2. Installation and connection - Movicom Electric Docs

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= Installation and connection =

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== Installation procedure ==

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The mounting area of the BMS Mini S must be protected from mechanical particles (dust, dirt, large objects) and water. The BMS Mini S is recommended to be placed close to the cells it controls, but away from high current circuits to reduce interference to measuring circuits and increase overall reliability of installation.

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The installation site must provide convenient access for subsequent connection to the device’s headers for connecting other system elements: a current sensor, contactors, display panels.

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The BMS Mini S has a heat sink to dissipate the heat generated during the balancing of the cells. When used in enclosed enclosures, heat must be removed from the sink, otherwise it may damage the device.

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Overall and mounting dimensions of the BMS Mini S are shown on figures below.

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[[image:1733740731815-730.png||data-xwiki-image-style-alignment="center" height="454" width="516"]]

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[[image:1733740731820-300.png||data-xwiki-image-style-alignment="center" height="172" width="453"]]

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|**Parameter**|**Value **

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|Overall dimensions (length × width × height), mm|124.5 × 117 × 17

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|Mounting dimensions (length × width), mm|115 × 111

|Mounting holes|M3

== Headers ==

There are names and locations of the BMS Mini S headers on figure below.

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[[image:1733740765989-365.png||data-xwiki-image-style-alignment="center" height="423" width="526"]]

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=== Х1 – header for contactors. ===

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[[image:1733738660904-795.jpeg||data-xwiki-image-style-alignment="center" height="96" width="316"]]

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|**Pin**|**Name**|**Description**

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|**1**|**-**|-

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|**2**|**+12V**|Supply voltage from the internal 12V DC/DC converter

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|**3**|**GND**|Ground

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|**4**|**+12V**|Supply voltage from the internal 12V DC/DC converter

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|**5**|**GND**|Ground

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|**6**|**+12V**|Supply voltage from the internal 12V DC/DC converter

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|**7**|**GND**|Ground

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|**8**|**+12V**|Supply voltage from the internal 12V DC/DC converter

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|**9**|**GND**|Ground

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|**10**|**-**|-

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|**11**|**FB1**|Feedback signal from contactor 1

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|**12**|**OUT1**|Contactor control 1 (low side switch), 100V, max 5A

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|**13**|**FB2**|Feedback signal from contactor 2

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|**14**|**OUT2**|Contactor control 2 (low side switch), 100V, max 5A

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|**15**|**FB3**|Feedback signal from contactor 3

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|**16**|**OUT3**|Contactor control 3 (low side switch), 100V, max 5A

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|**17**|**FB4**|Feedback signal from contactor 4

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|**18**|**OUT4**|Contactor control 4 (low side switch), 100V, max 5A

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**ATTENTION!!!**

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The load should be connected to +12V and OUTx pins. The feedback signal should be connected to FBx and GND pins. Below is an example of connecting the BMS to a contactor:

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[[image:1733738760833-185.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true"]]

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=== X2 – mini-USB connector. ===

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Mini-USB connector is used for configuring the BMS via ElectricDeviceMonitor.

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=== X3 – header for discrete inputs and outputs signals.[[image:1733738860923-996.png||data-xwiki-image-style-alignment="center" height="90" width="283"]] ===

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|**Pin**|**Name**|**Description**

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|**1**|**DIN1**|Discrete input 1 “dry contact” (+5V)

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|**2**|**DIN2**|Discrete input 2 “dry contact” (+5V)

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|**3**|**DIN3**|Discrete input 3 “dry contact” (+5V)

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|**4**|**DIN4**|Discrete input 4 “dry contact” (+5V)

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|**5**|**DOUT1**|Discrete output 1 (+5V, 20mA)

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|**6**|**DOUT2**|Discrete output 2 (+5V, 20mA)

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|**7**|**DOUT3**|Discrete output 3 (+5V, 20mA)

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|**8**|**DOUT4**|Discrete output 4 (+5V, 20mA)

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|**9**|**GND**|Discrete input 1 “dry contact” (ground)

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|**10**|**GND**|Discrete input 2 “dry contact” (ground)

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|**11**|**GND**|Discrete input 3 “dry contact” (ground)

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|**12**|**GND**|Discrete input 4 “dry contact” (ground)

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|**13**|**GND**|Discrete output 1 (ground)

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|**14**|**GND**|Discrete output 2 (ground)

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|**15**|**GND**|Discrete output 3 (ground)

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|**16**|**GND**|Discrete output 4 (ground)

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=== Х4 – header for САN and RS485 interfaces. ===

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[[image:1733738660905-974.jpeg||data-xwiki-image-style-alignment="center" height="70" width="97"]]

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|**Pin**|**Name**|**Description**

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|**1**|**RS485_B**|RS485 line B

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|**2**|**+5V**|Isolated supply voltage 5V, max 400mA

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|**3**|**CAN_L**|CAN-L line of the CAN bus

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|**4**|**RS485_A**|RS485 line A

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|**5**|**GND**|Isolated ground

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|**6**|**CAN_H**|CAN-H line of the CAN bus

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=== Х5 – header for ON/OFF button.[[image:1733739076878-324.png||data-xwiki-image-style-alignment="center" height="70" width="41"]] ===

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|**Pin**|**Name**|**Description**

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|**1**|**BTN**|Signal to turn on/off the BMS (“dry contact”, +3.3V)

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|**2**|**GND**|Signal to turn on/off the BMS (“dry contact”, ground)

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=== X6 – header for cells temperature sensors. ===

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[[image:1733738660906-697.png||data-xwiki-image-style-alignment="center" height="91" width="190"]]

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|**Pin**|**Name**|**Description**

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|**1**|**TEMPG1**|Ground of the thermistor 1

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|**2**|**TEMPG2**|Ground of the thermistor 2

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|**3**|**TEMPG3**|Ground of the thermistor 3

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|**4**|**TEMPG4**|Ground of the thermistor 4

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|**5**|**TEMPG5**|Ground of the thermistor 5

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|**6**|**TEMPG6**|Ground of the thermistor 6

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|**7**|**TEMP1**|Signal from the thermistor 1

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|**8**|**TEMP2**|Signal from the thermistor 2

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|**9**|**TEMP3**|Signal from the thermistor 3

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|**10**|**TEMP4**|Signal from the thermistor 4

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|**11**|**TEMP5**|Signal from the thermistor 5

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|**12**|**TEMP6**|Signal from the thermistor 6

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=== X7 - header for current sensor.[[image:1733739118831-618.png||data-xwiki-image-style-alignment="center" height="79" width="71"]] ===

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|**Pin**|**Name**|**Description**

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|**1**|**+5V**|Supply voltage for a current sensor 5V, max 50 mA

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|**2**|**GND**|Ground

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|**3**|**Vcs**|ADC input (current sensor output)

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|**4**|**Vref**|Auxiliary ADC input (current sensor reference signal)

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=== Х8 – header for battery cells ===

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[[image:1733740846257-439.png||data-xwiki-image-style-alignment="center" height="89" width="219"]]

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|**Pin**|**Name**|**Description**

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|**1**|**C0**|Minus of the cell stack (for measuring purposes only)

|**2**|**C2**|Cell 2

|**3**|**C4**|Cell 4

|**4**|**C6**|Cell 6

|**5**|**C8**|Cell 8

|**6**|**C10**|Cell 10

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|**7**|**C12**|Cell 12 (maximum potential of the cell stack, for measuring purposes only)

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|**8**|**NC**|Not connected

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|**9**|**C1**|Cell 1 (minimum potential with respect to C0)

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|**10**|**C3**|Cell 3

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|**11**|**C5**|Cell 5

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|**12**|**C7**|Cell 7

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|**13**|**C9**|Cell 9

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|**14**|**C11**|Cell 11

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=== Х9 – header to power the device ===

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[[image:1733738660910-242.png||data-xwiki-image-style-alignment="center" height="61" width="78"]]

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|**Pin**|**Name**|**Description**

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|**1**|**VBAT+**|Supply voltage for BMS Mini S

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|**2**|**VBAT-**|BMS Mini S power ground

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**Attention! **The BMS Mini S device is **galvanically connected** to the battery (the minus of the battery is the device ground). In view of this, when a BMS Wi-Fi or BMS GSM module is connected to the device, the antenna braid will also be galvanically connected to the battery (connected to the battery negative). It is recommended to** isolate the antenna cable from the battery case **to prevent negative potential from appearing on the case.

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=== J1 – jumper for switching CAN bus terminal resistor ===

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To connect the terminal resistor between the** CAN_H** and **CAN_L** lines, install the jumper J1 according to the following figure:

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[[image:1733738660910-372.png||data-xwiki-image-style-alignment="center" height="85" width="162"]]

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=== J2 – jumper for switching RS-485 terminal resistor ===

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To connect the terminal resistor between the** RS485_A** and **RS485_B** lines, install the jumper J1 according to the following figure:

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[[image:1733738660910-372.png||data-xwiki-image-style-alignment="center" height="85" width="162"]]

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== Connection procedure ==

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=== Connecting battery cells ===

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To connect battery cells, follow figure below. Incorrect connection of the cells can damage the BMS Mini.

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Begin the connection with the negative line of the battery: the “C0“ is connected to the “B-“, then the first cell (C1) is connected, then the second (С2), etc. If not all inputs of the cells are used, then the remaining inputs are connected to the cell with the most potential.

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[[image:1733740980966-804.png||data-xwiki-image-style-alignment="center" height="471" width="721"]]

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**Attention!**

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Connect the battery according to the diagram, otherwise the device may be damaged.