MUST EP18-5048 Autonomus Inverter Installation Guide

MUST EP18-5048 Autonomus Inverter

Product Information

This inverter is designed for parallel operation with two different operation modes:

1. Parallel operation in single phase with up to 3 units. The supported maximum output power is 15KVA (for 5KVA inverter) / 12KVA (for 4KVA inverter).
2. Maximum three units work together to support three-phase equipment. The supported maximum output power is 15KVA (for 5KVA inverter) / 12KVA (for 4KVA inverter).

Product Usage Instructions

Mounting the unit

Follow the instructions provided in the user manual to mount the unit properly.

Wiring Connection
Parallel Operation in Single Phase

1. Ensure correct wire connection.
2. Make sure all breakers in Line wires of load side are open and each Neutral wires of each unit are connected together.

Support Three-Phase Equipment

Step 1: Check the following requirements before commissioning:

• Correct wire connection.
• Ensure all breakers in Line wires of load side are open and each Neutral wires of each unit are connected together.

Step 2: DIP Switch Settings

On the bottom panel of the inverter, there are 5 pins DIP switches. Set them as shown in Figure 2.

NOTE: It’s necessary to turn off the machines when setting the DIP switches. Otherwise, the setting cannot be programmed.

Step 3: Turn on all units sequentially
Turn on each unit in sequence: L1-phase unit, L2-phase unit, L3-phase unit.

Step 4: Switch on all AC breakers of Line wires in Grid

If Grid is detected and three phases are matched with unit setting, they will work normally. Otherwise, the AC icon will flash and they will not work in line mode.

Fault Code Display

Refer to the table in the user manual for fault codes and their corresponding solutions.

Commissioning

Follow the instructions provided in the user manual to commission the inverter.

Troubleshooting

Refer to the troubleshooting section in the user manual for common issues and their solutions.

Introduction

This in verter can be used in par allel with two different operation modes.

1. Parallel operation in single phase with up to 3 units. The supported maximum output power is 15KVA(for 5KVA inverter)/12KVA (for 4KVA inverter).
2. Maximum three units work together to support three-phase equipment. The supported maximum output power is 15KVA(for 5KVA inverter)/12KVA (for 4KVA inverter).

Package Contents

In the case, you will find the following items in the package:

Mounting the unit

When installing multiple units, please follow below chart.

NOTE : For proper air circulation to dissipate heat, allow a clearance of approx. 30 cm to the side and approx. 50 cm above and below the unit. Be sure to install each unit in the same level.

Wiring Connection

The cable size of each inverter is shown as below:
Recommended battery breaker, cable and terminal size for each inverter:

WARNING : Be sure the length of all battery cables is the same. Otherwise, there will be voltage difference between inverter and battery to cause parallel inverters not working:

Recommended Grid and Load cable size for each inverter:

You need to connect the cables of each inverter together. Take the battery cables for example: You need to use a connector or bus-bar as a joint to connect the battery cables together, and then connect to the battery terminal. The cable size used from joint to battery should be X times cable size in the tables above. “X” indicates the number of inverters connected in parallel. Regarding Grid and Load, please also follow the same principle.
CAUTION!! Please install the breaker at the battery and Grid side. This will ensure the inverter can be securely disconnected during maintenance and fully protected from over current of battery or Grid. The recommended mounted location of the breakers is shown in the figures in 4-1 and 4-2.
*If you want to use only one breaker at the battery side for the whole system, the rating of the breaker should be X times current of 1 unit. “X” indicates the number of inverters connected in parallel.

Recommended breaker specification of Grid side with single phase:

• Note 1 : Also, you can use 40A breaker (50A for 5KVA), for only 1 unit,and each inverter has a breaker at its AC input.
• Note 2: Regarding three phase system, you can use 4 poles breaker, the rating is up to the current of the phase which has the maximum units. Or you can follow the suggestion of note 1

Recommended battery capacity

WARNING! Be sure that all inverters will share the same battery bank. Otherwise, the inverters will transfer to fault mode.

Parallel Operation in Single phase

Two inverters in parallel:
Power Connection

Communication Connection

• INVERTER : Setting the key 1 of DIP Switch to the bottom position, and the key 2,3,4,5 of DIP Switch to the top position.
• INVERTER : Setting the key 2 of DIP Switch to the bottom position, and the key 1,3,4,5 of DIP Switch to the top position.

Three inverters in parallel:

Power Connection

Communication Connection

• INVERTER(1 ): Setting the key 1 of DIP Switch to the bottom position, and the key 2,3,4,5 of DIP Switch to the top position.
• INVERTER 2: Setting the key 2 of DIP Switch to the bottom position, and the key 1,3,4,5 of DIP Switch to the top position.
• INVERTER(3): Setting the key 1,2 of DIP Switch to the bottom position, and the key 3,4,5 of DIP Switch to the top position.

Support 3-phase equipment

One inverter in each phase:
Power Connection

NOTE : No connect 3-phase equipment of delta connection

Communication Connection

• INVERTER: Setting the key 1,3 of DIP Switch to the bottom position, and the key 2,4,5 of DIP Switch to the top position.
• INVERTER: Setting the key 2,3 of DIP Switch to the bottom position, and thekey 1,4,5 of DIP Switch to the top position.
• INVERTER: Setting the key 1,2,3 of DIP Switch to the bottom position, and the key 4,5 of DIP Switch to the top position.

PV Connection

Please refer to user manual of single unit for PV Connection.
CAUTION : Each inverter should connect to PV modules separately.

Fault code display

Commissioning

Parallel in single phase

• Step 1:Check the following requirements before commissioning:
  Correct wire connection
  Ensure all breakers in Line wires of load side are open and each Neutral wires of each unit are connected together.

• Step 2: On the bottomt panel of inverter ,there are 5 pins DIP switches, you can set it as follow Figure 1.

  • NOTE 1 : If there are two inverter in parallel, you Only need to set inverter and inverter .
  • NOTE 2: It’s necessary to turn off the machines when setting the DIP switches. Otherwise, the setting can not be programmed.

• Step 3: Turn on each unit.

  • NOTE : Master and slave units are randomly defined.

• Step 4: Switch on all AC breakers of Line wires in Grid. It’s better to have all inverters connect to Grid at the same time. If not, it will display fault 82 in following-order inverters. However, these inverters will automatically restart. If detecting AC connection, they will work normally.

• Step 5: If there is no more fault alarm, the parallel system is completely installed.

• Step 6: Please switch on all breakers of Line wires in load side. This system will start to provide power to the load.

Support three-phase equipment

• Step 1: Check the following requirements before commissioning:
  Correct wire connection
  Ensure all breakers in Line wires of load side are open and each Neutral wires of each unit are connected together.

• Step 2: On the bottom panel of inverter ,there are 5 pins DIP switches, you can set it as follow Figure 2
  NOTE: It’s necessary to turn off the machines when setting the DIP switches. Otherwise, the setting can not be programmed.

• Step 3 : Turn on all units sequentially

• Step 4: Switch on all AC breakers of Line wires in Grid. If Grid is detected and three phases are matched with unit setting, they will work normally. Otherwise, the AC icon will flash and they will not work in line mode

• Step 5 : If there is no more fault alarm, the system to support 3-phase equipment is completely installed.

• Step 6: Please switch on all breakers of Line wires in load side. This system will start to provide power to the load.
  Note 1: To avoid overload occurring, before turning on breakers in load side, it s better to have whole system in operation first.
  Note 2 : Transfer time for this operation exists. Power interruption may happen to critical devices, which cannot bear transfer time.

Troubleshooting

Situation| ****

Solution

---|---
Fault

Code

| Fault Event Description
80| CAN data loss| 1. Check if communication cables are connected well and restart the inverter.

2. If the problem remains, please contact your

installer.

81| Host data loss
82| Synchronization data loss
83| The battery voltage of each inverter isnot the same.| 1. Make sure all inverters share same groups of batteries together.

2. If the problem remains, please contact your installer.

84| AC input voltage and frequency are detected different| 1. Check the utility wiring conncetion and restart the inverter.

2. If the problem remains, please contact your installer.

85| AC output current unbalance| 1. Restart the inverter.

2. If the problem remains, please contact your installer

86| AC output mode setting is different| 1. Switch off the inverter and check the DIP switch setting.

2. If the problem remains, please contact your

installer.

87| Current feedback into the inverter is detected.| 1. Restart the inverter.

2. If the problem remains, please contact your installer.

88| The firmware version of each inverter is not the same.| 1. Update all inverter firmware to the same version.

2. If the problem remains, please contact your

installer.

89| The output current of each inverter is different.| 1. Check if communication cables are connected well and restart the inverter.

2. If the problem remains, please contact your

installer.

90| CAN ID setting Error| 1. Switch off the inverter and check the DIP switch

setting.

2. If the problem remains, please contact your

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