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Changes for page 3.4 Protections

Last modified by Admin on 2025/11/10 11:45
From version 3.2
edited by Admin
on 2025/02/26 12:00
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To version 26.1
edited by Admin
on 2025/11/10 11:44
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63 63  * Delay before clearing the error, second;
64 64  * Lock – a flag to block the error until the device is restarted.
65 65  
66 +=== Discharge current limit ===
67 +
68 +The BMS Mini device can check if the discharging current exceeds the estimated limit based on the [[Discharge map>>doc:Battery management systems.BMS Mini S.3\. Configuration.3\.3 Control.WebHome||anchor="HDischargemap"]]. If current exceeds the calculated limit more than configured difference, "Current limit" error is generated.
69 +
70 +Current difference is separated to two regions by the threshold value. Maximum current in Region 1 is calculated by the absolute difference, in Region 2 – by the relative difference.
71 +
72 +To change the overcurrent protection of the battery, select the "Protections → Discharge current limit" section:
73 +
74 +[[image:1740571296344-411.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="151" width="800"]]
75 +
76 +In this section:
77 +
78 +* Enable – a flag to enable the protection;
79 +* Threshold to switch from Region 1 to Region 2 – a current value at which current excess calculation will be switched from absolute to relative difference, A;
80 +* Region 1: Current difference – a value of maximum absolute current difference, A;
81 +* Region 2: Current difference – a value of maximum relative current excess, A;
82 +* Delay before setting the error, millisecond;
83 +* Delay before clearing the error, second;
84 +* Lock – a flag to block the error until the device is restarted.
85 +
66 66  === Undervoltage ===
67 67  
68 68  The BMS Mini device implements battery protection from too low voltage on the cells.
... ... @@ -69,7 +69,7 @@
69 69  
70 70  To change the battery protection parameters from low voltage on the cells, select the "Protections → Undervoltage" section:
71 71  
72 -[[image:1733748033237-837.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="127" width="800"]]
92 +[[image:1740571345293-460.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="138" width="800"]]
73 73  
74 74  In this section:
75 75  
... ... @@ -76,6 +76,7 @@
76 76  * Enable – a flag to enable the protection;
77 77  * Minimum cell voltage, V;
78 78  * Tolerant cell voltage, V;
99 +* Check the open circuit voltage instead of the actual voltage – a flag to use the U,,ocv,, (corrected due to current and cell resistance) cell voltage instead of measured value;
79 79  * Delay before setting the error, millisecond;
80 80  * Delay before clearing the error, second;
81 81  * Lock – a flag to block the error until the device is restarted.
... ... @@ -96,7 +96,7 @@
96 96  
97 97  To change the battery protection parameters from high voltage on the cells, select the "Protections → Overvoltage" section:
98 98  
99 -[[image:1733748033238-995.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="138" width="800"]]
120 +[[image:1740571383842-536.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="147" width="800"]]
100 100  
101 101  In this section:
102 102  
... ... @@ -103,9 +103,9 @@
103 103  * Enable – a flag to enable the protection;
104 104  * Maximum cell voltage, V;
105 105  * Tolerant cell voltage, V;
127 +* Check the open circuit voltage instead of the actual voltage – a flag to use the U,,ocv,, (corrected due to current and cell resistance) cell voltage instead of measured value;
106 106  * Delay before setting the error, millisecond;
107 107  * Delay before clearing the error, second;
108 -* Switch off the discharging contactor on error – a flag to open the discharging contactor when the "Overvoltage" error is generated;
109 109  * Lock – a flag to block the error until the device is restarted.
110 110  
111 111  As a result of the operation of the battery protection from high voltage, the "Overvoltage" error is generated.
... ... @@ -118,6 +118,33 @@
118 118  
119 119  * the maximum voltage among all cells of the battery is less than the “Tolerant cell voltage” value for the “Delay before clearing the error” time.
120 120  
142 +=== Cell imbalance ===
143 +
144 +The BMS Mini S device implements battery protection from too much cell imbalance. If balancing algorithm is not enough to compensate battery imbalance, then imbalance protection generates an error when imbalance is above estimated threshold.
145 +
146 +To change the battery protection parameters from cell imbalance, select the "Protections → Cell imbalance" section:
147 +
148 +[[image:1762772978976-565.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="145" width="800"]]
149 +
150 +In this section:
151 +
152 +* Enable – a flag to enable the protection;
153 +* Maximum cell imbalance, V;
154 +* Tolerant cell imbalance, V;
155 +* Delay before setting the error, millisecond;
156 +* Delay before clearing the error, second;
157 +* Lock – a flag to block the error until the device is restarted.
158 +
159 +As a result of the operation of the battery protection from cell imbalance, the "Cell imbalance” error is generated.
160 +
161 +Error generation conditions:
162 +
163 +* the voltage difference between the most charged cell and the least charged cell is more than the “Maximum cell imbalance” value for the “Delay before setting the error” time.
164 +
165 +Conditions for removing the error:
166 +
167 +* the voltage difference between the most charged cell and the least charged cell is less than the “Tolerant cell imbalance” value for the “Delay before clearing the error” time.
168 +
121 121  === Low temperature ===
122 122  
123 123  The BMS Mini device implements battery protection from too low temperature.
... ... @@ -261,6 +261,35 @@
261 261  If there is the "Cell count error", the **“Critical error” **is generated.
262 262  )))
263 263  
312 +=== Temperature sensor count ===
313 +
314 +To change the protection parameters from the mismatch of the number of temperature sensors to the set value, select the "Protections → Temperature sensor count" section:
315 +
316 +[[image:1762773073782-768.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="130" width="800"]]
317 +
318 +In this section:
319 +
320 +* Enable – a flag to enable the protection;
321 +* Number of cells – a number of temperature sensors connected to the BMS;
322 +* Delay before setting the error, millisecond;
323 +* Delay before clearing the error, second;
324 +* Lock – a flag to block the error until the device is restarted.
325 +
326 +As a result of the operation of the protection from the mismatch of the number of cells, the "T-sensor count error" is generated.
327 +
328 +Error generation conditions:
329 +
330 +* the number of temperature sensors connected to the BMS is **not equal** to the “Number of temperature sensors” value during the “Delay before setting the error” time.
331 +
332 +Conditions for removing the error:
333 +
334 +* the number of temperature sensors connected to the BMS is **equal** to the “Number of temperature sensors” value during the “Delay before clearing the error” time.
335 +
336 +(% class="box warningmessage" %)
337 +(((
338 +If there is the "T-sensor count error", the **“Critical error” **is generated**.**
339 +)))
340 +
264 264  === Short circuit ===
265 265  
266 266  The BMS Mini device implements a protection of power circuits (contactors, power wires) against overheating caused by the flow of high current for a long time.
... ... @@ -356,6 +356,24 @@
356 356  If there is the “Current sensor error”, the **“Critical error” **is generated.
357 357  )))
358 358  
436 +=== MOSFET ===
437 +
438 +BMS Mini S device checks the status of MOSFET switches that are used to control the contactors. To change the parameters of the MOSFET switch protection, select the "Protections → MOSFET " section:
439 +
440 +[[image:1762773566548-852.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="105" width="800"]]
441 +
442 +In this section:
443 +
444 +* Delay before clearing the error, second;
445 +* Lock – a flag to block the error until the device is restarted.
446 +
447 +The “MOSFET error” occurs when the device detects a shortage in contactor coil control circuit or an overheating of the MOSFET switch. Error is removed when the temperature of MOSFET switch is normal during “Delay before clearing the error” time.
448 +
449 +(% class="box warningmessage" %)
450 +(((
451 +If there is the "MOSFET error", the **“Critical error” **is generated.
452 +)))
453 +
359 359  === Charge contactor cycles ===
360 360  
361 361  The BMS Mini device protects the charging contactor against frequent switching.
... ... @@ -372,7 +372,6 @@
372 372  * Delay before setting the error, millisecond;
373 373  * Delay before clearing the error, second;
374 374  * Lock – a flag to block the error until the device is restarted.
375 -* Number of cycles – a number of the charging contactor switchings made during battery operation.
376 376  
377 377  If there is the high switching frequency of the charging contactor, the “CH contactor cycles error” is generated.
378 378  
... ... @@ -384,13 +384,13 @@
384 384  
385 385  * the “Delay before clearing the error” time has passed since the error was generated.
386 386  
387 -=== Discharge contactor cycles protection ===
481 +=== Discharge contactor cycles ===
388 388  
389 389  The BMS Mini device protects the discharging contactor against frequent switching.
390 390  
391 391  To change the protection parameters against high frequency switching of the discharging contactor, select the "Protections → Discharging contactor cycles" section:
392 392  
393 -[[image:1733748068420-615.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="139" width="800"]]
487 +[[image:1740571600741-802.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="128" width="800"]]
394 394  
395 395  In this section:
396 396  
... ... @@ -400,7 +400,6 @@
400 400  * Delay before setting the error, millisecond;
401 401  * Delay before clearing the error, second;
402 402  * Lock – a flag to block the error until the device is restarted.
403 -* Number of cycles – a number of the charging contactor switchings made during battery operation.
404 404  
405 405  If there is the high switching frequency of the discharging contactor, the “DCH contactor cycles error” is generated.
406 406  
... ... @@ -501,6 +501,11 @@
501 501  
502 502  * charging and discharging contactors are open, but the “Charging current present” or “Discharging current present” signal is set.
503 503  
597 +(% class="box warningmessage" %)
598 +(((
599 +If there is the "Stuck contactor" error, the **“Critical error” **is generated.
600 +)))
601 +
504 504  === Contactor feedback ===
505 505  
506 506  The BMS Mini 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 corresponding contactor feedback pin on X1 header.
... ... @@ -520,6 +520,11 @@
520 520  
521 521  * a command for charging, precharge, discharging, charging/discharging or main contactor not matches its feedback value.
522 522  
621 +(% class="box warningmessage" %)
622 +(((
623 +If there is the "Contactor feedback" error, the **“Critical error” **is generated.
624 +)))
625 +
523 523  === Insulation ===
524 524  
525 525  The BMS Mini device can detect a signal from an external insulation monitoring device (such as Bender IR155) to monitor the insulation quality.
... ... @@ -526,11 +526,15 @@
526 526  
527 527  To change the insulation monitoring parameters, select the "Protections → Insulation" section:
528 528  
529 -[[image:1733748083469-478.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="102" width="800"]]
632 +[[image:1740573733492-485.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="119" width="800"]]
530 530  
531 531  In this section:
532 532  
533 533  * Enable – a flag to enable the protection;
637 +* Checking algorithm – isolation checking mode:
638 +** Always on – check is always performed;
639 +** On charging – check is performed only if “Charger connected” or “Charge request” is set;
640 +** Except charging - check is performed only if “Charger connected” and “Charge request” are cleared;
534 534  * Delay before setting the error, second;
535 535  * Delay before clearing the error, second;
536 536  * Lock – a flag to block the error until the device is restarted.
... ... @@ -537,6 +537,11 @@
537 537  
538 538  Error is set if corresponding discrete input is set up and it receives logical zero.
539 539  
647 +(% class="box warningmessage" %)
648 +(((
649 +If there is the "Insulation" error, the **“Critical error” **is generated.
650 +)))
651 +
540 540  === Critical error ===
541 541  
542 542  To change the critical error parameters, select the "Protections → Critical error" section:
... ... @@ -550,21 +550,29 @@
550 550  * Delay before clearing the error, second;
551 551  * Lock – a flag to block the error until the device is restarted.
552 552  
553 -The critical error flag is generated if at least one of the following errors is generated during the “Delay before setting the error” time:
665 +The "Critical error" signal is generated if at least one of the critical errors (see [[Errors>>doc:Battery management systems.Additional information.1\. Battery controllers\: signals and errors.WebHome||anchor="HErrors"]]) is generated during the “Delay before setting the error” time.
554 554  
555 -* “Battery cover error”;
556 -* “Cell monitor offline”;
557 -* “Cell count error”;
558 -* “ADC error”;
559 -* “Current sensor error”;
560 -* “Shunt offline”;
561 -* “Shunt error”;
562 -* “No temp. sensors”;
563 -* “Temp. sensor is shorted”;
564 -* “Settings error”;
565 -* “WDT reset”;
566 -* “Stuck contactor”;
567 -* “Contactor feedback error”;
568 -* “Insulation fault”.
569 -
570 570  The “Critical error” is cleared if there are no errors from the list above during the “Delay before clearing the error” time.
668 +
669 +=== General error ===
670 +
671 +To change the general error parameters, select the "Protections → Critical error" section:
672 +
673 +[[image:1740573914327-561.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="129" width="800"]]
674 +
675 +In this section:
676 +
677 +* Enable – a flag to enable the protection;
678 +* Delay before setting the error, millisecond;
679 +* Delay before clearing the error, second;
680 +* Lock – a flag to block the error until the device is restarted;
681 +* Errors 1, 2 to set the "Critical error" – bitfields to enable check of corresponding errors.
682 +
683 +The “General error” is generated if at least one of the enabled errors is generated during the “Delay before setting the error” time.
684 +
685 +The “General error” is cleared if there are no errors from the enabled errors during the “Delay before clearing the error” time.
686 +
687 +(% class="box warningmessage" %)
688 +(((
689 +The state of the “General error” can be assigned to a discrete output or to a power switch.
690 +)))
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