Skip to Content

Wiki source code of 2. Installation and connection

Version 16.1 by Admin on 2025/02/20 12:51
Show last authors
1 (% data-numbered-headings-start="2" style="--numbered-headings-start: 1;font-size: 0px;color: rgba(0, 0, 0, 0.0);margin-bottom: 0px; margin-top: 0px;" %)
2 = Installation and connection =
3
4 == ​​​​​Installation procedure ==
5
6 The mounting area of the BMS Logic 18 must be protected from mechanical particles (dust, dirt, large objects) and water. The BMS Logic 18 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.
7
8 The installation site must provide convenient access for subsequent connection to the device’s headers.
9
10 The BMS Logic 18 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.
11
12 Overall and mounting dimensions of the BMS Logic 18 are shown below.
13
14 [[image:1736771889450-259.png||data-xwiki-image-style-alignment="center" height="405" width="600"]]
15
16 |**Parameter**|**Value**
17 |(((
18 Overall dimensions (length × width × height), mm
19 )))|214 × 140 × 16
20 |Mounting dimensions (length × width), mm|198 × 132
21 |Mounting holes|M4
22 |Headers X1-X5 type|Molex series Micro-Fit
23
24 == Headers ==
25
26 The BMS Logic 18 is designed to measure temperature and voltage of 18 battery cells.
27
28 [[image:1736770801015-488.png||data-xwiki-image-style-alignment="center" height="350" width="600"]]
29
30 (% class="box warningmessage" %)
31 (((
32 **Attention!**
33 All headers are shown from the device side!
34 )))
35
36 === X1 – header for cells ===
37
38 Receptacle Housing: Molex 430252000. Terminals: Molex 43030
39
40 [[image:1733150257406-647.jpeg||data-xwiki-image-style-alignment="center" height="73" width="256"]]
41
42 |**Pin**|**Name**|**Description**
43 |**1**|**V-**|Minus of the cell stack
44 |**2**|**C2**|Cell #2
45 |**3**|**C4**|Cell #4
46 |**4**|**C6**|Cell #6
47 |**5**|**C8**|Cell #8
48 |**6**|**C10**|Cell #10
49 |**7**|**C12**|Cell #12
50 |**8**|**C14**|Cell #14
51 |**9**|**C16**|Cell #16
52 |**10**|**C18**|Cell #18 (maximum potential of the cell stack)
53 |**11**|-|-
54 |**12**|**C1**|Cell #1 (minimum potential with respect to V-)
55 |**13**|**C3**|Cell #3
56 |**14**|**C5**|Cell #5
57 |**15**|**C7**|Cell #7
58 |**16**|**C9**|Cell #9
59 |**17**|**C11**|Cell #11
60 |**18**|**C13**|Cell #13
61 |**19**|**C15**|Cell #15
62 |**20**|**C17**|Cell #17
63
64 === X2 – header 1 for temperature sensors ===
65
66 Receptacle Housing: Molex 430251800. Terminals: Molex 43030
67
68 [[image:1733150257408-172.jpeg||data-xwiki-image-style-alignment="center" height="81" width="267"]]
69
70 |**Pin**|**Name**|**Description**
71 |**1**|**TEMPG9**|Ground of the thermistor #9
72 |**2**|**TEMPG8**|Ground of the thermistor #8
73 |**3**|**TEMPG7**|Ground of the thermistor #7
74 |**4**|**TEMPG6**|Ground of the thermistor #6
75 |**5**|**TEMPG5**|Ground of the thermistor #5
76 |**6**|**TEMPG4**|Ground of the thermistor #4
77 |**7**|**TEMPG3**|Ground of the thermistor #3
78 |**8**|**TEMPG2**|Ground of the thermistor #2
79 |**9**|**TEMPG1**|Ground of the thermistor #1
80 |**10**|**TEMP9**|Signal from the thermistor #9
81 |**11**|**TEMP8**|Signal from the thermistor #8
82 |**12**|**TEMP7**|Signal from the thermistor #7
83 |**13**|**TEMP6**|Signal from the thermistor #6
84 |**14**|**TEMP5**|Signal from the thermistor #5
85 |**15**|**TEMP4**|Signal from the thermistor #4
86 |**16**|**TEMP3**|Signal from the thermistor #3
87 |**17**|**TEMP2**|Signal from the thermistor #2
88 |**18**|**TEMP1**|Signal from the thermistor #1
89
90 === X3 – header 2 for temperature sensors ===
91
92 Receptacle Housing: Molex 430251800. Terminals: Molex 43030
93
94 [[image:1733150257410-796.jpeg||data-xwiki-image-style-alignment="center" height="81" width="268"]]
95
96 |**Pin**|**Name**|**Description**
97 |**1**|**TEMPG18**|Ground of the thermistor #18
98 |**2**|**TEMPG17**|Ground of the thermistor #17
99 |**3**|**TEMPG16**|Ground of the thermistor #16
100 |**4**|**TEMPG15**|Ground of the thermistor #15
101 |**5**|**TEMPG14**|Ground of the thermistor #14
102 |**6**|**TEMPG13**|Ground of the thermistor #13
103 |**7**|**TEMPG12**|Ground of the thermistor #12
104 |**8**|**TEMPG11**|Ground of the thermistor #11
105 |**9**|**TEMPG10**|Ground of the thermistor #10
106 |**10**|**TEMP18**|Signal from the thermistor #18
107 |**11**|**TEMP17**|Signal from the thermistor #17
108 |**12**|**TEMP16**|Signal from the thermistor #16
109 |**13**|**TEMP15**|Signal from the thermistor #15
110 |**14**|**TEMP14**|Signal from the thermistor #14
111 |**15**|**TEMP13**|Signal from the thermistor #13
112 |**16**|**TEMP12**|Signal from the thermistor #12
113 |**17**|**TEMP11**|Signal from the thermistor #11
114 |**18**|**TEMP10**|Signal from the thermistor #10
115
116 === X4, X5 – headers for communication with BMS Main ===
117
118 Receptacle Housing: Molex 430250400. Terminals: Molex 43030
119
120 [[image:1733150513230-598.png||data-xwiki-image-style-alignment="center" height="89" width="81"]]
121
122 |**Pin**|**Name**|**Description**
123 |**1**|**RS485_A**|RS-485 line A for communication with the BMS Main
124 |**2**|**RS485_B**|RS-485 line B for communication with the BMS Main
125 |**3**|**+5V**|Supply voltage 5V
126 |**4**|**GND**|Ground
127
128 == Switches and Indicators ==
129
130 === SWD1 – address switch ===
131
132 |**Switch number**|**Description**
133 |**1**|The first (the lowest) bit of the address. Position ON - bit is 1
134 |**2**|The second bit is the address. Position ON - bit is 1
135 |**3**|The third bit of the address. Position ON - bit is 1
136 |**4**|The fourth bit of the address. Position ON - bit is 1
137 |**5**|The fifth (the highest) bit of the address. Position ON - bit is 1
138
139 (% class="box infomessage" %)
140 (((
141 **Note: **There is no SWD1 switch in the recent revisions of the BMS Logic 18. The device address must be configured in the settings (see the section [[3. Configuration>>doc:Battery management systems.BMS Logic 18.3\. Configuration.WebHome]]).
142 )))
143
144 === SWD2 – RS-485 termination resistor switch ===
145
146 To connect the termination resistor between the **RS485_A** and **RS485_B** lines, switch SWD2 to the ON position.
147
148 (% class="box infomessage" %)
149 (((
150 **Note: **There is no SWD2 switch in the recent revisions of the BMS Logic 18. Connect a 120 Ohm termination resistor directly to the X5 connector between the lines RS485_A and RS485_B.
151 )))
152
153 === DS1 – mode indicator ===
154
155 (% style="width:551px" %)
156 |(% style="width:188px" %)**State**|(% style="width:362px" %)**Description**
157 |(% style="width:188px" %)**Blinking**|(% style="width:362px" %)Connection between the BMS Main and the device is established
158 |(% style="width:188px" %)**Short flashing (~~50 milliseconds in a second)**|(% style="width:362px" %)The device is measuring voltage and temperature. No communication between the BMS Main and the device
159 |(% style="width:188px" %)**Long flashing (1 second in a 2 second period)**|(% style="width:362px" %)The device is in the bootloader mode
160
161 == Connection procedure ==
162
163 === Connection to BMS Main ===
164
165 To connect the BMS Main to BMS Logic 18 do the following steps:
166
167 1. Connect the BMS Main to the first BMS Logic 18 (P15 -> X4);
168 1. Connect the BMS Logic 18 to each other (X5 -> X4);
169 1. Switch SWD2 on the last BMS Logic 18 to the ON position or connect a 120 Ohm termination resistor directly to the X5 connector of the last BMS Logic 18.
170
171 (% class="box infomessage" %)
172 (((
173 **Recommendations:**
174 ~1. The total cable length (the sum of the lengths of all cables) between the BMS Main and the last BMS Logic 18 should not exceed 500 meters.
175 2. Make all connections with the same cable.
176 3. For a total cable length of more than 10 meters use twisted pair with the 120 Ohm wave impedance.
177 )))
178
179 === Connecting battery cells ===
180
181 To connect the battery cells, follow figure below. Incorrect connection of the cells can damage the BMS Logic 18.
182
183 Begin the connection with the negative of the battery: the "V-" of the first BMS Logic 18 is connected to "B-", then the first cell (C1) of the battery is connected, then the second (C2), etc. The “V-“ of the next BMS Logic 18 is connected to the C18 of the previous BMS Logic 18. If not all inputs of the cells are used, then the remaining inputs are connected to the cell with the most potential.
184
185
186 [[image:1733151263524-832.jpeg||data-xwiki-image-style-alignment="center" height="492" width="612"]]
187
188 (% class="box warningmessage" %)
189 (((
190 **Attention!**
191 Connect the battery according to the diagram, otherwise the device may be damaged!
192 )))
193
194 === Connecting thermistors ===
195
196 Thermistors should be fastened to the cells, excluding short circuits to the cell terminals (for example, isolate thermistors with heat shrink). For reliable operation, it is recommended to use all thermistors (a temperature sensor per cell).
197
198 [[image:1733231170607-745.png||data-xwiki-image-style-alignment="center" height="324" width="806"]]
199
200