Mastervolt CHARGEMASTER 12/35-3 User manual

USERS MANUAL
CHARGEMASTER
12/35-3, 12/50-3, 24/20-3, 24/30-3
FULL AUTOMATIC BATTERY CHARGER

TABLE OF CONTENTS
2
TABLE OF CONTENTS: 10000008586/00 - February 2015
1GENERAL INFORMATION.............................................................................................................................................. 3
1.1Use of this manual.............................................................................................................................................. 3
1.2Validity of this manual ........................................................................................................................................ 3
1.3Use of pictograms .............................................................................................................................................. 3
1.4Identification label............................................................................................................................................... 3
1.5Liability ............................................................................................................................................................... 3
2OPERATION.................................................................................................................................................................... 4
2.1Features ............................................................................................................................................................. 4
2.2Switching on / stand-by ...................................................................................................................................... 4
2.3LED display ........................................................................................................................................................ 5
2.4Three Step charge algorithm .............................................................................................................................. 6
2.5Masterbus (optional)........................................................................................................................................... 7
2.6Maintenance....................................................................................................................................................... 7
2.7Failures............................................................................................................................................................... 7
3INSTALLATION............................................................................................................................................................... 8
3.1Unpacking .......................................................................................................................................................... 8
3.2Environment ....................................................................................................................................................... 8
3.3Wiring ................................................................................................................................................................. 8
3.4Batteries ............................................................................................................................................................. 9
3.5Things you need................................................................................................................................................. 9
3.6Overview connection compartment .................................................................................................................. 10
3.7Connection ....................................................................................................................................................... 10
3.8Installation step by step .................................................................................................................................... 12
3.9Commissioning after installation....................................................................................................................... 14
3.10Decommissioning ............................................................................................................................................. 14
3.11Storage and transportation ............................................................................................................................... 14
3.12Re-installation................................................................................................................................................... 14
4SETTINGS ..................................................................................................................................................................... 15
4.1DIP Switch settings .......................................................................................................................................... 15
4.2Equalize mode.................................................................................................................................................. 15
4.3MasterBus functions......................................................................................................................................... 16
5TROUBLE SHOOTING.................................................................................................................................................. 20
6TECHNICAL DATA........................................................................................................................................................ 21
6.1Specifications 12V models ............................................................................................................................... 21
6.2Specifications 24V models ............................................................................................................................... 22
6.3Dimensions....................................................................................................................................................... 23
7ORDERING INFORMATION.......................................................................................................................................... 24
7.1MasterBus installation components.................................................................................................................. 24
7.2Miscellaneous................................................................................................................................................... 24

GENERAL INFORMATION
3
1 GENERAL INFORMATION
1.1 USE OF THIS MANUAL
This manual serves as a guideline for the safe and
effective operation, maintenance and possible correction
of minor malfunctions of the ChargeMaster
It is therefore obligatory that every person who works on or
with the ChargeMaster must be completely familiar with
the contents of this manual and the Important Safety
Instructions, and that he/she carefully follows the
instructions contained herein.
Installation of, and work on the ChargeMaster may be
carried out only by qualified, authorised and trained
personnel, consistent with the locally applicable standards
and taking into consideration the Important Safety
Instructions.
Copyright © 2014 Mastervolt. All rights reserved.
Reproduction, transfer, distribution or storage of part or all
of the contents in this document in any form without the
prior written permission of Mastervolt is prohibited
1.2 VALIDITY OF THIS MANUAL
All of the specifications, provisions and instructions
contained in this manual apply solely to standard versions
of the ChargeMaster delivered by Mastervolt.
This manual is only valid for the following models with
apparatus version “H” and higher (see section 1.4):
Part number Model
44010350, 4401035x ChargeMaster 12/35-3
44010500, 4401050x ChargeMaster 12/50-3
44020200, 4402020x ChargeMaster 24/20-3
44020300, 4402030x ChargeMaster 24/30-3
x = OEM Customer specific number
These models are mentioned as “ChargeMaster” further in
this manual.
1.3 USE OF PICTOGRAMS
Safety instructions and warnings are marked in this
manual by the following pictograms:
WARNING
A WARNING refers to possible injury to the
user or significant material damage to the
charger if the user does not (carefully) follow
the procedures.
CAUTION!
Special data, restrictions and rules with regard
to preventing damage.
A procedure, circumstance, etc which
deserves extra attention.
1.4 IDENTIFICATION LABEL
Figure 1: Identification label
The identification label is located at the right-hand side of
the ChargeMaster (see Figure 1). Important technical
information required for service, maintenance & secondary
delivery of parts can be derived from the identification
label.
CAUTION!
Never remove the identification label.
1.5 LIABILITY
Mastervolt can accept no liability for:
consequential damage due to use of the
ChargeMaster;
possible errors in the manuals and the results thereof.
Serial number
E815H0001
Apparatus version “H”
Part number
Manufactured in PRC
Serial no: E815H0001
Part no : 44020300
model : ChargeMaster 24/30-3
Input :
Output : 28,50VDC - 30A
120/230V AC 50/60 Hz 8.5A/4.2A
Designed by
Mastervolt
IP 23

OPERATION
4
2 OPERATION
Figure 2: operation of the ChargeMaster
2.1 FEATURES
The Mastervolt ChargeMaster is a fully automatic battery
charger. This means that under normal circumstances it
may stay switched on with the AC power and batteries
connected. The ChargeMaster is suitable for charging the
following battery types: Flooded lead acid, AGM, Spiral,
Gel, Deep cycle batteries and Mastervolt Li-Ion batteries
(MLi). It has an auto-ranging input facility which makes it
feasible to operate on almost any AC power source in the
world. It operates on both 230V and 120V without
compromising the output current. The three-step Plus
charging method guarantees that the batteries are always
charged to 100%.
With an external AC source connected, the ChargeMaster
charger also serves the function of an AC to DC converter
to supply DC loads which are connected to the batteries.
WARNING
The MLi charging voltages on this charger fit
the Mastervolt Li-ion (MLi) batteries and do
not necessarily fit other Li-ion batteries!.
Always follow the instructions provided by the
battery manufacturer!
2.2 SWITCHING ON / STAND-BY
The ChargeMaster is activated by holding the POWER
switch pressed for approx. 5 seconds. The POWER switch
will illuminate green. The state of charge (which is stored
in the memory of the ChargeMaster) will be displayed. If
necessary and if AC power is available, the ChargeMaster
will start to charge the batteries.
Once switched on, the ChargeMaster
automatically resumes operation after it was
disconnected from an AC-source temporarily.
By pressing the POWER button again for approx. 5
seconds, the ChargeMaster will switch back to stand-by:
the ChargeMaster stops and the POWER switch
illuminates red.
WARNING
Switching the ChargeMaster to “stand-by”
does not cut off the connection to the batteries
or the AC-source. This means that voltages
are still available inside the apparatus.
POWER
See section 2.2.
Solid green = on,
Solid red = standby.
Blinking = fault condition, see
section 2.7.
INFO
Press INFO shortly to switch
display: Current (A), Voltage (V).
SOURCE
Press SOURCE to select the
battery bank (1, 2 or 3) you want to
monitor.

OPERATION
5
Figure 3: LED display
If the ChargeMaster was switched to stand-by or AC
power became unavailable, the POWER switch starts
blinking red. After approximately 2 minutes the blinking will
stop and the display will switch off, thus preventing the
ChargeMaster slowly draining the battery.
Only if DIP-switch #3 was adjusted to ON and
the charger was switched on, the indication
light stays blinking orange, indicating that the
AC-power supply fails in operation. Note that
this blinking LED may slowly drain your
batteries. See section 4.1.3.
The ChargeMaster can also be operated and
monitored remotely by means of a MasterBus
remote control panel. See section 4.3 for
details.
2.3 LED DISPLAY
The ChargeMaster is equipped with a multicolour LED
display. See Figure 3. Different LED colours and
combinations have different meanings. Combination of the
current display (A) with the load bar shows the percentage
of maximum current, of the three Battery banks together.
Combination of (V) with the load bar shows the actual
charging voltage.
If one of LEDs illuminates red, a fault condition is detected;
see section 2.7
Load bar
Yellow LED “A” = on Yellow LED “V” = on
Charge current Charge voltage
12V 24V
100% >14V >28V
80% 13-14V 26-28V
60% 12-13V 24-26V
40% 11-12V 22-24V
20%
10.5-11V,
Blinking:
10-10,5V
21-22V,
Blinking:
20-21V
Red LED: see section 2.7 Selected battery bank
(1, 2 or 3). Press
SOURCE to alter.
Highlighted if the ChargeMaster is
connected to the Masterbus network
Actual stage of the three step
charge algorithm.

OPERATION
6
2.4 THREE STEP CHARGE ALGORITHM
See Figure 4. Battery charging is accomplished in three
automatic stages: BULK, ABSORPTION and FLOAT.
The first step of the three step charge system is the BULK
phase, in which the output current of the charger is 100%,
and the greater part of the capacity of the battery is rapidly
charged. The current charges the batteries and gradually
the voltage rises to the BULK voltage 14.4V (MLi: 14.25V)
resp. 28.8V (MLi: 28.5V) at 25°C / 77°F.
The duration of this phase depends on the ratio of battery
to charger capacity, and the battery state of charge.
Figure 4: Three step charge system
The bulk phase is followed by the ABSORPTION phase.
Absorption charging starts when the voltage on the
batteries has reached the BULK voltage, and ends when
the battery is completely full. Battery voltage remains
constant at 14.25V / 28.5V at 25°C / 77°F throughout this
stage, and the charge current depends on the degree to
which the battery was initially discharged, the battery type,
the ambient temperature, and so on. With a flooded
battery this stage lasts approx. 4h, with gel and AGM
around 3h. Once the battery is 100% full, the
ChargeMaster automatically switches over to the float
phase. At FLOAT (for Gel/AGM, flooded batteries) the
ChargeMaster switches to a stabilised 13.25V (MLi: 13.5V)
or 26.5V (MLi: 27.0V) at 25°C / 77°F.
Connected DC-loads are powered directly by the charger.
If the load is higher than charger capacity, the required
additional power comes from the battery, which will be
progressively discharged until the charger automatically
switches back to the bulk phase. Once consumption
decreases, the charger goes back to normal operation of
the three-step charge system.
As the ChargeMaster is equipped with a three-step Plus
charge system, the batteries can also remain connected to
the ChargeMaster during winter. One hour every 12 days
the charger automatically switches to absorption to keep
the battery running properly and prolong its life span. The
three-step Plus charge system is also safe for all the
connected equipment.
See also APPENDIX for detailed characteristics
of the three step Plus charge system.
2.4.1 Temperature compensated charging
By installing the battery temperature sensor the charge
voltages are automatically adapted for deviating
temperatures.
Figure 5: Temperature compensated charging
See Figure 5. When the battery temperature is low, the
charge voltage increases. On the other hand, when the
battery temperature is high, the charge voltage is
decreased. Over charge and gassing are prevented this
way. This will extend the life of your batteries.
2.4.2 Connection of a second and third battery
The ChargeMaster is equipped with three equal outputs.
The total output current is divided over these three
outputs. See chapter 3 for connection.
CHARGE CURRENT
BATTERY VOLTAGE
BULK ABSORPTION FLOAT
TIME
12V 24V
battery temperature (°C)
charge voltage (V)

OPERATION
7
2.5 MASTERBUS (OPTIONAL)
The ChargeMaster is compatible with the MasterBus
network: a fully decentralized data network for
communication between the different Mastervolt system
devices such as the inverter, battery charger, generator,
batteries and many more. See APPENDIX for details.
2.6 MAINTENANCE
No specific maintenance to the ChargeMaster is required.
Examine your electrical installation on a regular base, at
least once a year. Defects such as loose connections,
burnt wiring etc. must be corrected immediately.
If necessary, use a soft clean cloth to clean enclosure of
the ChargeMaster. Do not use any liquids or corrosive
substances, such as solvents, alcohol, petrol or abrasive
components.
2.7 FAILURES
The ChargeMaster is protected against overload, short
circuit, over heating and under and over voltage. If a fault
condition occurs, a load bar segment on the display
illuminates red. The LED position indicates the failure
cause.
*At Battery low the battery bank number concerned is
blinking. Selecting another bank is still possible then, the
display will return after 5 seconds.
**The POWER button is blinking.
CAUTION!
The ChargeMaster is not protected against:
reversed polarity on the DC-output,
over voltage on the AC-input.
Red LED
Fault condition
Wrong AC voltage**
Charger failure**
Battery voltage too high**
Internal temperature too high**
Battery low, short circuit*.
Blinking: AC not available
Load bar

INSTALLATION
8
3 INSTALLATION
During installation and commissioning of the
ChargeMaster, the important safety instructions are
applicable at all times.
3.1 UNPACKING
In addition to the ChargeMaster the delivery includes:
Mounting bracket to mount the ChargeMaster to a wall;
Battery temperature sensor;
MasterBus terminating device (see APPENDIX);
This User’s manual
Important Safety Instructions
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 1.4)
whether the battery voltage is the same as the nominal
output voltage of the ChargeMaster (e.g. 24V battery set
for a 24V battery charger).
3.2 ENVIRONMENT
Obey the following stipulations during installation:
The ChargeMaster is designed for indoor use only.
Ambient operating temperature: -25°C ... 60°C / -13°F
… 140°F (power de-rating above 25°C / 77 °F to
decrease the internal temperature).
Humidity: 0-95% non condensing.
Mount the ChargeMaster preferably to a vertical wall,
with the connecting cables downwards.
Do not expose the ChargeMaster to excessive dust,
aggressive environments, ammonia or salt.
Make sure that the hot air that is developed during
operation can be discharged. The ChargeMaster must
be mounted in such a way that obstruction of the
airflow through the ventilation openings will be
prevented.
No objects must be located within a distance of 10 cm /
4 inch around the ChargeMaster.
Do not locate the ChargeMaster in the same
compartment as the batteries.
Do not install the ChargeMaster straight above the
batteries because of possible corrosive sulphur fumes.
If the ChargeMaster is installed in the immediate
vicinity of living areas, take into account that the fan of
the ChargeMaster can produce noise when operating.
Although the ChargeMaster fully complies with all
applicable EMC limits, it may still cause harmful
interference to radio communication equipment. If such
interference appears, it is recommended to increase
the separation between the ChargeMaster and the
equipment, to relocate the receiving antenna or to
connect the equipment to a circuit different from that to
which the ChargeMaster is connected.
3.3 WIRING
WARNING!
The wire and fuse sizes stated in this manual
are given as example only. Prescribed wire
and fuse sizes may be different due to local
applicable regulations and standards.
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 for output 1, 2 and 3 is:
Model
ChargeMaster DC Cable cross section:
<2m / 6ft 2-5m / 6ft
12/35-3 16mm² / 4AWG 25mm² / 2AWG
12/50-3 25mm² / 2AWG 35mm² / 1AWG
24/20-3 10mm² / 6AWG 16mm² / 4AWG
24/30-3 16mm² / 4AWG 25mm² / 2AWG
Use ring terminals on the ends of the wires. The terminals
must be crimped with a proper crimping tool. Use the
following wire colours for DC wiring colour or at least
different colours to make a clear distinction between the
positive and negative wire from the battery:
Wire colour Meaning Connect to:
Red Positive + (POS)
Black Negative – (NEG)

INSTALLATION
9
Lay 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 outputs 1, 2 and 3 are:
Model ChargeMaster DC fuse
12/35-3 40A
12/50-3 63A
24/20-3 32A
24/30-3 40A
The fuse with the fuse-holder is available from your local
Mastervolt distributor or Customer Service Representative.
3.3.2 AC wiring
The AC cable and is pre-assembled to the ChargeMaster.
The following wiring colours apply:
Wire color Meaning Connect to:
Brown Hot/Line/ Phase L1
Blue Neutral N
Green/Yellow PE / Ground PE / GND
3.3.3 AC safety grounding
WARNING!
The ground wire offers protection only if the
enclosure of the ChargeMaster is connected
to the safety ground. Connect the ground
terminal (PE / GND) to the hull or the chassis.
CAUTION!
For safe installation it is necessary to insert a
Residual Current Device (earth leakage
switch) in the AC input circuit of the
ChargeMaster.
3.4 BATTERIES
Always follow the instructions published by battery
manufacturer. The minimum required battery capacity for
Mastervolt gel batteries (MVG series) is as follows:
Model
ChargeMaster Minimum required battery capacity (MVG series)
12/35-3 85Ah
12/50-3 120Ah
24/20-3 55Ah
24/30-3 85Ah
See section 4.1.4 for minimum required
battery capacity to meet the requirements of
the CEC regulations (USA only).
3.5 THINGS YOU NEED
Make sure you have all the parts you need to install the
ChargeMaster:
ChargeMaster (included);
Battery temperature sensor with cable and plug
(included);
DC cables to connect the ChargeMaster to the DC-
distribution; 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 4.5mm) (with plugs) to mount the
enclosure to a surface. Use mounting materials which
are suitable to carry the weight of the ChargeMaster;
Batteries; see section 3.4;
Appropriate and reliable cable terminals, cable lugs,
battery terminals and cord end terminals.
We recommend as a minimum tool kit:
Socket wrench 10mm to fix the DC-cables;
Tools to fix the screws / bolts (Ø 4.5mm) with plugs to
mount the enclosure to a surface;
Philips screw driver nr. 2 to open the connection
compartment and to fix the Safety ground connection;
A small screw driver for adjustment of the DIP-
switches.

INSTALLATION
10
3.6 OVERVIEW CONNECTION COMPARTMENT
1. Cable gland for AC-wiring
2. Isolation caps for DC connections
3. Positive terminal charge output 1
4. Common negative output terminal
5. Safety ground connection
6. Positive terminal charge output 2
7. Positive terminal charge output 3
8. MasterBus connectors
9. Temperature sensor jack
10. DIP switches
Figure 6: Overview connection compartment
3.7 CONNECTION
3.7.1 General
WARNING
Let installation work be done by a licensed
electrician.
All electrical systems (AC and DC) must be
disconnected from any power source during
the entire installation!
CAUTION!
Short circuiting or reversing polarity may lead
to serious damage to the batteries, the
ChargeMaster, the cabling and/or the terminal
connections. Fuses between the batteries and
the ChargeMaster can not prevent damage
caused by reversed polarity. The damage as
a result of reverse polarity is detectable by the
service department and is not covered by the
warranty.
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.
NOTE:
If the battery temperature remains within 15-
25°C, connection of the battery temperature
sensor is optional.
NOTE:
The ChargeMaster is only feasible for the
connection of MasterBus compatible remote
control panels.
1
23 4 6 7 2
5
10
9
8

INSTALLATION
11
3.7.2 Connection example
This schematic is to illustrate the general placement of the ChargeMaster in a circuit. It is not meant to provide detailed wiring
instructions for any particular electrical installation.
Figure 7: Connection example of the ChargeMaster
AC Input
RCD
Temperature
sensor
BATTERY
BANK 1
BATTERY
BANK 2
BATTERY
BANK 3
DC fuse
Battery
fuse Battery
fuse
Battery
fuse

INSTALLATION
12
3.8 INSTALLATION STEP BY STEP
6 Option: Connect the DC-wiring of the second
and third battery bank. These battery banks
should have a common negative with the
main battery (see Figure 7).
5 Remove the isolation cap from the DC
terminals. Fit crimp-on ring terminals to both
DC-cables. Connect the DC-cabling of
battery bank 1, positive to +, negative to – .
4 Fix the enclosure to the wall by fastening two
screws at the lower side of the enclosure as
well.
3 Open the connection compartment by
loosening the two screws.
2 Place the ChargeMaster over the mounting
bracket and then move it downwards until it is
suspended from the mounting bracket.
1 Mark the position of the four mounting spots
by using the mounting bracket. Then fix the
mounting bracket to the wall.

INSTALLATION
13
13 Connect the AC wiring. See section 3.3.2.
9 Option: Connect the ChargeMaster to the
MasterBus network. See APPENDIX.
7 Mount the isolation caps of the
DC terminals back into position
Mind the + and – markings!
14 Continue with section 3.9 for commissioning
of the ChargeMaster.
11 Check all wiring; see also Figure 7 for wiring
details.
12 Close the connection compartment by fixing
the two screws.
If required, change DIP-settings. See section
4.1 for adjustment.
Use a small screw driver for adjustment of
the DIP-switches.
10
8 Attach the battery temperature sensor to the
casing of battery bank 1.
Plug the temperature sensor cable into the
“temp.sensor” jack.

INSTALLATION
14
3.9 COMMISSIONING AFTER INSTALLATION
3.9.1 General
If your ChargeMaster is not new, you have to
take into account that former users may have
changed the settings. Reset the
ChargeMaster to Factory Settings when there
is any doubt (see section 4.3.4).
The factory settings of the ChargeMaster are optimal for
most installations. With some applications however, it is
desirable to change these settings. Therefore several
adjustments can be made. See chapter 4.
NOTE:
The DIP-switches must be adjusted prior to
commissioning; all other settings can only be
made after commissioning.
3.9.2 Commissioning step-by-step
CAUTION!
Check the polarity of all wiring before
commissioning: positive connected to positive
(red cables), negative connected to negative
(black cables).
1 If all wiring is OK, place the DC-fuse(s) of the DC-
distribution to connect the batteries to the
ChargeMaster.
WARNING
When placing this fuse, a spark can occur,
caused by the capacitors used in the
ChargeMaster. 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.
2 Switch on the AC power supply
3 Hold the POWER button (Figure 2) pressed for 5
seconds to switch on the charger
Now the ChargeMaster will initiate the charging process.
3.9.3 MasterBus (optional)
During first commissioning the ChargeMaster will be
recognized by the MasterBus network automatically. The
remote control panel of the MasterBus network will
indicate that a new device was found.
Some settings can only be changed via the MasterBus
interface. See section 4.3 for an overview of all available
MasterBus settings. Refer to the user’s manual of the
remote control panel to change these settings.
3.10 DECOMMISSIONING
To put the ChargeMaster out of operation, follow these
instructions in order of succession:
1 Switch the ChargeMaster to stand-by (see section
2.2).
2 Remove the DC-fuse(s) and disconnect the batteries.
3 Remove the AC-fuse(s) of the AC-input and/or
disconnect the AC-mains.
4 Open the connection compartment of the
ChargeMaster.
5 Check with a suitable voltage meter whether the
inputs and the outputs of the ChargeMaster are
voltage free.
6 Disconnect all the wiring.
Now the ChargeMaster can be demounted in a safe way.
3.11 STORAGE AND TRANSPORTATION
When not installed, store the ChargeMaster in the original
packing, in a dry and dust free environment.
Always use the original packing for transportation. Contact
your local Mastervolt Service Centre for further details if
you want to return the apparatus for repair.
3.12 RE-INSTALLATION
To reinstall the ChargeMaster, follow the instructions as
described in this chapter (chapter 3).

SETTINGS
15
4 SETTINGS
Adjustment of the settings of the ChargeMaster can be
made in two different ways:
By means of DIP-switches; see section 4.1;
Via the MasterBus network; see section 4.3.
CAUTION!
Invalid settings of the ChargeMaster can
cause serious damage to your batteries
and/or the connected load! Adjustments of
settings may be undertaken by authorised
personnel only.
4.1 DIP SWITCH SETTINGS
The ChargeMaster has four DIP switches at the bottom
side of the enclosure. See Figure 8.
Figure 8: DIP switches
4.1.1 DIP switch 1: Battery type
The factory default for the battery type is optimal for most
installations. In some applications however, it is desirable
to change this setting.
Flooded battery (factory setting) OFF
Gel / AGM / spiral battery (see specifications) ON
4.1.2 DIP switch 2: Charge algorithm
IUoUo, fully automatic / 3step+ (factory setting) OFF
Constant voltage charging (Float = 13.25/26.5V) ON
4.1.3 DIP-switch 3: Stand-by mode for display
Display will switch off when ChargeMaster is
switched to stand-by mode (factory setting)
OFF
Display will stay on when ChargeMaster is
switched to stand-by mode. Note that the display
is powered by the batteries.
ON
4.1.4 DIP switch 4: CEC Energy saving mode
Energy saving mode disabled (factory setting) OFF
Energy saving mode enabled. ON
The CEC Energy saving mode is only
available on battery chargers that have the
BC logo on the Identification label (see
section 1.4)
The CEC Energy saving mode is used to meet the
requirements of the California Energy Commission (CEC).
When enabled, the charger switches to stand-by after
finishing the Absorption phase of the three-step charge
algorithm. This mode is applicable for battery charging
systems in the USA only.
Minimum battery capacity to meet the requirements of the
CEC regulations:
Model ChargeMaster Battery capacity
12/35-3 >400Ah
12/50-3 >560Ah
24/20-3 >240Ah
24/30-3 >320Ah
4.2 EQUALIZE MODE
WARNING
Incorrect use of the equalize mode may lead
to hazardous situations.
Do not smoke; use any naked flame or other
sources of ignition due to risk of explosion.
Always ventilate the room were the batteries
are located and equalized to clear the air.
Equalization is ONLY applicable for flooded
type batteries and will damage gel, AGM and
MLi type batteries.
An equalizing charge can be necessary after very deep
discharges and/or inadequate charges. This has to be
carried out according to the specifications of the
manufacturer of the batteries.
During equalizing the batteries are brought into the gas
state and it is possible that the permitted load voltages are
exceeded. Therefore appropriate measures must be
taken, e.g. disconnect all loads from the battery and
ventilate the room. For these reasons use of the equalizing
mode should only be executed by trained technical
engineers.
Off
On
BC

SETTINGS
16
The equalizing mode can only be started when the
ChargeMaster is in operation and in Float mode. The
equalize mode can only be started by means of MasterBus
(see section 4.3.4).
4.3 MASTERBUS FUNCTIONS
Adjustment of the settings of the ChargeMaster can be
made via the MasterBus network (by means of a remote
control panel or an interface connected to a PC with
MasterAdjust software).
See APPENDIX for more information about
MasterBus.
4.3.1 Monitoring
Value Meaning Factory setting Adjustable range
General
State Shows charger state (Charging / Standby / Alarm) (read only)
On/Stand-by Button to toggle the charger state On / Stand-by
Input current Option to set the maximum AC input current to prevent a
generator or shore fuse from overload situations
8.0A 0.0 – 8.0A
Charge State Actual state of charge algorithm: Bulk/absorption/float (read only)
Battery temp. Actual temperature of the main battery bank (in °C) (read only)
Output
Charge current Total output current of charge outputs 1, 2 and 3 (read only)
Output 1 Voltage of charge output 1 (read only)
Output 2 Voltage of charge output 2 (read only)
Output 3 Voltage of charge output 3 (read only)
4.3.2 Alarm
Value Meaning Factory setting Adjustable range
Charger
Temp sense error Battery temperature sensor is in short circuit (read only)
Temp error Battery temperature is out of range
<-20°C (-4°F) or >55°C (131°F)
(read only)
Output high DC output voltage is too high (read only)
Output low DC output voltage is too low (read only)
MSH out of range DC output voltage of the ChargeMaster differs more than
3.0V from the voltage measured by the Mastershunt
(read only)
4.3.3 History
This menu shows the absolute maximum readings.
Value Meaning Factory setting Adjustable range
Charger
Ah charged Total Ampere hours charged (Ah) (read only)
Total run time Total run time in charger mode (hours) (read only)
Temp. Shutdown. Number of temperature shutdowns (read only)
Low DC Shutdown Number of low DC voltage shutdowns (read only)
High DC Shutdown Number of high DC voltage shutdowns (read only)
Battery 1
Lowest DC volt Lowest detected DC voltage output 1 (read only)
Highest DC Volt Highest detected DC voltage output 1 (read only)
Battery 2

SETTINGS
17
Value Meaning Factory setting Adjustable range
Lowest DC volt Lowest detected DC voltage output 2 (read only)
Highest DC Volt Highest detected DC voltage output 2 (read only)
Battery 3
Lowest DC volt Lowest detected DC voltage output 3 (read only)
Highest DC Volt Highest detected DC voltage output 3 (read only)
4.3.4 Configuration
Below parameters can be changed via the MasterBus network by means of a remote control panel or by means of an interface
connected to a PC with MasterAdjust software. See applicable user’s manuals for details.
Value Meaning Factory setting Adjustable. range
General
Language Language that is displayed on a monitoring device
connected to the MasterBus
English EN, NL, DE, FR, ES,
IT, NO, SV, FI, DA
Product Name Name of this device. This name will be recognized by all
devices connected to the MasterBus
CHG CM+type* 0-12 chars
Output 1 Name of the battery bank connected to charge output 1 Output 1 0-16 chars
Output 2 Name of the battery bank connected to charge output 2 Output 2 0-16 chars
Output 3 Name of the battery bank connected to charge output 3 Output 3 0-16 chars
Factory Settings Reset to factory settings (button)
Charge current
Max. current Setting of the maximum output current Ima
x
1A - Ima
x
Battery type
Battery type Selection of pre-set charge algorithm.
Individual adjustments of Bulk, Absorption and Float are
only possible if “User defined” is selected here.
Flooded Flooded, AGM, Gel,
MLI, Flooded traction,
User defined
Mastershunt
Mastershunt A connected MasterShunt can be chosen for feedback
on the charged battery.
No connection No connection,
MSH + Product Name
Bulk
Bulk voltage Bulk voltage (@ 25°C); see section 2.4 14.40/28.80V 0-15.50/0-31.00V
Max. bulk timer Maximum time of the Bulk phase since Start bulk timer 480 min 0-1440min
Min bulk timer Minimum time of the Bulk phase since Start bulk timer 120sec 0-240sec
Start bulk timer Battery voltage trigger point to start the bulk timer 13.25/26.50V (read only)
Absorption
Abs. voltage Absorption voltage (@ 25°C); see section 2.4 14.25/28.50V 0-15.50/0-31.00V
Max absorp. time Maximum absorption timer 240min 0-1440min
Min absorp. time Minimum absorption timer 15min 0-240min
Return amps Return amps. If the charge current drops below this
level, the charger switches from the Absorption to the
Float stage (% of Ima
x
)
6% 0-50%
Float
Float voltage Float voltage (@ 25°C); see section 2.4 13.25/26.50V 0-15.50/0-31.00V
Constant voltage Charge voltage (@ 25°C) if the charger is set to the
Constant voltage charging (2-Step) mode; see section
4.1
13.80/27.60V 0-15.50/0-31.00V
Return to bulk 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 0-15.50/0-31.00V
Return to bulk Return to bulk delay time, see Return to bulk voltage 30sec 0-240sec
Alarms
DC High on Upper threshold level to trigger the Output high alarm 16.00/32.00V 0-16.00/0-32.00V

SETTINGS
18
Value Meaning Factory setting Adjustable. range
DC High off Lower threshold level to stop the Output high alarm 15.50/31.00V 0-16.00/0-32.00V
DC Low on Lower threshold level to trigger the Output low alarm 10.00/20.00V 0-16.00/0-32.00V
DC Low off Upper threshold level to stop the Output low alarm 11.00/22.00V 0-16.00/0-32.00V
Alarm Delay Delay time to trigger the Output low alarm 30sec 0-240sec
Equalization
Equalize voltage Voltage compensation for Equalize charging +2.25/+4.50V 0 - +2.25/+4.50V
Max equalize tim Max equalize timer 240min 0-1440min
Equalize mode Shows whether the Equalize mode is active (“On”) or not
(“Off”)
(read only)
Equalize Button to start the equalize mode manually See section
4.2. The equalize mode can only be started when the
charger is in the Float stage.
Button
Dip switches
Battery type Readout of DIP switch 1 (see section 4.1) Flooded (read only)
Charge algorithm Readout of DIP switch 2 (see section 4.1) 3step (read only)
Display mode Readout of DIP switch 3 (see section 4.1) Off (read only)
* Depending on model CM12/35, CM12/50, CM24/20, CM24/30
4.3.5 Events
Figure 12 shows the meaning of the event data.
Input (pulses)
The input is represented by an on/off switch.
Output (data)
On changes the status to On at the first signal.
Off changes the status to Off at the first signal.
Copy lets the status follow the input.
Copy Invert lets the status follow the opposite of the input
Copy is used for dimming too by holding the pulse switch
pressed for a longer time.
Toggle changes the status at the first signal and back at
the second signal. It is used in combination with a pulse
switch.
Figure 12: Event data

SETTINGS
19
Value Meaning Factory setting Adjustable. range
Events
Event x source Event-based command
Event by the ChargeMaster that should result in an
action by another device on the MasterBus network.
Disabled (See List of event
sources, section
4.3.6)
Event x target Event-based command
Selection of device on the MasterBus network that
should take action due to an event by the ChargeMaster.
(See Device list)
Event x command Event-based command
Action to be taken by the selected device.
(See List of event
commands in the
manual of the
selected device,)
Event x data Event-based command
Value of the action to be taken by the selected device.
(See List of event
commands in the
manual of the
selected device,)
Event x+1 The next event appears after enabling Event x. Disabled See Event x.
4.3.6 List of list of events sources (ChargeMaster as event source)
Below the list of event sources of the ChargeMaster is shown. These event sources can be used to initiate an event command
and an event action at another device that is connected to the MasterBus.
Event source Description
Not used (no event programmed)
On ChargeMaster state is On
Bulk State of charge is Bulk
Absorption State of charge is Absorption
Float State of charge is Float
Failure Charger failure MasterBus alarm
LED 1 Bottom yellow LED of the MasterView Read Out illuminates (see manual MasterView Read Out)
LED 2 2nd yellow LED from bottom of the MasterView Read Out illuminates (see manual MasterView Read Out)
LED 3 3rd yellow LED from bottom of the MasterView Read Out illuminates (see manual MasterView Read Out)
LED 4 4th yellow LED from bottom of the MasterView Read Out illuminates (see manual MasterView Read Out)
LED 5 Top yellow LED of the MasterView Read Out illuminates (see manual MasterView Read Out)
Fan Fan of the charger is on
4.3.7 List of list of event commands (ChargeMaster as event target)
Below the list of event commands and event data of the ChargeMaster is shown. Other devices connected to the MasterBus
can be programmed to initiate these commands and actions at the ChargeMaster.
Event command Description
State Command to switch on the ChargeMaster
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

TROUBLE SHOOTING
20
5 TROUBLE SHOOTING
If you cannot solve a problem with the aid of this chapter, contact your local Mastervolt Service Centre.
Make sure you have the following information present if you have to contact your local Mastervolt Service Center to
solve a problem:
Article and serial number; see section 1.4
Firmware version; double click on ChargeMaster icon in MasterView System software Configuration.
Malfunction Possible cause What to do
No output voltage
and/or current
No AC-input Check AC wiring, check remote control panel.
AC-input voltage too low (< 90VAC) Check input voltage, check generator.
AC input frequency out of range Check input voltage, check generator.
Output voltage too low,
charger supplies
maximum current
Load that is connected to the batteries is
larger than charger can supply.
Reduce load taken from the batteries.
Batteries not 100% charged Measure battery voltage. After some time this will
be higher.
Wrong setting of the charge voltage Check settings (see chapter 4).
Charge current too low Batteries almost fully charged Nothing, this is normal when the battery is almost
fully charged.
High ambient temperature Nothing; if ambient temperature is more than the
setting limit the charge current is automatically
reduced.
Low AC input voltage. At lower AC input
voltages the charge current is reduced.
See APPENDIX .
Check AC-input voltage.
Batteries not fully
charged
Charge current too low See “Charge current too low” in this table.
Current to load is too high Reduce load taken from the batteries.
Charge time too short Use a battery charger with higher capacity.
Battery temperature too low Use the battery temperature sensor.
Defective or old battery Check battery and replace if necessary.
Wrong setting of the charge voltage Check settings (see chapter 4).
Batteries are
discharged too fast
Battery capacity reduced due to wastage or
sulphation, stagnation
Charge and recharge a few times, this might help.
Check battery and replace if necessary.
Batteries are too warm,
gassing
Defective battery (short circuit in cell) Check battery and replace if necessary.
Battery temperature too high Use the battery temperature sensor.
Charge voltage too high Check settings (see chapter 4).
No MasterView display
function.
Display is switched off. Switch on display, refer to display manual.
Error in the wiring. Check the MasterBus cables.
Slow or no MasterBus
communication.
Error in the MasterBus wiring. Check the MasterBus cables.
No terminating device placed at the ends of
the network.
MasterBus needs a terminating device on both
ends of the network. Check if connected.
MasterBus network is configured as a ring
network.
Ring networks are not allowed. Check the
connections of the network.