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Mass Combi Ultra, Mass Combi Pro 

– Installation Manual Multiple Units 

Parallel configuration with DIP switches 

 
 

 

11

 

 

 

 

 

 

4  PARALLEL CONFIGURATION WITH DIP SWITHES 

Two units can be set in parallel with DIP-switches. This can be two identical MCU or MCP units. Provided that they use the 
same DC voltage, this can also be one MCU and one MCP. 

4.1 

Materials needed 

Description 

Quantity 

Two units 

Temperature sensor with cable and plug (included) 

 

MasterBus Terminator (included but not always needed) 

 

MasterBus cables between units (product code e.g. 3 meter: 77040300) 

Sync cables to interconnect all units (product code e.g. 3 meter: 6502000030)  1 

DC + cable with fuse 

DC 

– cable 

AC cable to connect the AC input of the unit to an external power source 

AC cable to connect the external load to 

OUTPUT

 1 

AC cable to connect the external load to 

OUTPUT

 2 

4.2 

Preparation 

-

 

Make sure that all power sources (AC and DC) are switched off. 

4.3 

DC wiring of parallel units 

Note: 

Always use the same length positive and negative cables! Be aware that to keep the drawings in this chapter clear and 
easy to read, the cable lengths have not been drawn in proportion to each other. 

 

Power system 

DC cable cross 
section 

Inline fuse 

Recommended 
battery bank 

Indicated cable sizes are for cables from 
unit to busbar and shorter than 3m. Cables 

from busbar to battery bank should be 
twice the diameter. When cables are 
longer than 3m, the size should be 
increased to compensate for cable losses. 

12V 

95 mm

2

 

350 A 

800 Ah 

24V 

50 mm

2

 

175 A 

400 Ah 

48V 

35 mm

2

 

80 A 

200 Ah 

FUSE 

FUSE 

BUSBAR 

BATTERY 
SWITCH 

BATTERY BANK 

Summary of Contents for MASS COMBI PRO

Page 1: ...MULTIPLE UNITS MASS COMBI ULTRA MASS COMBI PRO Parallel or three phase configurations INSTALLATION MANUAL 10000007117 03 ...

Page 2: ...nits 8 3 6 Configuration with MasterAdjust 8 3 7 Initial start up 10 4 PARALLEL CONFIGURATION WITH DIP SWITHES 11 4 1 Materials needed 11 4 2 Preparation 11 4 3 DC wiring of parallel units 11 4 4 AC wiring of parallel units 12 4 5 Network wiring of parallel units 12 4 6 Configuration with DIP switches 13 4 7 Initial start up 13 5 THREE PHASE CONFIGURATION WITH MASTERADJUST 14 5 1 Materials needed ...

Page 3: ...rallel to maintain reliable power supply If one of the units should fail the remaining units continue Three MCU or MCP units can be installed in a 3 phase configuration to supply three phase AC power for high power loads like air conditioning By connecting more units in parallel as well virtually unlimited three phase power can be made available 1 4 General installation guidelines When using units...

Page 4: ...ry positive 4 Secondary battery positive 5 Solar DC terminal 6 Mains AC input terminal 7 Generator AC input terminal 8 AC output 1 9 AC output 2 switched 10 DIP switch units 2x8 11 Fan 3x 12 Ground stud 13 Sync connector 2x 14 Temperature sensor connector 15 MasterBus connector 2x MCU 12 3000 150 and 24 3500 100 only Remove the cover by loosening these two screws ...

Page 5: ...e 14 for the 3 phase with MasterAdjust installation procedure Start 3 Phase More than 2 units Lithium Ion Batteries Click here or go to page 6 for the parallel with MasterAdjust installation procedure YES Parallel configuration 3 Phase configuration NO Click here or go to page 11 for the parallel with DIP switches installation procedure YES NO NO YES Setup via DIP switches NO YES ...

Page 6: ...roduct code e g 3 meter 77040300 n 1 Sync cables to interconnect all units product code e g 3 meter 6502000030 n 1 MasterBus USB Interface product code 77030100 1 Windows based PC with the MasterAdjust configuration tool 1 DC cable with fuse n DC cable n AC cable to connect the AC input of the unit to an external power source n AC cable to connect the external load to OUTPUT 1 n AC cable to connec...

Page 7: ...ction Inline fuse Recommended battery bank Indicated cable sizes are for cables from unit to busbar and shorter than 3m Cables from busbar to battery bank should be twice the diameter When cables are longer than 3m the size should be increased to compensate for cable losses 12V 95 mm2 350 A 800 Ah 24V 50 mm2 175 A 400 Ah 48V 35 mm2 80 A 200 Ah 3 4 AC wiring of parallel units Neutral to ground bond...

Page 8: ...Switch on all units 7 If not already available connect a MasterBus USB Interface to the MasterBus network and to a PC and open MasterAdjust Installation or configuration errors may come up in MasterAdjust while the configuration is in progress This is normal Configuration 8 In MasterAdjust check that the units are running the latest firmware software version See the Mastervolt Portal for more info...

Page 9: ...ured the same on all units 12 Return to the Configuration tab of the Primary unit All settings are done here However if Mastervolt Lithium Ion batteries are connected all events like Stop Discharge for example must be configured for ALL units separately 13 From the Cluster drop down list select Single Phase You may need to maximize the MasterAdjust window or scroll all the way to the right to see ...

Page 10: ...tion state of the cluster Click the Activate cluster button to finish the cluster configuration In the device list in the left pane of MasterAdjust the Replica unit s will now be listed under the Primary unit 3 7 Initial start up 1 Switch all units off and on again 2 Check that the units are working as inverter 3 Close the AC breaker in the Mains Input of each unit 4 Check that the units are worki...

Page 11: ...C input of the unit to an external power source 2 AC cable to connect the external load to OUTPUT 1 2 AC cable to connect the external load to OUTPUT 2 2 4 2 Preparation Make sure that all power sources AC and DC are switched off 4 3 DC wiring of parallel units Note Always use the same length positive and negative cables Be aware that to keep the drawings in this chapter clear and easy to read the...

Page 12: ... size Max 3 5 kW 2 5 mm2 20 A 3 6 7 kW 4 0 mm2 40 A 7 1 10 kW 6 0 mm2 50 A 10 kW 10 0 mm2 63 A Mains power AC cable cross section Max 16 A 3x 2 5 mm2 Max 32 A 3x 4 0 mm2 4 5 Network wiring of parallel units Residual Current Device RCD Circuit Breaker no RCD Breaker AC OUT 2 50 A max PRIMARY UNIT REPLICA UNIT Battery temperature sensor Sync cable MasterBus cable MasterBus network or terminator Mast...

Page 13: ...eplica unit keep DIP switch A1 off position 0 and set A2 on position 1 All other DIP switches B1 B8 and A3 A8 on the Replica unit must match the settings on the Primary unit For an overview of DIP switch settings please see the user manual 4 7 Initial start up 1 Install the DC fuses and close the battery switch 2 Close the covers of all units 3 Close the AC breaker in AC output 1 of each unit 4 Sw...

Page 14: ... MasterBus cables between units product code e g 3 meter 77040300 2 Sync cables to interconnect all units product code e g 3 meter 6502000030 2 MasterBus USB Interface product code 77030100 1 Windows based PC with the MasterAdjust configuration tool 1 DC cable with fuse 3 DC cable 3 AC cable to connect the AC input of the unit to an external power source 3 AC cable to connect the external load to ...

Page 15: ...ted cable sizes are for cables from unit to busbar and shorter than 3m Cables from busbar to battery bank should be twice the diameter When cables are longer than 3m the size should be increased to compensate for cable losses 12V 95 mm2 350 A 800 Ah 24V 50 mm2 175 A 400 Ah 48V 35 mm2 80 A 200 Ah 5 4 AC wiring of three phase units Mains power cable cross section 2 5 mm2 Generator power AC cable cro...

Page 16: ...ts are running the latest firmware See the Mastervolt Portal for more information 8 In the device list in the left pane of MasterAdjust right click the L1 unit and select Login 9 Select Installer and enter the installer code 10 Go to the Configuration tab and give the unit a logical name For example MCU L1 MCU L2 and MCU L3 11 Return to the Configuration tab of the L1 unit All settings are done he...

Page 17: ...wn list select PER PHASE the number of units in parallel Primary Replica In our example this is 1 14 Click the Select devices button to be able to select the L2 and L3 units In the Phase L2 section from the Phase master Primary drop down list select the L2 unit In the Phase L3 section from the Phase master Primary drop down list select the L3 unit ...

Page 18: ...will only switch over to charger mode if all three phases are present and accepted gen and or mains 5 8 General remark on three phase public power grids Depending on national guidelines the rotation of the three phase public grid can be different The field rotation of the configured Combi system is always L1 L2 L3 L1 L2 L3 etc If the public grid has a in respect to the Combi rotation reverse rotat...

Page 19: ...ble throw switch of at least 32A 400V Use of an AC 1x6 relay controlled by MasterBus product code 77031500 To control the relay suitable events need to be configured This can be done from an EasyView 5 for example See the relevant user manual for more information on events INCOMING THREE PHASE N 400 230 TO MASTERVOLT COMBI UNITS L1 L2 L3 ...

Page 20: ... are not connected to each other breakers The Mains LED on the Replica unit will keep blinking while the same LED on the Primary unit will be solid on when the MAINS AC input is accepted This normal behavior Likewise LED GEN on the Replica unit will keep blinking while the same LED on the Primary unit will be solid on when the GEN AC input is accepted This is also normal behavior LED 1 is MCU 12 3...

Page 21: ...in overload inverted power exceeds 3500 W Check the load connected and disconnect 10 red Battery low Battery voltage low Stop inverting start charging 11 blinking Error in sec charger Internal Hardware error Contact Mastervolt 10 blinking red Charging a low battery Disconnect all DC loads Errors MCU MCP shuts down 4 and 10 red 5 yellow Overtemperature Combi too hot Restart when alarm is over Check...

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