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Wiki source code of 3.4 Protections

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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
7 (% class="wikigeneratedid" %)
8 The BMS Main 3X device continuously monitors the state of the modules, the external environment and, when detecting abnormalities, protects the battery and system components from damage.
9
10 (% class="box errormessage" %)
11 (((
12 **Attention!**
13 Behavior of contactors at different errors is configured in **corresponding contactor settings**!
14 )))
15
16 === Overcurrent ===
17
18 The BMS Main 3X device performs the overcurrent protection depending on current sensor values.
19
20 To change the overcurrent protection of the battery, select the "Protections → Overcurrent" section:
21
22 [[image:1734090216098-684.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="122" width="600"]]
23
24 In this section:
25
26 * Enable – a flag to enable the protection;
27 * Maximum charging current, A;
28 * Tolerant charging current, A;
29 * Maximum discharging current, A;
30 * Tolerant discharging current, A;
31 * Delay before setting the error, millisecond;
32 * Delay before clearing the error, second;
33 * Lock – a flag to block the error until the device is restarted.
34
35 As a result of operation of the overcurrent protection, the "Overcurrent" error is generated.
36
37 Error generation conditions:
38
39 * the current is positive (charging), and its modulo value is greater than the “Maximum charging current” value for the “Delay before setting the error” time;
40 * the current is negative (discharging), and its modulo value is greater than the “Maximum discharging current” value for the “Delay before setting the error” time.
41
42 Conditions for removing the error:
43
44 * the current is positive (charging) or zero, and its modulo value is less than the “Tolerant charging current” value for the “Delay before clearing the error” time;
45 * the current is negative (discharging) or zero, and its modulo value is less than the “Tolerant discharging current” value for the “Delay before clearing the error” time.
46
47 === Charging current limit ===
48
49 The BMS Main 3X device protects the battery from charging current higher than estimated current limit.
50
51 To configure parameters of the charge current limit, select the "Protections → Charge current limit" section:
52
53 [[image:1734090216101-986.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="93" width="600"]]
54
55 In this section:
56
57 * Enable – a flag to enable the protection;
58 * Threshold to switch from Region 1 to Region 2 – a threshold current value, dividing regions 1 and 2 with their error generation conditions, A;
59 * 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;
60 * 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), %;
61 * Delay before setting the error, millisecond;
62 * Delay before clearing the error, second;
63 * Lock – a flag to block the error until the device is restarted.
64
65 As a result of the operation of the charging current limit protection, the “Current limit error (CH)” is generated.
66
67 Error generation conditions:
68
69 * 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;
70 * 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.
71
72 Error is cleared if conditions for generating an error do not apply during the “Delay before clearing the error” time.
73
74 === Discharging current limit ===
75
76 The BMS Main 3X device protects the battery from discharging current higher than estimated current limit.
77
78 To configure parameters of the charge current limit, select the "Protections → Discharge current limit " section:
79
80 [[image:1734090216102-567.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="96" width="600"]]
81
82 In this section:
83
84 * Enable – a flag to enable the protection;
85 * Threshold to switch from Region 1 to Region 2 – a threshold current value, dividing regions 1 and 2 with their error generation conditions, A;
86 * 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;
87 * 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), %;
88 * Delay before setting the error, millisecond;
89 * Delay before clearing the error, second;
90 * Lock – a flag to block the error until the device is restarted.
91
92 As a result of the operation of the charging current limit protection, the “Current limit error (DCH)” is generated.
93
94 Error generation conditions:
95
96 * 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;
97 * 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.
98
99 Error is cleared if conditions for generating an error do not apply during the “Delay before clearing the error” time.
100
101 === Battery cover ===
102
103 The BMS Main 3X device detects the opening of the battery cover and performs a protective opening of the contactors.
104
105 Battery cover protection is configured in the "Protections → Battery cover" section:
106
107 [[image:1734090216103-510.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="89" width="600"]]
108
109 In this section:
110
111 * Enable – a flag to enable the protection;
112 * Delay before setting the error;
113 * Delay before clearing the error;
114 * Lock – a flag to block the error until the device is restarted.
115
116 As a result of the protection against opening the battery cover, the “Battery cover” error is generated. Conditions for generating the error:
117
118 * presence of the “Battery cover” signal during the “Delay before setting the error” time.
119
120 Conditions for clearing the error:
121
122 * no “Battery cover” signal during the “Delay before clearing the error” time.
123
124 (% class="box warningmessage" %)
125 (((
126 If there is the "Battery cover" error, **“Critical error” is generated**.
127 )))
128
129 === High humidity ===
130
131 The BMS Main 3X can detect that the battery is operating in high humidity conditions.
132
133 To change the detection parameters, select the "Protections → High humidity" section:
134
135 [[image:1734090229154-450.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="102" width="600"]]
136
137 In this section:
138
139 * Enable – a flag to enable the detection;
140 * Maximum humidity, RH%;
141 * Tolerant humidity, RH%;
142 * Delay before setting the error, second;
143 * Delay before clearing the error, second;
144 * Lock the error until the device is reset.
145
146 As a result of the operation of the battery protection from high humidity, the "High humidity" error is generated.
147
148 Error generation conditions:
149
150 * the measured humidity is greater than “Maximum humidity” during the “Delay before setting the error” time.
151
152 Conditions for removing the error:
153
154 * the measured humidity is less than the “Tolerant humidity” during the “Delay before clearing the error” time.
155
156 === Water ===
157
158 The BMS Main 3X can protect the battery from working in very high humidity conditions.
159
160 To change the protection parameters, select the "Protections → Water" section:
161
162 [[image:1734090229157-150.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="103" width="600"]]
163
164 In this section:
165
166 * Enable – a flag to enable the protection;
167 * Maximum humidity, RH%;
168 * Tolerant humidity, RH%;
169 * Delay before setting the error, second;
170 * Delay before clearing the error, second;
171 * Lock – lock the error until the device is reset.
172
173 As a result of the operation of the battery protection from water, the "Water" error is generated.
174
175 Error generation conditions:
176
177 * the measured humidity is greater than the “Maximum humidity” value during the “Delay before setting the error” time.
178
179 Conditions for removing the error:
180
181 * the measured humidity is less than the “Tolerant humidity” value during the “Delay before clearing the error” time.
182
183 (% class="box warningmessage" %)
184 (((
185 If there is the “Water” error, the **“Critical error” is generated**.
186 )))
187
188 === Insulation ===
189
190 The BMS Main 3X device can detect a physical signal or CAN bus message from an external insulation monitoring device (such as Bender IR155, iso165C, BMD IMD) to monitor the insulation quality.
191
192 To change the insulation monitoring parameters, select the "Protections → Insulation" section:
193
194 [[image:1734090229158-240.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="86" width="600"]]
195
196 In this section:
197
198 * Enable – a flag to enable the protection;
199 * Checking algorithm – isolation checking mode:
200 ** Always on – check is always performed;
201 ** On charging – check is performed only if the “Charge request” is set;
202 ** Except charging - check is performed only if the “Charge request” is cleared;
203 * Delay before setting the error, second;
204 * Delay before clearing the error, second;
205 * Lock – a flag to block the error until the device is restarted.
206
207 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.
208
209 (% class="box warningmessage" %)
210 (((
211 If there is the “Insulation fault”, **“Critical error” is generated.**
212 )))
213
214 === HVIL ===
215
216 The BMS Main 3X allows to control the high voltage interlock loop by applying current to a testing loop and monitoring the difference between the measured current and the required value.
217
218 To change the HVIL measurement parameters, select the "Protections → HVIL" section:
219
220 [[image:1734090229159-214.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="95" width="600"]]
221
222 In this section:
223
224 * Enable – a flag to enable the protection;
225 * Source is OFF: Lower current limit – a lower current limit in high-voltage interrupt loop at disabled source, A;
226 * Source is OFF: Upper current limit – an upper current limit in high-voltage interrupt loop at disabled source, A;
227 * Source is ON: Lower current limit – a lower current limit in high-voltage interrupt loop at enabled source, A;
228 * Source is ON: Upper current limit – an upper current limit in high-voltage interrupt loop at enabled source, A;
229 * Lock – a flag to block the error until the device is restarted.
230
231 As a result of the operation of the HVIL protection, the "HVIL error” is generated.
232
233 Error generation conditions:
234
235 * the measured current is outside the range from “Source is OFF: Lower current limit” to “Source is OFF: Upper current limit” while disabled source or outside the range from “Source is ON: Lower current limit” to “Source is ON: Upper current limit” while enabled source during the “Delay before setting the error” time.
236
237 Conditions for removing the error:
238
239 * the measured current is inside the range from “Source is OFF: Lower current limit” to “Source is OFF: Upper current limit” while disabled source and inside the range from “Source is ON: Lower current limit” to “Source is ON: Upper current limit” while enabled source during the «Delay before clearing the error» time.
240
241 (% class="box warningmessage" %)
242 (((
243 If there is the “HVIL error”, **“Critical error” is generated.**
244 )))
245
246 === Short circuit ===
247
248 The BMS Main 3X device implements the protection of power circuits (contactors, power wires) against overheating caused by the flow of high current for a long time.
249
250 To change the protection parameters from short circuit, select the "Protections → Short circuit" section:
251
252 [[image:1734090229160-206.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="151" width="600"]]
253
254 In this section:
255
256 * Level 1, 2, 3 – three protection levels. The following parameters are configured at each level:
257 ** Enable – a flag to enable the protection;
258 ** Maximum current, A;
259 ** Delay before setting the error, second;
260 * Delay before clearing the error, second;
261 * Lock – a flag to block the error until the device is restarted.
262
263 If there is a short circuit, the "Short circuit" error is generated.
264
265 Error generation conditions:
266
267 * at any of the three protection levels, the current modulo is greater than the “Maximum current” value during the “Delay before setting the error” time.
268
269 Conditions for removing the error:
270
271 * the current modulo is lower than the “Maximum current” values for all three protection levels during the “Delay before setting the error” time.
272
273 === Current sensor ===
274
275 The BMS Main 3X device checks the current sensor connection circuits. The circuits are checked for breakage and short-circuit to the +5 V supply line.
276
277 To change the test parameters of the current sensor connection circuits, select the "Protections → Current sensor" section:
278
279 [[image:1734090229162-401.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="105" width="600"]]
280
281 In this section:
282
283 * Enable – a flag to enable the protection;
284 * Maximum voltage, V;
285 * Minimum voltage, V;
286 * Voltage hysteresis – a hysteresis value to clear the error, V;
287 * Delay before setting the error, second;
288 * Delay before clearing the error, second;
289 * Lock – a flag to block the error until the device is restarted.
290
291 If there is an open or short circuit connection of a current sensor, the "Current sensor error" is generated.
292
293 Error generation conditions:
294
295 * the voltage in the signal line or reference line of the current sensor is greater than the “Maximum voltage” value during the “Delay before setting the error” time;
296 * the voltage in the signal line or reference line of the current sensor is less than the “Minimum voltage” value during the “Delay before setting the error” time.
297
298 Conditions for removing the error:
299
300 * the voltage in the signal line or reference line of the current sensor is in range from (Minimum voltage + Voltage hysteresis) to (Maximum voltage - Voltage hysteresis) during the “Delay before clearing the error” time.
301
302 (% class="box warningmessage" %)
303 (((
304 If there is the “Current sensor error”, **“Critical error” is generated.**
305 )))
306
307 === Power switch ===
308
309 The BMS Main 3X device checks the status of power switches that are used to control the contactors. To change the parameters of the power switch protection, select the "Protections → Power switch" section:
310
311 [[image:1734090229164-117.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="78" width="600"]]
312
313 In this section:
314
315 * Delay before clearing the error, second;
316 * Lock – a flag to block the error until the device is restarted.
317
318 The “Power switch error” occurs when the device detects a shortage in contactor coil control circuit or an overheating of the power switch. Error is removed when the temperature of power switch is normal during “Delay before clearing the error” time.
319
320 (% class="box warningmessage" %)
321 (((
322 If there is the "Power switch error", **“Critical error” is generated.**
323 )))
324
325 === Power fault ===
326
327 BMS Main 3X device checks the status of CAN2, CAN3, RS-485-2 and Current sensors power supply.
328
329 (% class="box infomessage" %)
330 (((
331 **Note:** this error can be configured only under** "Service" account**.
332 )))
333
334 To change the parameters of the power fault error, select the "Protections → Power fault" section:
335
336 [[image:1739293273199-250.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="85" width="600"]]
337
338 In this section:
339
340 * Delay before clearing the error, second;
341 * Delay before setting the error, millisecond;
342 * Time to keep power off, millisecond;
343 * Delay before clearing the error, millisecond;
344 * Lock – a flag to block the error until the device is restarted.
345
346 The “Power fault” occurs when the device detects a shortage or high power consumption in power supplies mentioned above. Error is removed when the power consumption is normal during “Delay before clearing the error” time.
347
348 (% class="box warningmessage" %)
349 (((
350 If there is the "Power fault", the **“Critical error” **is generated.
351 )))
352
353 === Stuck contactor ===
354
355 The BMS Main 3X device protects contactors against sticking.
356
357 To change the protection parameters against sticking, select the "Protections → Stuck contactor" section:
358
359 [[image:1734090244840-678.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="92" width="600"]]
360
361 In this section:
362
363 * Enable – a flag to enable the protection;
364 * Delay before setting the error, millisecond;
365 * Delay before clearing the error, second;
366 * Check voltage – a flag to enable checking of voltage before and after contactors to detect the fact of contactor sticking;
367 * Abnormal voltage difference – the difference of voltages before and after contactors at which BMS indicates and error;
368 * Lock – a flag to block the error until the device is restarted.
369
370 If there is a stuck contactor, the “Stuck contactor” error is generated. Error generation conditions:
371
372 * The charging and discharging contactors are open, but the “Charging current present” or “Discharging current present” signal is set or (if “Check voltage” flag is set) “Charging/Discharging” contactor is open and voltage difference before and after contactors is lower than “Abnormal voltage difference”.
373
374 === Contactor feedback ===
375
376 The BMS Main 3X device can receive feedback signals from contactors and detect discrepancy between the control value and the feedback signal. To enable specific contactor protection, the feedback signal must be connected to the corresponding contactor feedback pin on the X3 header.
377
378 To change the contactor feedback check parameters, select the "Protections → Contactor feedback" section:
379
380 [[image:1734090244841-701.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="74" width="600"]]
381
382 In this section:
383
384 * Enable – a flag to enable the protection;
385 * Delay before setting the error, millisecond;
386 * Delay before clearing the error, second;
387 * Lock – a flag to block the error until the device is restarted.
388
389 If there is a discrepancy at any contactor, the corresponding contactor feedback error is generated. Error generation conditions:
390
391 * a command to the charging, precharging, discharging, charging/discharging or main contactor does not match its feedback value.
392
393 (% class="box warningmessage" %)
394 (((
395 If there is a contactor feedback error, **“Critical error” is generated.**
396 )))
397
398 === Modules offline ===
399
400 The BMS Main 3X device detects the loss of communication with the battery modules and performs a protective opening of the contactors.
401
402 Protection against loss of communication with battery modules is configured in the "Protections - Module offline" section:
403
404 [[image:1734090244841-635.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="86" width="600"]]
405
406 In this section:
407
408 * Enable – a flag to enable the protection;
409 * Number of offline modules to set the error;
410 * Delay before setting the error, second;
411 * Delay before clearing the error, second;
412 * Lock – lock the error until the device is reset.
413
414 As a result of the protection from loss of communication with battery modules, the "Module offline" error is generated.
415
416 Error generation conditions:
417
418 * 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.
419
420 Conditions for removing the error:
421
422 * 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.
423
424 (% class="box warningmessage" %)
425 (((
426 If there is the "Module offline" error, **“Critical error” is generated.**
427 )))
428
429 === Voltage unbalance (in any state) ===
430
431 Before closing the contactors for charging and discharging battery modules, the BMS Main 3X 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.
432
433 Protection against voltage unbalance of battery modules is configured in the section "Protections - Voltage unbalance (in any state)":
434
435 [[image:Battery management systems.BMS Main X.3\. Configuration.3\.4 Protections.WebHome@1740754732291-420.png||alt="I1740754732291-420.png" data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="95" width="600"]]
436
437 In this section:
438
439 * Enable – a flag to enable the protection;
440 * Delta voltage – maximum allowable voltage difference of battery modules, V;
441 * Use the open circuit voltage to detect the error – a flag to use the U,,ocv,, (corrected due to current and module resistance) module voltage;
442 * Delay before setting the error;
443 * Delay before clearing the error;
444 * Set the 'Voltage unbalance' error for the modules that are not ready to charge/discharge;
445 * Lock – a flag to block the error until the device is restarted.
446
447 As a result of the operation of the voltage unbalance protection the errors “Voltage unbalance (CH)” and “Voltage unbalance (DCH)” are generated.
448
449 Conditions for generating the error:
450
451 * 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;
452 * module is not ready to charge or discharge;
453
454 Conditions for clearing the error:
455
456 * battery module is in the largest group of balanced modules during the "Delay before clearing the error" time;
457 * module is ready to charge or discharge.
458
459 (% class="box infomessage" %)
460 (((
461 If there is the “Voltage unbalance (CH)” or “Voltage unbalance (DCH)” error, **corresponding battery module opens its charging or discharging contactor**.
462 )))
463
464 === Current unbalance (in “Balancing” state) ===
465
466 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 3X device detects modules with high balancing currents and generates “Current unbalance (CH)” (charge circuit) and “Current unbalance (DCH)” (discharge circuit) errors for them.
467
468 Protection against current unbalance of battery modules is configured in the section "Protections - Current unbalance (in “Balancing” state):
469
470 [[image:1734090244843-403.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="87" width="600"]]
471
472 In this section:
473
474 * Enable – a flag to enable the protection;
475 * Maximum current – a maximum allowable self-balancing current of battery modules, A;
476 * Delay before setting the error;
477 * Delay before clearing the error;
478 * Check all the time (not only in the ‘Balancing’ state) – a flag to enable voltage check not only in “Balancing” state;
479 * Lock – a flag to block the error until the device is restarted.
480
481 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:
482
483 * the current of the battery module is greater than the "Maximum current" value during the "Delay before setting the error" time.
484
485 Conditions for clearing the error:
486
487 * the current of the battery module is less than the "Maximum current" value during the "Delay before clearing the error" time.
488
489 (% class="box infomessage" %)
490 (((
491 If there is the “Current unbalance (CH)” or "Current unbalance (DCH)" error, **corresponding battery module opens its charging or discharging contactor**.
492 )))
493
494 === Charging current unbalance (in “Charging” state) ===
495
496 During battery charge, the currents of the battery modules may vary. The BMS Main 3X device detects modules whose charging currents are significantly different from the currents of other modules and generates the “Charging current unbalance” errors for them.
497
498 Protection against different charge currents is configured in the "Protections – Charging current unbalance (in “Charging” state)" section:
499
500 [[image:1734090244844-431.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="80" width="600"]]
501
502 In this section:
503
504 * Enable – a flag to enable the protection;
505 * Delta current – maximum allowable charge current difference, A;
506 * Delay before setting the error;
507 * Delay before clearing the error;
508 * Lock – a flag to block the error until the device is restarted.
509
510 As a result of the operation of the protection the “Charging current unbalance” are generated. Conditions for generating the errors:
511
512 * the 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.
513
514 Conditions for clearing the error:
515
516 * the battery module is included in the largest group of modules with similar charge currents during the “Delay before clearing the error” time.
517
518 (% class="box infomessage" %)
519 (((
520 If there is the “Charging current unbalance” error, **corresponding battery module opens its charging contactor**.
521 )))
522
523 === Discharging current unbalance (in “Discharging” state) ===
524
525 During battery discharge, the currents of the battery modules may vary. The BMS Main 3X device detects modules whose discharging currents are significantly different from the currents of other modules and generates the “Discharging current unbalance” errors for them.
526
527 Protection against different discharge currents is configured in the "Protections – Discharging current unbalance (in “Discharging” state)" section:
528
529 [[image:1734090244844-192.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="79" width="600"]]
530
531 In this section:
532
533 * Enable – a flag to enable the protection;
534 * Delta current – maximum allowable discharge current difference, A;
535 * Delay before setting the error;
536 * Delay before clearing the error;
537 * Lock – a flag to block the error until the device is restarted.
538
539 As a result of the operation of the protection the “Discharging current unbalance” are generated. Conditions for generating the errors:
540
541 * the 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.
542
543 Conditions for clearing the error:
544
545 * the battery module is included in the largest group of modules with similar discharge currents during the “Delay before clearing the error” time.
546
547 (% class="box infomessage" %)
548 (((
549 If there is the “Discharging current unbalance” error, **corresponding battery module opens its discharging contactor**.
550 )))
551
552 === WDT reset ===
553
554 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.
555
556 To change the parameters of the watchdog protection, select the "Protections → WDT reset" section:
557
558 [[image:1734090244845-157.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="70" width="600"]]
559
560 In this section:
561
562 * Enable – a flag to enable the protection;
563 * Delay before clearing the error, second;
564 * Lock – a flag to block the error until the device is restarted.
565
566 Conditions for removing the error:
567
568 * the “Delay before clearing the error” time has passed from the device startup.
569
570 (% class="box warningmessage" %)
571 (((
572 If there is the "WDT reset" error, **“Critical error” is generated.**
573 )))
574
575 === Critical error ===
576
577 Some of the errors are system critical. A separate signal named "Critical error" indicates a system misbehaviour.
578
579 To change the critical error parameters, select the "Protections → Critical error" section:
580
581 [[image:1742475897157-411.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="88" width="600"]]
582
583 In this section:
584
585 * Enable – a flag to enable the protection;
586 * Module errors 1, 2 to set the critical error – bitfields with module errors that generate critical error when appear on any module;
587 * Delay before setting the error, millisecond;
588 * Delay before clearing the error, second;
589 * Lock – a flag to block the error until the device is restarted.
590
591 The “Critical error” is generated if at least one of the critical errors (see [[Errors>>doc:Battery management systems.Additional information.2\. Strings controllers\: signals and errors.WebHome||anchor="HErrors"]]) is generated during the “Delay before setting the error” time:
592
593 The “Critical error” is cleared if there are no errors from the list above during the “Delay before clearing the error” time.