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Wiki source code of 3.4 Protections

Version 9.1 by Admin on 2025/02/28 15:26
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Admin 1.1 1 (% data-numbered-headings-start="3" style="--numbered-headings-start: 2;font-size: 0px;color: rgba(0, 0, 0, 0.0);margin-bottom: 0px; margin-top: 0px;" %)
2 = Settings =
3
4 (% data-numbered-headings-start="4" style="--numbered-headings-start: 3;font-size: 0px;color: rgba(0, 0, 0, 0.0);margin-bottom: 0px; margin-top: 0px;" %)
5 == Protections ==
6
Admin 2.1 7 The BMS Main X monitors the battery modules, compares the voltages and currents of the modules, and protects the battery system from damage.
Admin 1.1 8
Admin 3.2 9 (% class="box errormessage" %)
10 (((
11 **Attention!**
12 Behavior of contactors at different errors is configured in **corresponding contactor settings**!
13 )))
14
15 === Charging current limit ===
16
17 The BMS Main X device protects the battery from charging current higher than estimated current limit.
18
19 To configure parameters of the charge current limit, select the "Protections → Charge current limit" section:
20
21 [[image:1740754371437-635.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="142" width="800"]]
22
Admin 4.2 23 In this section:
Admin 3.2 24
Admin 4.2 25 * Enable – a flag to enable the protection;
26 * Threshold to switch from Region 1 to Region 2 – a threshold current value, dividing regions 1 and 2 with their error generation conditions, A;
27 * Region 1: Current difference – an absolute difference of measured battery current and calculated value “Charge current limit”, at which error is generated (condition for Region 1), A;
28 * Region 2: Current difference – a relative difference of measured battery current and calculated value “Charge current limit”, at which error is generated (conditions for Region 2), %;
29 * Delay before setting the error, millisecond;
30 * Delay before clearing the error, second;
31 * Lock – a flag to block the error until the device is restarted.
32
33 As a result of the operation of the charging current limit protection, the “Current limit error (CH)” is generated.
34
35 Error generation conditions:
36
37 * if the current is positive, less than “Threshold to switch from Region 1 to Region 2” value and exceeds “Charge current limit” by the “Region 1: Current difference” value during the “Delay before setting the error” time;
38 * if the current is positive, more than “Threshold to switch from Region 1 to Region 2” value and exceeds “Charge current limit” by the (“Region 2: Current difference” × “Charge current limit”) / 100 value during the “Delay before setting the error” time.
39
40 Error is cleared if conditions for generating an error do not apply during the “Delay before clearing the error” time.
41
42 === Discharging current limit ===
43
44 The BMS Main X device protects the battery from discharging current higher than estimated current limit.
45
46 To configure parameters of the charge current limit, select the "Protections → Discharge current limit " section:
47
48 [[image:1740754420820-767.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="138" width="800"]]
49
50 In this section:
51
52 * Enable – a flag to enable the protection;
53 * Threshold to switch from Region 1 to Region 2 – a threshold current value, dividing regions 1 and 2 with their error generation conditions, A;
54 * Region 1: Current difference – an absolute difference of measured battery current and calculated value “Discharge current limit”, at which error is generated (condition for Region 1), A;
55 * Region 2: Current difference – a relative difference of measured battery current and calculated value “Discharge current limit”, at which error is generated (conditions for Region 2), %;
56 * Delay before setting the error, millisecond;
57 * Delay before clearing the error, second;
58 * Lock – a flag to block the error until the device is restarted.
59
60 As a result of the operation of the charging current limit protection, the “Current limit error (DCH)” is generated.
61
62 Error generation conditions:
63
64 * if the current is negative, and the current modulus is less than “Threshold to switch from Region 1 to Region 2” value and exceeds “Discharge current limit” by the “Region 1: Current difference” value during the “Delay before setting the error” time;
65 * if the current is negative, and the current modulus is more than “Threshold to switch from Region 1 to Region 2” value and exceeds “Discharge current limit” by the (“Region 2: Current difference” × “Discharge current limit”) / 100 value during the “Delay before setting the error” time.
66
67 Error is cleared if conditions for generating an error do not apply during the “Delay before clearing the error” time.
68
Admin 1.1 69 === Battery cover ===
70
71 The BMS Main X device detects the opening of the battery cover and performs a protective opening of the contactors.
72
73 Battery cover protection is configured in the "Protections - Battery cover" section:
74
Admin 4.2 75 [[image:1734356776691-451.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="88" width="800"]]
Admin 1.1 76
77 In this section:
78
79 * Enable – a flag to enable the protection;
80 * Delay before setting the error;
81 * Delay before clearing the error;
82 * Lock – a flag to block the error until the device is restarted.
83
84 As a result of the protection against opening the battery cover, the “Battery cover” error is generated. Conditions for generating the error:
85
86 * presence of the “Battery cover” signal during the “Delay before setting the error” time.
87
88 Conditions for clearing the error:
89
90 * no “Battery cover” signal during the “Delay before clearing the error” time.
91
92 (% class="box warningmessage" %)
93 (((
Admin 4.2 94 If there is the "Battery cover" error, the **"Critical error flag" is generated.**
Admin 1.1 95 )))
96
97 === Insulation ===
98
99 The BMS Main X device detects a signal from an external insulation monitoring device (e.g., Bender IR155) and performs a protective opening of the contactors.
100
101 Insulation protection is configured in the "Protections - Insulation" section:
102
Admin 5.2 103 [[image:1740754491323-815.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="121" width="800"]]
Admin 1.1 104
105 In this section:
106
Admin 5.2 107 * Enable – a flag to enable the protection;
108 * Checking algorithm – isolation checking mode:
109 ** Always on – check is always performed;
110 ** On charging – check is performed only if the “Charge request” is set;
111 ** Except charging - check is performed only if the “Charge request” is cleared;
112 * Delay before setting the error, second;
113 * Delay before clearing the error, second;
Admin 1.1 114 * Lock – a flag to block the error until the device is restarted.
115
Admin 5.2 116 The “Insulation fault” is set if the “Insulation status” signal is detected during the “Delay before setting the error” time. The “Insulation status” signal can be received through the discrete input or by the CAN bus from an insulation monitoring device. The “Insulation fault” is cleared if the “Insulation status” signal is cleared during the “Delay before clearing the error” time.
Admin 1.1 117
118 (% class="box warningmessage" %)
119 (((
Admin 5.2 120 If there is the "Insulation fault" error, **the critical error flag is generated.**
Admin 1.1 121 )))
122
123 === Contactor feedback ===
124
Admin 2.1 125 The BMS Main X device detects the feedback signals from the main contactors and, in the event of a discrepancy between the feedback signals from the control signals, performs a protective opening of the contactors.
Admin 1.1 126
127 Contactor feedback protection is configured in the “Protections – Contactor feedback” section:
128
Admin 5.2 129 [[image:1734356776695-557.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="89" width="800"]]
Admin 1.1 130
131 In this section:
132
133 * Enable – a flag to enable the protection;
134 * Delay before setting the error;
135 * Delay before clearing the error;
136 * Lock – a flag to block the error until the device is restarted.
137
138 As a result of the protection against contactor failures, the errors "CH contactor feedback error", "DCH contactor feedback error", "CH/DCH contactor feedback error" are generated. Conditions for generating the errors:
139
140 * feedback signal from the contactor differs from the contactor control signal for the time "Delay before setting the error".
141
142 Conditions for clearing the error:
143
144 * feedback signal from the contactor repeats the contactor control signal for the time "Delay before clearing the error".
145
146 (% class="box warningmessage" %)
147 (((
Admin 5.2 148 If there is the “CH contactor feedback error”, “DCH contactor feedback error”, or “CH/DCH contactor feedback error”, **the critical error flag is generated.**
Admin 1.1 149 )))
150
151 === Module offline ===
152
153 The BMS Main X device detects the loss of communication with the battery modules and performs a protective opening of the contactors.
154
155 Protection against loss of communication with battery modules is configured in the "Protections - Module offline" section:
156
Admin 6.2 157 [[image:1740754588971-137.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="118" width="800"]]
Admin 1.1 158
159 In this section:
160
Admin 6.2 161 * Enable – a flag to enable the protection;
162 * Number of offline modules to set the error;
163 * Delay before setting the error, second;
164 * Delay before clearing the error, second;
165 * Lock – lock the error until the device is reset.
Admin 1.1 166
Admin 6.2 167 As a result of the protection from loss of communication with battery modules, the "Module offline" error is generated.
Admin 1.1 168
Admin 6.2 169 Error generation conditions:
Admin 1.1 170
Admin 6.2 171 * more than “Number of offline modules to set the error” battery modules do not respond to the commands of the BMS Main 3X device within “Delay before setting the error” time.
Admin 1.1 172
Admin 6.2 173 Conditions for removing the error:
Admin 1.1 174
Admin 6.2 175 * less than “Number of offline modules to set the error” battery modules do not respond to the commands of the BMS Main 3X device within “Delay before clearing the error” time.
176
Admin 1.1 177 (% class="box warningmessage" %)
178 (((
Admin 6.2 179 If there is the "Module offline" error, **“Critical error” is generated.**
Admin 1.1 180 )))
181
Admin 6.2 182 === Voltage unbalance (in any state) ===
Admin 1.1 183
184 Before closing the contactors for charging and discharging battery modules, the BMS Main X device detects those modules whose voltage is significantly different from the rest. For unbalanced modules, errors "Voltage unbalance (CH)" (charge circuit) and "Voltage unbalance (DCH)" (discharge circuit) are generated.
185
Admin 6.2 186 Protection against voltage unbalance of battery modules is configured in the section "Protections - Voltage unbalance (in any state)":
Admin 1.1 187
Admin 7.2 188 [[image:1740754732291-420.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="127" width="800"]]
Admin 1.1 189
190 In this section:
191
192 * Enable – a flag to enable the protection;
193 * Delta voltage – maximum allowable voltage difference of battery modules, V;
Admin 7.4 194 * Use the open circuit voltage to detect the error – a flag to enable U,,ocv,, correction;
Admin 1.1 195 * Delay before setting the error;
196 * Delay before clearing the error;
Admin 7.4 197 * Set the 'Voltage unbalance' error for the modules that are not ready to charge/discharge;
Admin 1.1 198 * Lock – a flag to block the error until the device is restarted.
199
Admin 6.2 200 As a result of the operation of the voltage unbalance protection the errors “Voltage unbalance (CH)” and “Voltage unbalance (DCH)” are generated.
Admin 1.1 201
Admin 6.2 202 Conditions for generating the error:
203
Admin 7.4 204 * battery module is not included in the largest group of modules whose voltages differ from each other by no more than "Delta voltage" during the "Delay before setting the error" time;
205 * module is not ready to charge or discharge;
Admin 1.1 206
207 Conditions for clearing the error:
208
Admin 7.4 209 * battery module is in the largest group of balanced modules during the "Delay before clearing the error" time;
210 * module is ready to charge or discharge.
Admin 1.1 211
Admin 6.2 212 === Current unbalance (in “Balancing” state) ===
Admin 1.1 213
Admin 2.1 214 When battery modules are connected in parallel, the most charged modules transfer charge to the least charged modules. The process of charge transfer is accompanied by the flow of balancing currents. The BMS Main X device detects modules with high balancing currents and generates “Current unbalance (CH)” (charge circuit) and “Current unbalance (DCH)” (discharge circuit) errors for them.
Admin 1.1 215
216 Protection against current unbalance of battery modules is configured in the section "Protections - Current unbalance":
217
Admin 8.4 218 [[image:Battery management systems.BMS Main 3X.3\. Configuration.3\.4 Protections.WebHome@1734090244843-403.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="116" width="800"]]
Admin 1.1 219
220 In this section:
221
222 * Enable – a flag to enable the protection;
223 * Maximum current – a maximum allowable self-balancing current of battery modules, A;
224 * Delay before setting the error;
225 * Delay before clearing the error;
Admin 8.2 226 * Check all the time (not only in the ‘Balancing’ state) – a flag to enable voltage check not only in “Balancing” state;
Admin 1.1 227 * Lock – a flag to block the error until the device is restarted.
228
229 As a result of the operation of the current unbalance protection the errors “Current unbalance (CH)” and “Current unbalance (DCH)” are generated. Conditions for generating the error:
230
Admin 8.2 231 * the current of the battery module is greater than the "Maximum current" value during the "Delay before setting the error" time.
Admin 1.1 232
233 Conditions for clearing the error:
234
Admin 8.2 235 * the current of the battery module is less than the "Maximum current" value during the "Delay before clearing the error" time.
Admin 1.1 236
Admin 8.4 237 (% class="box infomessage" %)
Admin 8.3 238 (((
Admin 8.4 239 If there is the “Current unbalance (CH)” or "Current unbalance (DCH)" error, **corresponding battery module opens its charging or discharging contactor**.
Admin 8.3 240 )))
Admin 1.1 241
Admin 8.2 242 === Charging current unbalance (in “Charging” state) ===
Admin 1.1 243
Admin 2.1 244 During battery charging, the currents of the battery modules may vary. The BMS Main X device detects modules whose charging currents are significantly different from the currents of other modules and generates the “Charging current unbalance” errors for them.
Admin 1.1 245
246 Protection against different charge currents is configured in the "Protections – Charging current unbalance" section:
247
248 [[image:1734356802715-364.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="75" width="600"]]
249
250 In this section:
251
252 * Enable – a flag to enable the protection;
253 * Delta current – maximum allowable charge current difference, A;
254 * Delay before setting the error;
255 * Delay before clearing the error;
256 * Lock – a flag to block the error until the device is restarted.
257
258 As a result of the operation of the protection the “Charging current unbalance” are generated. Conditions for generating the errors:
259
260 * battery module is not included in the largest group of modules whose charge currents differ from each other by no more than "Delta current" during the "Delay before setting the error" time.
261
262 Conditions for clearing the error:
263
264 * battery module is included in the largest group of modules with similar charge currents during the “Delay before clearing the error” time.
265
Admin 8.3 266 (% class="box infomessage" %)
267 (((
268 If there is the “Charging current unbalance” error, **corresponding battery module opens its charging contactor**.
269 )))
Admin 1.1 270
271 === Discharging current unbalance ===
272
Admin 2.1 273 During battery discharging, the currents of the battery modules may vary. The BMS Main X device detects modules whose discharging currents are significantly different from the currents of other modules and generates the “Discharging current unbalance” errors for them.
Admin 1.1 274
275 Protection against different discharge currents is configured in the "Protections – Discharging current unbalance" section:
276
277 [[image:1734356802717-812.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="75" width="600"]]
278
279 In this section:
280
281 * Enable – a flag to enable the protection;
282 * Delta current – maximum allowable discharge current difference, A;
283 * Delay before setting the error;
284 * Delay before clearing the error;
285 * Lock – a flag to block the error until the device is restarted.
286
287 As a result of the operation of the protection the “Discharging current unbalance” are generated. Conditions for generating the errors:
288
289 * battery module is not included in the largest group of modules whose discharge currents differ from each other by no more than "Delta current" during the "Delay before setting the error" time.
290
291 Conditions for clearing the error:
292
293 * battery module is included in the largest group of modules with similar discharge currents during the “Delay before clearing the error” time.
294
Admin 8.3 295 (% class="box infomessage" %)
296 (((
297 If there is the “Discharging current unbalance” error, **corresponding battery module opens its discharging contactor**.
298 )))
Admin 1.1 299
Admin 8.7 300 === High contactor temperature ===
Admin 8.4 301
302 === WDT reset ===
303
304 If the BMS firmware hangs, the watchdog timer resets the device. The BMS can detect that the device was reset and generates the “WDT reset” error.
305
306 To change the parameters of the watchdog protection, select the "Protections → WDT reset" section:
307
Admin 1.1 308 === Critical error ===
309
310 Parameters for generating the critical error are configured in the "Protections - Critical error" section:
311
312 [[image:1734356802719-477.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="69" width="600"]]
313
314 In this section:
315
316 * Enable – a flag to enable the protection;
317 * Delay before setting the error;
318 * Delay before clearing the error;
319 * Lock – a flag to block the error until the device is restarted.
320
321 The critical error flag is generated if at least one of the following errors persists during the "Delay before setting the error" time:
322
323 * «Battery cover»;
324 * «Insulation fault»;
325 * «CH contactor feedback error»;
326 * «DCH contactor feedback error»;
327 * «CH/DCH contactor feedback error»;
328 * «Module offline».
329
330 The critical error flag is cleared if there are no errors from the list above during the "Delay before clearing the error" time.
331
332 (% class="box warningmessage" %)
333 (((
334 **When the critical error flag is present, all battery contactors open.**
335 )))