Mastervolt AC Master 12/2500-230 Operating manual

AC Master
PURE SINE WAVE INVERTER
12/2500-230, 24/2500-230, 12/3500-230
EN USER’S AND INSTALLATION MANUAL
10000011809/00

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AC Master
Product description
The AC Master is a sine wave inverter. The AC Master converts DC energy from the battery into AC
output power. The AC Master 2500-3500 is equipped with an AC transfer switch and is suitable for
creating systems with multiple units in parallel or 3 phase configuration.

AC Master
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Front panel
1 Remote port (RS-232)
2 Terminal for remote switch and CAN termination
3 CAN1 port *
4 CAN2 port *
5 AC input circuit breaker 20 Amp
6 By-pass AC input
7 AC output
8 Chassis ground terminal
9 AC output socket
10 Battery input +
11 Battery input -
12 LCM port for LCD remote control panel **
13 DIP switches
14 LED indicator
15 Main switch
16 Hard-wire connection for AC output and AC input
17 Internal grounding cable (GND)
18 Internal grounding cable (Inverter Neutral)
* This is not a MasterBus port. Do not connect a CAN port to a MasterBus network. This will cause
hardware damage.
** LCM is not supported by Mastervolt

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AC Master
Dimensions
Model
A (mm) B (mm) C (mm) D (mm) E (mm) F (mm) G (mm) H (mm)
2500 436,0 240,0 95,6 268,6 8,5 11,5 128,0 283,0
3500 496,0 240,0 125,6 268,6 8,5 11,5 128,0 283,0

AC Master
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Identification label

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AC Master
Installation instructions
This section provides a step by step instruction of the basic stand-alone installation of
the AC Master 2500/3500. Please read the entire manual for instructions on safety,
grounding, configuration settings, additional features and creating systems with multiple
units.
Read the safety instructions! See section 1 on page 11.
Use isolated tools!
1. Disconnect power supplies
2. Switch OFF the AC Master
3. Select a location that complies with section 6 on page 12.

AC Master
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4. Mount the AC Master with four screws to a solid surface.
5. Connect the chassis ground terminal to the central grounding point of the vehicle/ship.
6. Optional: Connect remote panel or remote switch, see section 6 on page 12.

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AC Master
7. Connect the battery to the DC input.
8. Integrate a fuse holder in the positive battery wire, but do not place the fuse yet.

AC Master
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9. Connect the AC load. See section 5 on page 12 for instructions on neutral
grounding.
AC socket
AC hard-wired

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AC Master
10. Optional: Connect AC input, see section 7 on page 16.
11. Set the desired output voltage and other configuration settings, see section 8 on page 16.
12. Check all wiring. If all wiring is OK: Place the inverter fuse.
13. Switch ON the AC Master. In case of remote operation choose REMOTE.

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1. Safety instructions
WARNING!
Read the entire manual before using the AC Master. Keep the manual at a safe location for
future reference.
• Use the AC Master following the instructions and specifications stated in this manual.
• Connections and safety features must be executed according to the locally applicable
regulations.
• Operation of the AC Master without proper grounding may lead to hazardous situations!
• Use DC-cables with an appropriate size, see recommended wire sizes DC in section 6.
• Integrate an appropriate fuse in the positive wiring and place it nearby the battery, see technical
specifications table on page 26.
• If the positive and negative wires on the DC-input (battery) are exchanged, the AC Master will
be damaged. Damage of this kind is not covered by guarantee. Check whether all connections
are connected correctly before placing the fuse.
• Do not connect the AC-output of the AC Master to an incoming AC source.
• Never open the housing as high voltages may be present inside!
2. Liability
Mastervolt cannot be held liable for:
• Consequential damage resulting from the use of the AC Master.
• Possible errors in the included manual and the consequences of these.
• Use that is inconsistent with the purpose of the product.
3. Warranty
Mastervolt assures the product warranty of the AC Master during two years after purchase, on the
condition that the product is installed and used according to the instructions in this manual.
Installation or use not according to 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 for labour or shipping are not covered by this warranty.
4. Correct disposal of this product
(Waste Electrical & Electronic Equipment)
This product is designed and manufactured with high quality materials and
components, which can be recycled and reused. When this crossed-out wheeled bin
symbol is attached to a product, it means the product is covered by the European
Directive 2012/19/EU.
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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5. Neutral grounding
For neutral grounding you need to connect the internal ground cables:
Open the front panel and connect the neutral conductor of the AC
output (labelled ‘Inverter Neutral’) to the safety ground (labelled
‘GND’), see picture. Integrate a ground fault circuit-interrupter (GFCI)
in the wiring of the AC output.
The neutral grounding is only applicable when the unit is in Inverter
mode, see section 7.
For neutral grounding of systems with multiple units, see section 10.
Furthermore:
• The chassis ground terminal must be connected to the central
grounding point of the vehicle/ ship.
• Refer to locally applicable regulations regarding grounding of
autonomous power systems.
6. Installation
The basic installation of a stand-alone unit is described step-by-step at the beginning of this manual.
The location requirements, the recommended wire sizes, the optional remote panel and the remote
switch are described in the following sections.
Choosing a location to install
• Install the AC Master in a well-ventilated room protected against rain, snow, spray, vapour, bilge,
moisture and dust.
• Ambient temperature: –25 ... 40 °C / –13…104 °F.
• Never use the AC Master at a location where there is danger of gas or dust explosions.
• Mount the AC Master in such a way that obstruction of the airflow through the ventilation
openings is prevented. No objects must be located within a distance of 10 cm / 4 inch around
the AC Master.
• Do not install the AC Master in the same compartment as the batteries. Do not mount the AC
Master straight above the batteries because of possible corrosive sulphur fumes.
Recommended wire sizes DC
Model Minimum cross section
12/2500 95 mm2
24/2500 50 mm2
12/3500 120 mm2
Recommended wire sizes AC
Model Minimum cross section
output
Minimum cross section
input
2500 2,50 mm24,00 mm2
3500 4,00 mm24,00 mm2

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Remote panel (optional)
Optionally the remote panel is connected to the remote port (RS-232). Before using the remote
panel, make sure the main switch is at “REMOTE” position before startup.
Terminal for remote switch and CAN termination
This terminal offers two functions:
• Remote switch
Install a switch for remote operation. Make sure the main switch is at “REMOTE” position.
• Jumper for CAN termination
By connecting the jumper slots the CAN port communication line is terminated. This is
necessary in a system with multiple units, see section 10.
Remote switch
1 Ground (GND)
(same polarity with negative battery input)
2 Enable

(ENB)
3 Enable

(ENB)
Jumper for CAN termination
4 Jumper slot
5 Jumper slot

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7. AC input mode
In AC input mode the inverter switches from the default Inverter mode to Bypass mode when an
approved mains power supply is detected at the AC input. In Bypass mode the mains are directly
connected to the load, saving battery power. The AC input is available on the hard-wire terminal
behind the front panel.
The inverter continuously checks if a mains power supply is available and meets the voltage and
frequency requirements as set with the DIP switches. The AC input is equipped with a 20 Amp
circuit breaker.
The AC input mode is configured with DIP switch 2, see section 8.
Inverter mode

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Bypass mode

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8. Configuration
Always switch OFF all DC and AC power sources to activate new dipswitch settings.
DIP switch functions
1 AC output voltage setting
2 AC input mode
3 AC output frequency setting
4 Power saving or Master/Slave setting
5 Power saving or Master/Slave setting
6 Power saving or Master/Slave setting
7 Power saving mode or Master/Slave mode
8 LCM remote or DIP switch control
AC output voltage setting
Output voltage DIP switch 1
230 V 0
240 V 1
AC input mode
Mode Inverter- to Bypass mode
when AC input is in the
range of:
Bypass- to Inverter mode
when AC input is out of
range of:
DIP switch 2
0 230V* +/-12% 230V* +12%, -25% 0
1
(Sensitive loads)
230V* +/-12%
and
47~57Hz (53~63Hz)**
230V* +12%, -25%
or
46~58Hz (52~64Hz)**
1
* AC output voltage setting
** AC output frequency setting is 60Hz
AC output frequency setting
Frequency DIP switch 3
50 Hz 0
60 Hz 1

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Power Saving mode or Master/Slave mode select
Mode DIP switch 7
Power Saving Mode ON 0
Master/Slave mode ON
(in a system with multiple units)
1
Power Saving setting
The Power Saving mode saves energy from the battery in no load operation. The inverter scans the
output and compares the detected load to the set threshold value. When a load is detected which is
lower than the Power Saving threshold value, the inverter switches into Power Saving Mode. When
a load is detected which is approximately 2~3 times the threshold value, the inverter is switched
back on. Power Saving is not available when the inverter is in Master/Slave mode (DIP switch 7 =
1).
The Power Saving threshold value is set with DIP switch 4, 5 and 6. Make sure that Power Saving
Mode is selected (DIP switch 7 = 0).
Power Saving setting
Model Threshold
value
DIP switch 4 DIP switch 5 DIP switch 6 DIP switch 7
2500/3500 Power saving
disabled 0 0 0 0
2500
3500
50 W
70 W 1 0 0 0
2500
3500
75 W
105 W 0 1 0 0
2500
3500
100 W
140 w 1 1 0 0
2500
3500
125 W
175 w 0 0 1 0
2500
3500
150 W
210 w 1 0 1 0
2500
3500
175 W
245 w 0 1 1 0
2500
3500
200 W
280 w 1 1 1 0
Master/Slave mode setting
Master/Slave mode is only applicable when the unit is used in a system with multiple units for
parallel configuration or 3 phase configuration. Make sure that Master/Slave mode is selected (DIP
switch 7 = 0).

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Parallel configuration
DIP switch 4 DIP switch 5 DIP switch 6 DIP switch 7
Master 0 0 0 1
Slave 0 0 1 1
3 phase configuration
DIP switch 4 DIP switch 5 DIP switch 6 DIP switch 7
Master (0°) 0 0 0 1
Slave (-120°) 1 0 0 1
Slave (120°) 1 0 1 1
LCM remote or DIP switch control select
DIP switch 8
LCM remote control ON 0
DIP switch control ON 1

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9. Operation
LED indicator
LED color LED indication Meaning What to do?
Green
Solid
Power OK Normal operation
Green
Slow blinking
Power
Saving Mode
Normal operation
Green
Intermittent blinking
Bypass Normal operation
Orange
Fast blinking
Warning: DC-
input voltage
too high
Check battery voltage and switch off
charger.
Orange
Slow blinking
Warning: DC-
input voltage
too low
Check if DC input voltage is too low
because of voltage drop across the
DC cables due to too long or too
narrow cables. Reduce the length of
the DC cables or use cables with a
larger gauge.
Loose or corroded connections:
Tighten the connections; burnt cables
must be corrected immediately.
Flat battery: Disconnect the load and
recharge the battery.
Red
Intermittent blinking
Shutdown:
Internal
temperature
too high
Check the airflow through the
inverter. The operation of the cooling
fan may not be blocked.
Red
Fast blinking
Shutdown:
DC-input
voltage too
high
Check battery voltage and switch off
charger.
Red
Slow blinking
Shutdown:
DC-input
voltage too
low
Check if DC input voltage is too low
because of voltage drop across the
DC cables due to too long or too
narrow cables. Reduce the length of
the DC cables or use cables with a
larger gauge.
Loose or corroded connections:
Tighten the connections; burnt cables
must be corrected immediately.
Flat battery: Disconnect the load and
recharge the battery.

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Red
Solid (+ audible beep)
Shutdown:
Over Load
Protection
Reduce the load and/or check the AC
wiring for possible short circuits. Then
reset the inverter manually by
switching the main switch off and on
again.
Red
Intermittent blinking
Shutdown:
Fan failure
Contact your reseller.
Red
Intermittent blinking
Shutdown:
Hardware
failure
Contact your reseller.
Buzzer
The inverter is equipped with a buzzer. The buzzer sound is audible at start-up and when an error
occurs.