Mastervolt ChargeMaster Plus 12/35-3 Operating manual

CHARGEMASTER PLUS
ChargeMaster Plus 12/35-3, 12/50-3, 24/20-3, 24/30-3
AUTOMATIC BATTERY CHARGER
USER AND INSTALLATION MANUAL
10000016594/04
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ChargeMaster Plus 12/35-3, 12/50-3, 24/20-3, 24/30-3 –User and Installation Manual
TABLE OF CONTENTS
1GENERAL INFORMATION ......................... 3
1.1 Use of this manual.................................... 3
1.2 Liability....................................................... 3
1.3 Warranty .................................................... 3
1.4 Disclaimer.................................................. 3
1.5 Identification label .................................... 3
1.6 Correct disposal of this product............. 3
2SAFETY INSTRUCTIONS........................... 4
2.1 General ...................................................... 4
2.2 Explosive gases ........................................ 4
2.3 Personal precautions ............................... 5
2.4 Warnings regarding the use of batteries5
2.5 Charger location....................................... 5
2.6 DC connection precautions .................... 5
2.7 When battery is installed in vehicle ....... 6
2.8 When battery is outside vehicle ............. 6
2.9 Preparing to charge ................................. 6
2.10Grounding instructions ............................ 7
2.11Warning regarding life support
applications ............................................... 7
3INSTALLATION .......................................... 8
3.1 Unpacking ................................................. 8
3.2 Location ..................................................... 8
3.3 Wiring......................................................... 8
3.3.1 DC wiring......................................... 8
3.3.2 AC wiring......................................... 9
3.3.3 AC safety grounding...................... 9
3.3.4 Network wiring
(CZone/MasterBus)................................ 10
3.4 Batteries................................................... 10
3.5 Material needed...................................... 10
3.6 Overview of the connection
compartment........................................... 11
3.7 Connection example.............................. 12
3.8 Installation step-by-step......................... 13
3.9 Commissioning after installation .......... 15
4SETTINGS.................................................16
4.1 DIP switch settings ................................. 16
4.2 MasterBus configuration ....................... 16
4.2.1 Monitoring ..................................... 16
4.2.2 Alarms............................................ 17
4.2.3 History............................................ 17
4.2.4 Configuration settings.................. 18
4.2.5 Events –System automation ...... 19
4.2.6 Current control ............................. 20
4.3 MasterShunt............................................ 20
4.4 Lithium-ion Battery MLI Ultra................ 20
4.5 CZone configuration .............................. 20
5OPERATING INSTRUCTIONS ..................22
5.1 Introduction ............................................. 22
5.2 Switching on / off.................................... 22
5.3 Status display.......................................... 22
5.4 The 3-step+ charge process................. 23
5.4.1 Charge voltages ........................... 24
5.4.2 Pre-float ......................................... 24
5.4.3 Temperature compensated
charging................................................... 24
5.4.4 Flat battery support...................... 24
5.5 DC OUT ................................................... 24
5.6 Maintenance............................................ 24
5.7 Storage .................................................... 25
6TROUBLE SHOOTING..............................26
7TECHNICAL DATA ...................................28
7.1 Specifications 12V models.................... 28
7.2 Specifications 24V models.................... 29
7.3 Dimensions.............................................. 30
7.4 Characteristics........................................ 30

ChargeMaster Plus 12/35-3, 12/50-3, 24/20-3, 24/30-3 –User and Installation Manual
3
1GENERAL INFORMATION
1.1 Use of this manual
This manual serves as a guideline for the safe
and effective operation and maintenance of the
following ChargeMaster Plus models:
Part number
Model
44310355
12/35-3
44310505
12/50-3
44320205
24/20-3
44320305
24/30-3
These models are further referred to as
“ChargeMaster Plus”.
1.2 Liability
Advanced Systems Group can accept no liability
for:
•Consequential damage resulting from the use
of the ChargeMaster Plus.
•Possible errors in the included manual and
the consequences of these.
•Use that is inconsistent with the purpose of
the product.
1.3 Warranty
The Advanced Systems Group product warranty
covers the ChargeMaster Plus 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 do 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.
1.4 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
most current Terms & Conditions of Sale.
1.5 Identification label
The following picture is only an example!
Part number Serial number.
Figure 1: Identification label
The identification label is located at the right-
hand side of the ChargeMaster Plus. Important
technical information required for service,
maintenance & secondary delivery of parts can
be derived from the identification label.
CAUTION!
Never remove the identification
label. This will void the warranty.
1.6 Correct disposal of this product
This product is designed and
manufactured with high quality
materials and components,
which can be recycled and
reused.
Please be informed about the local separate
collection system for electrical and electronic
products.
Please 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.

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ChargeMaster Plus 12/35-3, 12/50-3, 24/20-3, 24/30-3 –User and Installation Manual
2SAFETY INSTRUCTIONS
IMPORTANT SAFETY INSTRUCTIONS
SAVE THESE INSTRUCTIONS
WARNING!
Read the entire manual before
using the ChargeMaster Plus.
Keep this manual in a secure
place.
This chapter describes important safety and
operating instructions for use of a ChargeMaster
Plus in residential, recreational vehicle (RV) and
marine applications.
2.1 General
1The appliance is not to be used by children or
persons with reduced physical, sensory or
mental capabilities, or lack of experience and
knowledge, unless they have been given
supervision or instruction.
2This appliance can be used by children aged
from 8 years and above and persons with
reduced physical, sensory or mental capa-
bilities or lack of experience and knowledge,
if they have been given supervision or instruc-
tion concerning use of the appliance in a safe
way and understand the hazards involved.
3Children shall not play with the appliance.
4Cleaning and user maintenance shall not be
made by children without supervision.
5To reduce the risk of electric shock –Do not
expose the ChargeMaster Plus to rain, snow,
spray, moisture, excessive pollution and
condensing circumstances. To reduce risk of
fire hazard, do not cover or obstruct the
ventilation openings. Do not install the
ChargeMaster Plus in a non-ventilated room,
as overheating may result.
6Use of an attachment or spare part not
recommended or sold by Advanced Systems
Group may result in a risk of fire, electric
shock, or personal injury.
7UL 1236 requirements do not cover investiga-
tion of charging Lithium-ion type batteries.
8The ChargeMaster Plus is designed to be
permanently connected to an AC and DC
electrical system. Installation of, and work on
the ChargeMaster Plus, may be carried out
only by qualified and trained personnel,
consistent with the locally applicable
standards and regulations.
9Make sure that all wiring is properly installed,
in good electrical condition, and correctly
sized to match the AC ampere rating of the
ChargeMaster Plus. Check the wiring on a
regular base, at least once a year. Do not use
the ChargeMaster Plus when the wiring is
undersized or damaged.
10 Do not operate the ChargeMaster Plus if it has
received a sharp blow, been dropped, or
otherwise damaged in any way; take it to a
qualified serviceman.
11 Except for the connection compartment, see
chapter 3, the ChargeMaster Plus may not be
opened or disassembled. There are no
serviceable parts inside the cabinet. Take it to
a qualified, authorized and trained serviceman
when service or repair is required. Incorrect
reassembly may result in a risk of electric
shock or fire.
12 To reduce risk of electric shock, disconnect
the ChargeMaster Plus from both AC and DC
electrical system before attempting any
maintenance or cleaning. Turning off controls
will not reduce this risk. Be sure that third
parties cannot reverse the measures taken.
13 The ChargeMaster Plus must be provided
with an equipment-grounding conductor to
the AC input ground terminal. Grounding and
all other wiring must comply with local codes
and ordinances.
14 Short circuiting or reversing polarity will lead
to serious damage to batteries, ChargeMaster
Plus, wiring as well as accessories. Fuses
cannot prevent damage caused by reversed
polarity and the warranty will be void.
15 In case of fire, you must use the fire extin-
guisher which is appropriate for electrical
equipment.
16 If applied in a marine application in the United
States, external connections to the
ChargeMaster Plus shall comply with the
United States Coast Guard Electrical
Regulations (33CFR183, Sub part I).
2.2 Explosive gases
1WARNING –RISK OF EXPLOSIVE
GASES. WORKING IN VICINITY OF A
LEAD-ACID BATTERY IS DANGEROUS.

ChargeMaster Plus 12/35-3, 12/50-3, 24/20-3, 24/30-3 –User and Installation Manual
5
BATTERIES GENERATE EXPLOSIVE
GASES DURING NORMAL BATTERY
OPERATION. FOR THIS REASON, IT IS
OF UTMOST IMPORTANCE THAT EACH
TIME BEFORE USING THE ChargeMaster
Plus, YOU READ THIS MANUAL AND
FOLLOW THE INSTRUCTIONS
EXACTLY.
2To reduce risk of battery explosion, follow
these instructions and those published by
battery manufacturer and manufacturer of
any equipment you intend to use in vicinity of
the battery. Review cautionary marking on
these products and on engine.
3DANGER: To reduce the risk of
explosion –Never use the ChargeMaster
Plus in situations where there is danger of
gas or dust explosion or area in which
ignition-protected equipment is required.
2.3 Personal precautions
1Consider having someone close enough by to
come to your aid when you work near a lead-
acid battery.
2Have plenty of fresh water and soap nearby in
case battery acid contacts skin, clothing, or
eyes.
3Wear eye and clothing protection. Avoid
touching eyes while working near battery.
4If battery acid contacts skin or clothing, wash
immediately with soap and water. If acid
enters eye, immediately flood eye with
running cold water for at least 10 minutes and
get medical attention immediately.
5NEVER smoke or allow a spark or flame in
vicinity of battery or engine.
6Be extra cautious to reduce risk of dropping a
metal tool onto battery. It might spark or short-
circuit battery or other electrical part that may
cause explosion.
7Do not wear watches, bracelets, necklaces or
other metal objects when working on
batteries.
2.4 Warnings regarding the use of
batteries
1Only use the ChargeMaster Plus for charging
Lead-Acid or lithium-ion batteries and the
supply of consumers attached to these
batteries, in permanent systems. Do not use
the ChargeMaster Plus for charging dry-cell
batteries that are commonly used with home
appliances. These batteries may burst and
cause injury to persons and damage to
property. Make sure lithium-ion batteries used
for this charger are certified to EN standards.
2NEVER charge non-rechargeable batteries.
3NEVER charge a frozen battery.
4Excessive battery discharge and/or high
charging voltages can cause serious damage
to batteries. Do not exceed the recommended
limits of discharge level of your batteries.
5If it is necessary to remove a battery, always
remove grounded terminal from battery first.
Make sure all accessories are off, so as not to
cause an arc.
6Be sure that the area around battery is well
ventilated while battery is being charged.
Refer to the recommendations of the battery
manufacturer.
7Batteries are heavy! It may become a
projectile if it is involved in an accident!
Ensure adequate and secure mounting and
always use suitable handling equipment for
transportation.
2.5 Charger location
1Never place charger directly above battery
being charged; gases from battery will
corrode and damage charger.
2Never allow battery acid to drip on charger
when reading electrolyte specific gravity or
filling battery.
3Do not operate charger in a closed-in area or
restrict ventilation in any way.
4Do not set a battery on top of charger.
2.6 DC connection precautions
1Connect and disconnect DC output clips only
after setting any charger switches to
“off” position and removing AC cord from
electric outlet. Never allow clips to touch each
other.
2Attach clips to battery and chassis as
indicated in section 2.7, steps 5 and 6, and 2.8
steps 2 through 4.

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ChargeMaster Plus 12/35-3, 12/50-3, 24/20-3, 24/30-3 –User and Installation Manual
2.7 When battery is installed in vehicle
A SPARK MAY CAUSE BATTERY EXPLOSION.
To reduce risk of a spark near battery:
1Position AC and DC cords to reduce risk of
damage by hood, door, or moving engine
part.
2Stay clear of fan blades, belts, pulleys, and
other parts that can cause injury to persons.
3Check polarity of battery posts. POSITIVE
(POS, P, +) battery post usually has larger
diameter than NEGATIVE (NEG, N, –) post.
4Determine which post of battery is grounded
(connected) to the chassis. If negative post is
grounded to chassis (as in most vehicles), see
(5). If positive post is grounded to the chassis,
see (6).
5For negative-grounded vehicle, connect
POSITIVE (RED) clip from battery charger to
POSITIVE (POS, P, +) ungrounded post of
battery. Connect NEGATIVE (BLACK) clip to
vehicle chassis or engine block away from
battery. Do not connect clip to carburetor, fuel
lines, or sheet-metal body parts. Connect to a
heavy gage metal part of the frame or engine
block.
6For positive-grounded vehicle, connect
NEGATIVE (BLACK) clip from battery charger
to NEGATIVE (NEG, N, –) ungrounded post of
battery. Connect POSITIVE (RED) clip to
vehicle chassis or engine block away from
battery. Do not connect clip to carburetor, fuel
lines, or sheet-metal body parts. Connect to a
heavy gage metal part of the frame or engine
block.
7When disconnecting charger, turn switches to
off, disconnect AC cord, remove clip from
vehicle chassis, and then remove clip from
battery terminal.
8See operating instructions for length of
charge information.
2.8 When battery is outside vehicle
A SPARK MAY CAUSE BATTERY EXPLOSION.
To reduce risk of a spark near battery:
1Check polarity of battery posts. POSITIVE
(POS, P, +) battery post usually has a larger
diameter than NEGATIVE (NEG, N, –) post.
2Attach at least a 24-inch-long 6-gauge (AWG)
insulated battery cable to NEGATIVE (NEG, N,
–) battery post.
3Connect POSITIVE (RED) charger clip to
POSITIVE (POS, P, +) post of battery.
4Position yourself and free end of cable as far
away from battery as possible –then connect
NEGATIVE (BLACK) charger clip to free end
of cable.
5Do not face battery when making final
connection.
6When disconnecting charger, always do so in
reverse sequence of connecting procedure
and break first connection while as far away
from battery as practical.
2.9 Preparing to charge
1If it is necessary to remove battery from
vehicle to charge, always remove grounded
terminal from battery first. Make sure all
accessories in the vehicle are off, so as not to
cause an arc.
2Be sure area around battery is well ventilated
while battery is being charged.
3Clean battery terminals. Be careful to keep
corrosion from coming in contact with eyes.
4Add distilled water in each cell until battery
acid reaches level specified by battery
manufacturer. Do not overfill. For a battery
without removable cell caps, such as valve
regulated lead acid batteries, carefully follow
manufacturer’s recharging instructions.
5Study all battery manufacturer’s specific
precautions while charging and
recommended rates of charge.
Note that the ChargeMaster Plus charge
specifications are based on Mastervolt
batteries. Specifications for a given chemistry
of a different manufacturer may vary. If
connecting batteries of a different
manufacturer, make sure the manufacturer's
recommendations are met.
6Determine voltage of battery by referring to
car owner’s manual and make sure that
output voltage selector switch is set at correct
voltage. If charger has adjustable charge rate,
charge battery initially at lowest rate.
Exception: For a charger not having an output
voltage selector switch, determine voltage of

ChargeMaster Plus 12/35-3, 12/50-3, 24/20-3, 24/30-3 –User and Installation Manual
7
battery by referring to car owner’s manual and
make sure it matches output rating of battery
charger.
2.10 Grounding instructions
This battery charger should be connected to a
grounded, metal, permanent wiring system; or an
equipment-grounding conductor should be run
with circuit conductors and connected to
equipment-grounding terminal or lead on battery
charger. Connections to battery charger should
comply with all local codes and ordinances.
2.11 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
Advanced Systems Group. 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 Advanced
Systems Group responsible for any claims
arising from the use of the Mastervolt parts in the
life support equipment.

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ChargeMaster Plus 12/35-3, 12/50-3, 24/20-3, 24/30-3 –User and Installation Manual
3INSTALLATION
During installation and commissioning, the safety
instructions are applicable at all times.
3.1 Unpacking
In addition to the ChargeMaster Plus the delivery
includes:
•Mounting bracket to mount the ChargeMaster
Plus to a wall;
•Battery temperature sensor;
•Drop cable CZone/MB (1m);
•MasterBus Terminator;
•User and installation manual.
After unpacking, check the contents for possible
damage. Do not use the product if it is damaged.
If in doubt, contact your supplier
Check from the identification label (see section
1.5) whether the battery voltage is the same as
the nominal output voltage of the ChargeMaster
Plus (e.g. 24V battery set for a 24V battery
charger).
3.2 Location
•The ChargeMaster Plus is designed for indoor
use only.
•Ambient temperature: -25°C ... 80°C / -13°F …
176°F; (power derating above 40°C / 104°F to
decrease the internal heat sink temperature).
•Humidity: 0-95% non-condensing
•Mount the ChargeMaster Plus vertically, with
the connecting cables downwards.
•Do not expose the ChargeMaster Plus to
excessive dust, aggressive environments,
ammonia or salt.
•Make sure that the hot air that is developed
during operation can be discharged. The
ChargeMaster Plus must be mounted in such
a way that obstruction of the airflow through
the ventilation openings will be prevented.
•This device requires a minimum of 100mm
(4") of clearance on every side.
•If added to a CZone or MasterBus network,
take the network powering into consideration.
•Never place the ChargeMaster Plus directly
above the battery being charged, as gases
from battery will corrode and damage the
ChargeMaster Plus.
•If the ChargeMaster Plus is installed in the
immediate vicinity of living areas, take into
account that even though we took the highest
care, the fan of the ChargeMaster Plus can
produce noise when operating.
•Although the ChargeMaster Plus fully
complies with all applicable EMC limits, it may
still cause harmful interference to radio
communication equipment. If such interfe-
rence appears, it is recommended to increase
the separation between the ChargeMaster
Plus and the equipment, to relocate the
receiving antenna or to connect the
equipment to a circuit different from that to
which the ChargeMaster Plus is connected.
3.3 Wiring
WARNING!
The wire sizes stated in this
manual are given as guideline
only. Always comply with all local
rules and regulations.
3.3.1 DC wiring
Keep in mind that high current will pass through
the DC wiring. Keep the cable length as short as
possible, this will keep the system efficiency as
high as possible. The recommended minimum
cross section of the battery cables is:
ChargeMaster
Plus model
DC Cable cross section:
<3m
10ft
3-5m
10-16ft
12/35-3
10 mm²
8AWG
16 mm²
6AWG
12/50-3
16 mm²
6AWG
25 mm²
4AWG
24/20-3
6 mm²
10 AWG
10 mm²
8AWG
24/30-3
10 mm²
8AWG
16 mm²
6AWG
0
20
40
60
80
100
120
-50 -40 -30 -20 -10
0
10 20 30 40 50 60 70 80 90
100
Output Power (%)
Temperature (°C)
Output Power vs Temperature

ChargeMaster Plus 12/35-3, 12/50-3, 24/20-3, 24/30-3 –User and Installation Manual
9
Use the following wire colors for DC wiring color
or at least different colors to make a clear
distinction between the positive and negative
wire from the battery:
Wire color
Meaning
Connect to:
Red
Positive
+ (POS)
Black
Negative
–(NEG)
Run the positive and negative cables next to
each other to limit the electromagnetic field
around the cables. The negative cable should be
connected directly to the negative post of the
battery bank or the ground side of a current
shunt. Do not use the chassis frame as the
negative conductor. Tighten securely. The
positive battery cable must be fused and
connected to the positive post of the battery
bank.
The recommended DC fuses for DC 1/2/3 OUT
are:
Model
DC fuse
Model
DC fuse
12/35-3
40 A
24/20-3
25 A
12/50-3
60 A
24/30-3
40 A
The fuse with the fuse-holder is available from
your local Mastervolt distributor or Customer
Service Representative.
3.3.2 AC wiring
WARNING!
On first connecting to power,
make sure the ChargeMaster
Plus is in a well-ventilated area as
it might spark.
For a safe installation the correct wire cross
section must be applied. Don’t use a cross
section that is smaller than indicated. See the
following table to select the appropriate cross
section for the AC wiring (up to 6m / 20ft length):
Wire size
Max. current
Solid wire (3x)
1.5 –6 mm2
14 –10 AWG
15A
Stranded wire (3x)
1.5 –6 mm2
14 –8 AWG
15A
Ferruled wire (3x)
1.5 –4 mm2
14 –10 AWG
15A
Connection of AC wiring and recommended wire
colors:
•240VAC, 50/60Hz installations:
Wire color
Meaning
Must be
connected to:
Brown or
black
Phase
L
Blue
Neutral
N
Green/Yellow
Earth
•120VAC, 50/60Hz installations (single phase):
Wire
color
Meaning
Must be
connected to:
Black
Hot or Line
L
White
Neutral
N
Green
Ground
•240VAC,50/60Hz (split phase 120/240VAC):
Wire
color
Meaning
Must be
connected to:
Black
Hot or Line
L1
Red
Hot or Line
L2
Green
Ground
Note: An accessible disconnection device
(switch or circuit breaker for example)
must be incorporated in the AC wiring, in
accordance with wiring rules.
3.3.3 AC safety grounding
WARNING!
The ground wire offers protection
only if the enclosure of the
ChargeMaster Plus is connected
to the safety ground. Connect the
ground terminal (PE / GND) to the
hull, chassis or Distribution
Apparatus.
CAUTION!
According to local regulations an
RCD/Breaker (also known as
GFCI) must be placed in the AC
input circuit of the ChargeMaster
Plus.
For Australia and New Zealand, the
wiring rules are in accordance with
AS/NZS 3000.

10
ChargeMaster Plus 12/35-3, 12/50-3, 24/20-3, 24/30-3 –User and Installation Manual
3.3.4 Network wiring (CZone/MasterBus)
The ChargeMaster Plus can be connected to a
CZone or MasterBus network. Use an RJ45 Drop
cable CZone/MB or MasterBus cable and daisy
chain the ChargeMaster Plus to the other
devices, forming a local data network. Both
networks need a terminating device on both
ends of the network. Do not make ring networks
or T-connections.
•CZone network
Points to consider:
˗Up to 40 devices can be connected together
on a single backbone.
˗Make sure the CZone network has two
terminating resistors, one at each open end
of the backbone.
˗The electric power for the network comes
from a battery or power supply. Make sure
that it delivers enough power and is
positioned as close to the middle of the
backbone as possible to reduce voltage
drop.
•MasterBus network
Points to consider:
˗Connections between the devices are made
by standard MasterBus cables (straight
UTP). Advanced Systems Group can supply
these cables.
˗Up to 63 MasterBus devices can be
connected together.
˗The electric power for the network comes
from the connected devices according to the
rule: 1powering / 3 non-powering. Spread
the powering devices over the network.
For more details on networks, please contact
your Mastervolt supplier.
3.4 Batteries
Always follow the instructions published by the
battery manufacturer.
Model
Minimum
battery
capacity
MVG
(Mastervolt Gel
battery)
12/35-3
70 Ah
85
12/50-3
100 Ah
120
24/20-3
40 Ah
55
24/30-3
60 Ah
85
3.5 Materials needed
Make sure you have all the parts you need to
install the ChargeMaster Plus:
•ChargeMaster Plus (included).
•Battery temperature sensor with cable and
plug (included).
•DC cables to connect the ChargeMaster Plus
to the batteries and common negative; see
section 3.3.1 for specifications.
•DC fuse holder with a DC fuse, to be
integrated in the positive DC cable; see
section 3.3.1 for specifications.
•Screws/bolts (Ø 6mm with plugs) to mount
the ChargeMaster Plus to a surface. Use
mounting materials which are suitable to carry
the weight of the ChargeMaster Plus.
•AC cable to connect the AC input to an AC
power source. See section 3.3.2.
•Batteries. See section 3.4.
•Appropriate and reliable cable terminals,
cable lugs, battery terminals and cord end
terminals.
•For CZone setup, an RJ45-M12 Drop cable
CZone/MB (included) and a tee connector
(not included). When connecting several
drop cables in a similar location, use a 2-way
or 4-way tee connector
•For MasterBus setup, an RJ45 MasterBus
cable (not included).
We recommend as a minimum tool kit:
•Socket wrench (10mm) to fix the main DC
cables.
•Socket wrench (10mm) to fix the Safety
ground connection.
•Flat blade screwdriver (3mm or 1/8") to fix the
spring-clamp terminals of the AC wiring.
•Tools to fix the screws / bolts (Ø 6mm) with
plugs to mount the ChargeMaster Plus to a
surface.
•Philips screwdriver number 2 to open the
connection compartment.

ChargeMaster Plus 12/35-3, 12/50-3, 24/20-3, 24/30-3 –User and Installation Manual
11
3.6 Overview of the connection compartment
1. Spring cage terminal AC input
2. Strain relief for AC wiring (M3)
3. Safety ground connection 1*
4. Safety ground connection 2*
5. M6 Positive terminal charge output
1; DC 1 OUT
6. M6 Positive terminal charge output
2; DC 2 OUT
7. M6 Positive terminal charge output
3; DC 3 OUT
8. Common negative output terminal
9. DIP switches
10. Network connection
(CZone/MasterBus)
11. Temperature sensor connection
Figure 2: Connections
* There are two safety ground connections. Use only one of them. For details see section 3.7 Connection
example.

12
ChargeMaster Plus 12/35-3, 12/50-3, 24/20-3, 24/30-3 –User and Installation Manual
3.7 Connection example
This schematic illustrates the general placement of the ChargeMaster Plus in a circuit. It is not meant to
provide detailed wiring instructions for any particular electrical installation.
Figure 3: Installation drawing of the ChargeMaster Plus
* Use only one of the two options.
When installing the AC wires, keep extra length available for the PE, ensuring the PE will be the last
wire to get taut if the wire slips through the anchorage.
Notes:
- If the battery temperature remains within 15-25°C (59-77°F), connection of the battery temperature
sensor is optional.
- Lithium-ion batteries require no temperature sensor.
- If creating a parallel system of multiple ChargeMaster Plus units, the units should be excluded from any
isolation measurement system.
CZone/MasterBus
Network
RCD/Breaker
L1
N/L2
PE/GND* option 1
PE/GND* option 2
Battery
fuse
Battery
fuse
Battery
fuse
BATTERY BANK 1
(main battery bank)
BATTERY
BANK 3
BATTERY
BANK 2
Temperature sensor
OPTIONAL
COMMON NEGATIVE (–)

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13
WARNING!
All electrical systems (AC and DC)
must be disconnected from any
power source during the entire
installation!
CAUTION!
Too-thin cables and/or loose
connections can cause dangerous
overheating of the cables and/or
terminals. Therefore, tighten all
connections well, in order to limit
transition resistance as far as
possible. Use cables of the correct
size.
CAUTION!
Short circuiting or reversing polarity
may lead to serious damage to the
batteries, the ChargeMaster Plus, the
cabling and/or the terminal
connections. Fuses between the
batteries and the ChargeMaster Plus
cannot prevent damage caused by
reversed polarity. The damage as a
result of reverse polarity is
detectable by the service depart-
ment and is not covered by the
warranty.
3.8 Installation step-by-step
1
2
3
Open the connection
compartment by loosening the two
screws.
4
Fix the enclosure to the wall by
fastening two screws at the lower side
of the ChargeMaster Plus as well.

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ChargeMaster Plus 12/35-3, 12/50-3, 24/20-3, 24/30-3 –User and Installation Manual
5
Connect the AC wiring to the spring-
clamp terminals:
1 Push a flat-blade screwdriver
(3mm / 1/8") into the square hole
to open the related wire port.
2 Insert the wire 15mm / 0.6" into
the opening.
3 Remove the screwdriver.
Fasten the cable with the strain relief.
6
Integrate a fuse holder in the positive
battery wire but do not place the fuse
yet!
Fit crimp-on cable lugs to the DC
cables. Connect the DC cabling of
battery bank 1, positive to +, negative
to –.
Tightening torque: 4.9 –5.4 Nm
[43 –47 In-lb]
Repeat steps for output 2 and 3.
7
Attach the battery temperature sensor
to the casing of battery bank 1.
Plug the temperature sensor cable
into the “Temp sense” jack.
Option: Connect the ChargeMaster to
the CZone or MasterBus network.
8
Adding to a CZone network
1 Disconnect the backbone at the
closest backbone connection and
add in a tee connector.
2 Reconnect the backbone
connection(s) with the new tee
connector in place.
3 Connect the RJ45 CZone/MB drop
cable to the black coupler on the tee
and then connect to the
ChargeMaster Plus. Plug the
connectors into either of the ports.
Adding to a MasterBus network
1 Disconnect a MasterBus cable or
Terminator from the closest
MasterBus device and connect it to
the ChargeMaster Plus.
2 Connect the new MasterBus cable to
the other MasterBus device and then
connect to the ChargeMaster Plus.
Ensure that the network is properly
terminated.

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15
3.9 Commissioning after installation
1 Check the wiring; positive connected to
positive (red cables), negative connected to
negative (black cables).
2 When all wiring is OK, place the DC fuse(s) to
connect the batteries to the ChargeMaster
Plus.
WARNING!
When placing this fuse, a spark
might occur, caused by the
capacitors used in the
ChargeMaster Plus. This is
particularly dangerous in
places with insufficient
ventilation. Due to the gassing
of the batteries, an explosion
can occur. Avoid having
flammable materials close by.
3 Switch on the AC power supply.
Note: when new, the ChargeMaster Plus will
not start charging batteries before activated
with the ON/OFF button. See step 6.
4 Check the DIP switches.
See chapter DIP switch settings on page 16.
5 Check and adjust the settings of the
ChargeMaster Plus with MasterAdjust
(MasterBus network) or with the CZone
Configuration Tool (CZone network).
See chapter SETTINGS on page 16.
6 When the settings meet the power system's
needs, press and hold the ON/OFF button for
3 seconds to switch the charger on and
initiate the charging process.
9
If required, use a small screwdriver to
change DIP switch settings. See
section 4.1.
10
Check all wiring; see also Figure 3
for wiring details. If all wiring is OK:
Place the DC fuses.
11
Close the connection compartment
by fixing the screws.
12
Continue with section 3.9 for
commissioning of the ChargeMaster
Plus.

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4SETTINGS
Adjustment of the settings of the ChargeMaster
Plus can be made in two different ways:
•By means of DIP switches.
•From a laptop or notebook connected to the
ChargeMaster Plus via a USB Interface. Some
settings can only be changed in this way.
CAUTION!
Invalid settings of the
ChargeMaster Plus can cause
serious damage to your batteries
and/or the connected load! Only
authorized personnel may adjust
settings.
When required, the ChargeMaster Plus can be
restored to factory settings (see section 4.2).
4.1 DIP switch settings
Use a small screwdriver to carefully set the
required settings.
Figure 4: DIP switches (factory settings)
In a CZone network:
Set DIP switches 1 and 2 to OFF.
DIP switches 3 to 10 must match the unique
address used in the CZone network; the
dipswitch. At least one of DIP switches 3 to 10
must be ON. See the CZone Configuration Tool
Instructions manual for more information.
In a MasterBus network:
Set DIP switch 1 to ON.
DIP switch 2 is MasterBus Powering ON (1) or OFF
(0).
DIP switches 3 to 5 are used for battery type
selection:
DIP switch
3
4
5
MasterBus settings (Flooded)1
0
0
0
Flooded (fixed settings)
0
0
1
AGM (fixed settings)
0
1
0
Gel (fixed settings)
0
1
1
Lithium-ion (fixed settings)
1
0
0
Constant voltage (13.25/26.50V)2
1
1
1
1If all DIP switches are in the OFF position (0 ), the
settings suit a Flooded battery but can be changed
in MasterAdjust.
2 Constant voltage has no temperature compensation
See section 5.4 for more information on charge
voltage settings and section 5.5 for DC OUT.
DIP switches 6 to 10 are not used in MasterBus.
4.2 MasterBus configuration
MasterBus is a CAN based data network for communication between Mastervolt devices. When the
ChargeMaster Plus is connected, open MasterAdjust on a Windows laptop or notebook connected to the
MasterBus network via a MasterBus USB interface. MasterAdjust software is available as free to download
software on the Mastervolt website: www.mastervolt.com. This tool runs on a Windows laptop or
notebook.
4.2.1 Monitoring
A remote panel, like the SmartRemote, Touch 5 (CZone) or EasyView 5 (MasterBus), can be used for
reading battery information. See applicable user manuals for details. The following table lists the
parameters as shown in MasterAdjust.
Parameter
Meaning
Value range
General
Device state
Shows charger state (On / Stand-by / Alarm / Off)
(read only)
Charger state
Actual state of charge process: Off/bulk/absorption/float/suspended
(read only)

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17
Parameter
Meaning
Value range
'Toggle' button
Button to toggle the charger state. This button does not work when
the ChargeMaster Plus is switched off manually. In that case it can
only be switched on with the ON/OFF button.
On / Standby
AC IN limit
Option to set the maximum AC input current level to prevent a
generator or shore fuse from overload. See section 4.2.6 for more
information. Default 20.
12/35-3: 0-9A
12/50-3: 0-11A
24/20-3: 0-10A
24/30-3: 0-15A
AC present 
Shows the presence of AC input
(read only)
Battery temp.
Temperature of the main battery bank (in °C)
(read only)
DC 1 OUT
Output 1
Output state
(read only)
Output 1 V
Voltage of charge output 1
(read only)
Output 1 A
Output current of charge output 1
(read only)
Batt/Shunt link
A connected MasterShunt can be chosen for feedback on the
charged battery. Default not selected.
(read only)
DC 2 OUT
Output 2
Output state
(read only)
Output 2 V
Voltage of charge output 2
(read only)
Output 2 A
Output current of charge output 2
(read only)
DC 3 OUT
Output 3
Output state
(read only)
Output 3 V
Voltage of charge output 3
(read only)
Output 3 A
Output current of charge output 3
(read only)
Parameters marked with a  are not available in CZone.
4.2.2 Alarms
The following table lists the available alarms in MasterAdjust.
Parameter
Meaning
Alarm status
Bat. temp. error
Battery temperature too high / too low
TS error
Temperature sensor error
AC error
AC input (mains) out of range
Dev. temp. high
ChargeMaster Plus temperature too high
DC 1/2/3 OUT
Shunt mismatch
Setting for nominal voltage (12/24V) at the MasterShunt or the nominal voltage of
the MLI batteries differs from nominal voltage detected by the ChargeMaster Plus.
Check battery voltage and settings of the MasterShunt or voltage of the MLI Ultra
battery.
Reverse polarity
DC + and DC –are connected in reverse (this will damage the charger)
4.2.3 History
The history data shows the absolute maximum readings. The following parameters are only shown in
MasterAdjust.
Parameter
Meaning
Days running
Total run time in charger mode
Total Ah’s
Total charged Ah’s

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4.2.4 Configuration settings
The configuration can be done in MasterAdjust, from a laptop or notebook connected to the
ChargeMaster Plus via a Mastervolt USB Interface. See applicable user manuals for details. The following
table lists the parameters as shown in MasterAdjust.
Notes: - DIP switch settings overrule MasterBus settings. If DIP switches are not in their default setting,
the corresponding MasterBus setting is grayed out.
- To be able to make changes to the configuration via MasterBus, DIP switch 1 must be in the
ON position.
Parameter
Meaning
Factory setting
Value range
Device
Language
Menu language of this device
English
EN, NL, DE, FR, ES, IT,
NO, SV, FI, DA
Name
Name of this device. This name will be
recognized by all devices connected to
the network
ChargeMaster
0-12 characters
Powersave
mode
If Powersave mode is ON, the charger
will switch itself off when no AC power
is available.
If Powersave mode is OFF, the charger
stays ON even when no AC power is
available.
On
On, Off
CZone
enabled
This checkbox is marked when the
ChargeMaster Plus is setup to work in a
CZone network
Off
(read only)
DIP Switches
DIP switch settings
11 00000000
(read only)
Charger
Method
Charge method
3-Step+
3-Step+, constant
voltage
DC current
limit
Maximum DC output current
Depending on
model, 100%
Depending on model
20-100%
Battery type
The battery type settings are based on
Mastervolt batteries. If connecting
batteries of a different manufacturer,
make sure the manufacturer's recom-
mendations are met. Should this not be
the case, then "User defined" must be
selected to change the settings.
Flooded
User defined, AGM,
Gel, Flooded, Lithium-
ion (MLI)
Temp.
compensate
Temperature depended charge voltage
compensation
-0,030V/°C /
-0,060V/°C
-1,000/+1,000V/°C
Bulk
Voltage
Bulk voltage (@ 25°C); see section 5.4
14.40/28.80V
8-16/16-32V
Minimum time
Minimum time of the Bulk phase since
Start bulk timer
120sec
0-240sec
Start time at
Battery voltage trigger point to start the
bulk timer
13.25/26.50V
(read only)
Maximum time
Maximum time of the Bulk phase since
Start bulk timer
480 min
0-1440min

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19
Parameter
Meaning
Factory setting
Value range
Absorption
Voltage
Absorption voltage (@ 25°C); see
section 5.4
14.25/28.50V
8-16/16-32V
Maximum time
Maximum absorption timer
240min
0-1440min
Return Amps
Return amps. If the charge current
drops below this level, the charger
switches from the Absorption to the
Float stage (% of Imax)
6%
0-50%
Minimum time
Minimum absorption timer
15min
0-240min
Float
Voltage
Float voltage (@ 25°C); see section 5.4
13.25/26.50V
8-16/16-32V
Return to bulk
V
Return to bulk voltage; If the battery
voltage stays below this level for at least
the Return to bulk delay time, the
charger will start the Bulk stage
12.80/25.60V
8-16/16-32V
Return to bulk
sec
Return to bulk delay time, see Return to
bulk voltage
30sec
0-240sec
DC 1 OUT
Name
Name of this output
Output 1
0-16 chars
Batt/Shunt link
Selection of the MasterShunt to which
output 1 of the ChargeMaster Plus is
connected
Not selected
Not selected,
MSH + Product Name,
BAT + Product Name
DC 2 / 3 OUT
Name
Name of this output
Output 2 / 3
0-16 chars
Installer menu
Factory settings
button
Button to reset the ChargeMaster Plus
to default settings (requires installer
rights)
Not applicable
Not applicable
Parameters marked with a  are not available in CZone.
4.2.5 Events –System automation
A CZone/MasterBus device can be programmed to initiate an action at another connected device. This is
very helpful in automation of your system but is not required.
In MasterBus this is done by means of event-based commands. In the Events tab you can program the
ChargeMaster Plus to act as an event source. Events which occur during the operation of the
ChargeMaster Plus will then trigger actions from other products. The following tables list the parameters
as shown in MasterAdjust.
Field
Meaning
Value
Event x source
Select an event that triggers an action, for
example Battery pre low.
See Event source list
Event x target
Select the device that should take action, for
example the generator
Selectable targets are
system dependent
Event x command
Select the parameter that must be changed on the
target device, for example Activate.
See command list of the
selected device
Event x data
Data, for example On, is linked to the command.
Off, On, Copy, Copy Invert,
Toggle
Table 1: MasterBus event parameters

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ChargeMaster Plus 12/35-3, 12/50-3, 24/20-3, 24/30-3 –User and Installation Manual
The ChargeMaster Plus can be configured as an event source. An event source can be used to initiate
an event command and an event action by another device.
Event source
Meaning
Charger state
State of the ChargeMaster Plus serves as an event source
Bulk
Bulk state of charge serves as an event source
Abs
Absorption state of charge serves as an event source
Float
Float state of charge serves as an event source
Failure
Any fault condition of the ChargeMaster Plus serves as an event source
Table 2: ChargeMaster Plus MasterBus Event sources
When the ChargeMaster Plus 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 ChargeMaster Plus.
Event command
Meaning
On
Command to switch on the ChargeMaster Plus
Bulk
Command to start the Bulk state of charge
Abs
Command to start the Absorption state of charge
Float
Command to start the Float state of charge
Suspend charging
When using an MLI Ultra Li-ion battery, this event is obligatory. Refer to the MLI
Ultra manual.
Table 3: ChargeMaster Plus MasterBus Event commands
4.2.6 Current control
If the available power at the AC input is limited. The ChargeMaster can be configured to reduce input
current. The Current Control level should be set equal to or lower than the value of the external circuit
breaker, which protects the incoming AC power. For example, when the external AC power is limited by
a 6A fuse, the Current Control level should be set to ≤6A. The AC input current of the ChargeMaster Plus
will be reduced to 6A.
How to set the AC input current in a MasterBus network
1. Open MasterAdjust.
2. Select the ChargeMaster Plus.
3. Go to the Monitoring tab.
4. In the Input Current field, enter the required value.
4.3 MasterShunt
In a MasterBus network, a MasterShunt can be coupled with output 1 (DC 1 OUT) of the ChargeMaster
Plus. The actual measurement data of the MasterShunt will be used to charge the batteries. Refer to the
manual of the MasterShunt for information on how to configure your system.
4.4 Lithium-ion Battery MLI Ultra
The ChargeMaster Plus can be combined with a Li-ion MLI Ultra battery. Refer to the manual of the MLI
Ultra for information on how to configure your system.
WARNING!
Before using the Li-ion battery, it must be properly installed and commissioned!
4.5 CZone configuration
The CZone®network is an NMEA 2000-compliant CAN-based system. When the ChargeMaster Plus is
connected, open the CZone Configuration Tool on a Windows laptop or notebook connected to the CZone
network. Either do the configuration while connected to the network or use a prepared configuration file
(.zcf). Ensure that a DIP Switch is assigned.