt, for clamp connection
3. 1x automotive battery pole negative (thin) + M8 Allen bolt, for clamp connection
4. Handle
5. 2x Attachment strap
6. MasterBus terminator
7. MasterBus cable (1m)
8. Drop cable CZone/MB (1m)
9. Auxiliary cable (2m)
10. The user and installation manual
Never use a damaged battery. If in doubt, contact your supplier.
Location
- Install the MLI Ultra in a well-ventilated room protected against rain, snow, spray, vapor, bilge,
moisture and dust.
- Keep the MLI Ultra away from heat sources. See specifications for allowed operating
temperatures.
- The MLI Ultra must be installed in upright position or on the long side of the case, although upright
mounting is recommended.
Upright position
Long side position
- Keep at least 1cm [3/8"] between two Li-Ion batteries for air flow.
- The MLI Ultra must be secured. The following drawings are examples of mounting options:
With included mounting
straps
Hold-downs on long side
(group 49)
With a frame or tray
11 mm
0.4 inch

10
MLI Ultra 12/1250, 24/1250 –User and Installation Manual
Materials needed
- Battery charger
- Due to Interrupt Rating, use a T-fuse or an MRBF fuse and a fuse holder
- DC wiring
MLI Ultra
12/1250
24/1250
Recommended fuse
200 A
100 A
Recommended wire size
70 mm2 [AWG 2/0]
35mm2 [AWG 2]
WARNING!
The wire and fuse sizes stated in this manual are only guidelines. Cross section
depends on the maximum system current.
Always comply with all local rules and regulations.
Installation procedure for a single unit
WARNING!
In installations with a negative earth: Connect the negative cable last of all to
prevent short circuiting.
WARNING!
Never mount a stud fuse directly to the battery terminal! If there is not enough space,
use a separate bus bar to mount the fuse on.
Step 1. Switch off all loads and chargers.
Step 2. Insert the handle into the recesses on the top of the battery.
Step 3. Out of the box, the battery is on (switch is closed). Press the Battery switch-button to
switch-off (safety disconnect). LED C will blink for 1 minute to indicate that the battery is
switched off and the switch is open.
Step 4. Secure the battery in place.
Step 5. Mount an MRBF fuse holder directly on the battery's POSITIVE terminal, add the fuse and
the POSITIVE cable. Tighten the bolt. Never mount a stud fuse directly on the battery
terminal. Always use the isolated fuse holder! Otherwise the fuse will not work! See the
following figure.

MLI Ultra 12/1250, 24/1250 –User and Installation Manual
11
A. +terminal
B. Fuse holder
C. Fuse
D. Positive cable
E. Plain washer
F. Spring washer
Figure 4: mounting a stud fuse
Connect the negative cable to the –terminal.
Recommended torques: 14.7 –19.6 Nm / 130 –170 InLbs.
Step 6. Option: connect the 6-pin auxiliary connector cable.
Step 7. Option: connect communication cables.
- CZone: connect the drop cable. On the battery side, plug the connectors
into either of the communication ports.
- MasterBus: connect two MasterBus cables (or one cable and one
Terminator).
Step 8. Press the Battery switch-button for 5 seconds to switch the battery on. LED C will be solid
on for 1 minute to indicate that the switch is closed.
Step 9. Switch on some loads and verify that they are working. Switch off the load, switch on the
charger and verify (charger status) that the battery is being charged.
Now the battery is ready for operation.
Adding the MLI Ultra to a MasterBus network
MasterBus is a CAN based, fully decentralized data network for communication between Mastervolt
devices. MasterBus is used as power management system for all connected equipment, such as the
inverter, battery charger, generator and many more. Every device that is compatible with MasterBus
is equipped with two data ports. The devices are simply daisy chained together, forming a local data
network
1. Disconnect a MasterBus cable or Terminator from the closest MasterBus device and connect it
to the MLI Ultra.
2. Connect the new MasterBus cable to the other MasterBus device and then connect to the MLI
Ultra.
3. Ensure that the network is properly terminated.

12
MLI Ultra 12/1250, 24/1250 –User and Installation Manual
Figure 5: MasterBus network example [communication cables]
Adding the MLI Ultra to a CZone network
The CZone network is an NMEA 2000-compliant CAN-based system. In a CZone network, the MLI
Ultra can be monitored from a remote panel like the Touch 5. The settings can only be adjusted with
the CZone Configuration Tool.
Additional required materials per MLI Ultra:
1. Disconnect the backbone at the closest backbone connection and add in a tee connector (not
included).
2. Reconnect the backbone connection(s) with the new tee connector in place. Ensure that the
network is properly terminated.
3. Connect the RJ45 CZone/MB drop cable to the black coupler on the tee and then connect to the
MLI Ultra. On the battery side, plug the connectors into either of the communication ports. LED
B will blink to confirm CZone network identification.
Figure 6: CZone network part

MLI Ultra 12/1250, 24/1250 –User and Installation Manual
13
Auxiliary connector
PIN
WIRE COLOR
FUNCTION
Figure 7: connector
on the MLI Ultra
1
Red
not used
2
Blue
not used
3
Black
Analog SoC output (GND)
4
Yellow
Dry contact. Max rating: 30VDC/1A
5
White
Dry contact (GND)
6
Green
Analog SoC output (0 –10VDC/1mA)
Figure 8: six wire ferruled auxiliary cable
•State of Charge (SoC) indication
Wire pair 3&6 can be used to monitor the SoC on external equipment, where 10V = 100% and
0V = 0%. To enable this, select the "SOC 10V out" option in the Configuration tab, see page 16.
•Remote switch (dry contact)
Wire pair 4&5 can be used to control an external device like a switch, relay or lamp. This is done
in combination with a MasterBus event command or CZone circuit.
5. CONFIGURATION
Fresh out of the box, the MLI Ultra is suitable for use in a MasterBus network or as a stand-alone
battery. For CZone and for advanced features, the settings must be adjusted. Most settings can be
done through DIP switches. Advanced or network settings are done from a Windows laptop or
notebook with either the free MasterAdjust or the CZone configuration tool. MasterAdjust software
can be downloaded at www.mastervolt.com. The CZone Configuration Tool software is available to
technical CZone customers from the CZone Portal.
DIP switch settings
DIP switch 1 = CZone network (0) or MasterBus network (1).
DIP switch 2 = MasterBus powering off (0) or on (1)
DIP switches 3 to 10 are either used as CZone address or for MasterBus settings.
RED
BLUE
YELLOW
GREEN
BLACK
WHITE
GND
GND
VDC
0-10V
RELAY

14
MLI Ultra 12/1250, 24/1250 –User and Installation Manual
MasterBus DIP switch settings
By default, the battery is in MasterBus mode (DIP switch 1=on) with MasterBus powering enabled
(DIP switch 2=on). DIP switches 9 and 10 are not used in MasterBus.
DIP switch
3
4
5
6
7
8
Event-based 'stop charge' can be setup per charger
Automatic 'stop charge' for ALL Mastervolt chargers
(see section "Stop Charge event" on page 19)
0
1
Cluster setting for multi-unit configuration:
Stand-alone
Replica unit
Primary 12V unit
Primary 24V unit
Primary 36V unit
Primary 48V unit
(see section "Clustering multiple batteries” on page 24)
0
0
0
0
1
1
0
0
1
1
0
0
0
1
0
1
0
1
Auto switch-on feature enabled
Auto switch-on feature disabled
0
1
No voltage on the poles even when the internal relay is open
A voltage can be measured when the internal relay is open
0
1
Charged by a non-Mastervolt charger
If the battery is switched-off, there will be no voltage at the poles and some chargers will not start
charging. In this case, the MLI Ultra can put some voltage on the terminals. This explains why some
voltage on the terminals can be measured even though the battery is switched-off.
CZone DIP switch settings
1. Set DIP switch 1 to the OFF position (0).
2. Set DIP switch 2 to the OFF position (0).
3. Set DIP switches 3 to 10 to match the unique 'dipswitch' number, used in the CZone network.
How to change the DIP switch settings
Figure 9: DIP switches
1. Remove the DIP switch cover by loosening the four screws.
2. Use a small screwdriver to carefully change the DIP switch position.
3. Replace the DIP switch cover and fasten with the screws. Make sure that the rubber band is
placed correctly, to make it watertight.

MLI Ultra 12/1250, 24/1250 –User and Installation Manual
15
Configuration in a MasterBus network
A display like the SmartRemote or EasyView 5, can be used to monitor the MLI Ultra. Advanced
configuration can be done in MasterAdjust, from a Windows laptop or notebook connected to the
MLI Ultra via a Mastervolt USB Interface. The following tables list the parameters as shown in
MasterAdjust.
Monitoring tab
Menu
Description
Battery/Cluster
State of charge
Battery state of charge in %
Time remaining
Time of battery use left at the actual load in hh:mm:ss
Voltage
Battery voltage measured by the cell management system
Current
Current measured by the cell management system
Positive value: charging, negative value: discharging
Temperature
Internal temperature of the battery in °C
Relay
Relay close
Button to close the battery switch.
Relay open
Button to open the battery switch.
Relay state
State of the battery switch: open / close / not connected
Note: you need to login as installer to see all following parameters.
Installer
Battery safety
Indication of the occurrence of a Battery Safety event
Stop charge
Indication of the occurrence of a Stop charge event
MB power
Indication whether MasterBus powering is on or off
Voltage
Cell 1 … 8
Voltage of the individual cells
Balancer
Balancer 1…8 act.
Indication of active balancing of the individual cells
Temperature
Temperature
Temperature of cells 1, 2-3, 4-5, 6-7, 8
Alarms tab
Menu
Description
Generic
Battery safety
Indication of the occurrence of a Battery Safety event
Overcurrent
Battery current is >600A for more than 30 seconds. Reduce load immediately
Short circuit
Indication of a short circuit in the MLI Ultra
Capacity low
This alarm is raised when the State of charge (SoC) drops below a preset
value (10% by default)
Cap. Very low
Indicates that the State of charge drops below a preset value (0% by default)

16
MLI Ultra 12/1250, 24/1250 –User and Installation Manual
History tab
Menu
Description
Cycle count
The number of cycles so far
Last time 100%
Date of the last time that the MLI Ultra was fully charged
Max. Ah used
The maximum used capacity that the MLI Ultra saw
UBat lowest
The lowest battery voltage that the MLI Ultra saw
UBat highest
The highest battery voltage that the MLI Ultra saw
Configuration tab
Menu
Description
Default
Adjustable
range
Name
Name of this device. This name will be
recognized by all devices connected to the
MasterBus network
MLI[serial
number]
0-12 chars
Language
Menu language of this device
English
English, Dutch
DIP switches
Status of the DIP switches
(read only)
CZone enabled
Select this option if the MLI Ultra is part of a
CZone network. In this case DIP switch 1
must be OFF.
Serial number
Serial number of the MLI Ultra
(read only)
Auto close
Select this option for automatic control of
the battery switch.
Processor
Version
Firmware main version
(read only)
Revision
Product version
(read only)
Note: you need to login as installer to see all following parameters.
Cluster
See also section "Clustering multiple batteries”on page 24
Nr. in series
The number of batteries in series
1
1-10
Nr. in parallel
The number of batteries in parallel
1
1-24
Confirm
topology button
Button to confirm the number of batteries in
series and/or parallel
Event levels
Capacity low
Level below which the Capacity low event
can be triggered
10%
0-100
Cap. very low
Level below which the Cap. very low event
can be triggered
0%
0-100%
Battery full
Level above which the Battery full event can
be triggered
100
0-100%
High
temperature
Internal temperature of the MLI Ultra serves
as an event source
45°C
30-60°C
Low
temperature
Internal temperature of the MLI Ultra serves
as an event source
5°C
30-60°C
Voltage low
Level below which the Voltage low event
can be triggered
12.5V
25.0V
12.25-12.75V
24.5-25.5V

MLI Ultra 12/1250, 24/1250 –User and Installation Manual
17
Menu
Description
Default
Adjustable
range
Volt. low delay
Delay time to trigger the Voltage low event
after the level was reached
10s
1-120s
Last time 100%
Last time fully charged serves as an event
source. To prevent damage the batteries
must be charged to the full 100% regularly.
It is a common misconception that Lithium-
Ion batteries should not be fully charged.
31 days
7-60 days
Installer
DOD
To optimize the battery cycle life, the Depth
of Discharge (DOD) is set to 80%.
80%
20-100%
CAUTION!
Changing the DoD to 100% will decrease the cycle life.
MB power
Off: MasterBus powering disabled.
Automatic: MasterBus power will be
switched off when the main current is in
between 1.0A and -1.0A for more than 24
hours and the battery voltage has dropped
below the float voltage.
Always on: the MLI Ultra will power the
MasterBus network. Note that this will
slowly drain the battery.
This option is only available if DIP switch 2
is ON (see page 20).
Off
Off / Automatic /
Always on
SOC 10V out
Select this option if the auxiliary connector
is used to display the State of Charge.
Test batt safety
Button to test if the battery switches-off
when the 'battery safety'-conditions are met.
Test stop
charge
Button to test if the chargers stop charging
when the 'stop charge'-conditions are met.
Factory reset
Button to reset the MLI Ultra to its default settings
Events tab
With MasterBus a device can be programmed to initiate an action at another connected device that
supports MasterBus. This is very helpful in automation of your system and is done by means of
event-based commands.
In the Events tab you can program the MLI Ultra to act as an event source. Events which occur
during the operation of the MLI Ultra will then trigger actions from other devices.

18
MLI Ultra 12/1250, 24/1250 –User and Installation Manual
Field
Description
Value
Event x source
Select an event that triggers an action, for example
Relay open.
See Event
source list
Event x target
Select the device that should act, for example the
charger.
Selectable
targets are
device
dependent
Event x command
Select the parameter that must be changed on the
target device, for example No connection.
See command
list of the
selected
device
Event x data
Data translates the input into an output.
•On: status changes to On at first input signal.
•Off: status changes to Off at first input signal.
•Copy: status follows input signal.
•Copy invert: status follows opposite of input.
•Toggle: status changes at 1st signal and back at the
2nd.
Off, On, Copy,
Copy Invert,
Toggle
Events sources
Event source
Condition
Comments
Disabled
(no event programmed)
Battery Safety
Battery Safety event occurred and the
safety relay is triggered to disconnect
the battery from loads and charger.
See page 28Error! Bookmark not
defined. for what to do if the battery
was switched-off.
Stop charge
Battery voltage > 14.5V/29V (12V/24V
battery), or voltage or temperature of
one of the individual cells is too high.
Strongly recommended event!
Charging
Battery charging current > 1A
Indicates that the battery is being
charged
On
Input
Off
Copy
Toggle
Copy
invert

MLI Ultra 12/1250, 24/1250 –User and Installation Manual
19
Event source
Condition
Comments
Capacity low
State of Charge < Capacity low
See Configuration tab - Event levels
for adjustment of the threshold level
Capacity very
low
State of Charge < Capacity very low
See Configuration tab - Event levels
for adjustment of the threshold level
See the related step of the
installation procedure.
Battery full
State of Charge > Battery full.
See Configuration tab - Event levels
for adjustment of the threshold level
Battery > 20%
State of Charge > 19.5 %
Can be used to control the LEDs on
a MasterBus display for example
Battery > 40%
State of Charge > 39.5 %
Battery > 60%
State of Charge > 59.5 %
Battery > 80%
State of Charge > 79.5 %
Battery 100%
State of Charge > 99.5 %
High
temperature
Internal temperature of the MLI Ultra
is too high
See Configuration tab - Event levels
for adjustment of the threshold level
Low
temperature
Internal temperature of the MLI Ultra
is too low
See Configuration tab - Event levels
for adjustment of the threshold level
Voltage low
Battery or cell voltage is too low.
See Configuration tab - Event levels
for adjustment of the threshold level
Last time 100%
Last time the MLI Ultra was fully
charged
See Configuration tab - Event levels
for adjustment of the threshold level
Relay open
Relay open event occurred
Relay close
Relay close event occurred
Overcurrent
Battery over-current event occurred
Event commands
When the MLI Ultra is configured as an event target by another device, this device can initiate an
event command and an event action to be performed by the MLI Ultra.
Event command
Meaning
Relay open
The battery safety relay will be opened.
Relay close
The battery safety relay will be closed.
Heat pad on
Turn on the heat pad of the MLI Ultra (provided that the temperature of the
MLI Ultra is below 0°C [32°F]).
Dry contact open
Opening of relay wire pair 4&5 of the auxiliary cable.
Dry contact close
Closure of relay wire pair 4&5 of the auxiliary cable.
Stop Charge event
Before the battery reaches the limits of the operating specifications, the Stop Charge event is
triggered. When configured, this event forces the Mastervolt charger to switch to the float stage. The
charger will use a lower charger voltage or, in case of parallel connection, switch off. The event will
be active for 10 minutes.

20
MLI Ultra 12/1250, 24/1250 –User and Installation Manual
Stop charge can also be selected by settings DIP switch 3 ON. In this case, all connected Mastervolt
chargers will stop charging when a 'Stop charge'-condition is met.
Capacity Very Low event
A Capacity very low-alarm (built-in at 0% SoC by default) automatically triggers the safety relay.
When the alarm condition is corrected, reset the safety relay to resume normal operation.
If an alternator is part of the charging system, configure the Cap. very low-event. This pauses the
charging process until the alarm condition is corrected.
How to activate MasterBus powering
This is done in two parts:
•First, set the DIP switches.
•Secondly, open MasterAdjust on a notebook/laptop or PC, connected to the MasterBus network
via a USB Interface.
Part 1; DIP switches
1. Remove the DIP switch cover by loosening the four screws.
2. Use a small screwdriver to carefully set the DIP switches:
•Set DIP switch 1 ON, to select MasterBus.
•Set DIP switch 2 ON, to activate MasterBus powering.
3. Replace the DIP switch cover and fasten with the screws. Make sure that the rubber band is
placed correctly, to make it watertight.
Part 2; MasterAdjust
4. When the MLI Ultra is connected to MasterBus, open MasterAdjust.
5. Right-click the MLI Ultra and select Login.
6. Select Installer and enter the installer code.
7. Go to the Configuration tab.
8. From the MB power drop-down list, select Automatic or Always on.
Automatic: MasterBus power will be switched off when the main current is in between 1.0A and -
1.0A for more than 24 hours and the battery voltage has dropped below the float voltage.
Always on: the MLI Ultra will always power the MasterBus network. Note that this will slowly
drain the battery.
9. Close MasterAdjust.