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Changes for page 3.3 Control

Last modified by Admin on 2025/04/09 12:14
From version 1.2
edited by Admin
on 2024/12/04 14:29
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To version 1.3
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1 +1.
2 +11.
3 +111. Common settings
4 +
5 +To change the common BMS settings, select the "Control → Common settings" section:
6 +
7 +[[image:1733322611547-671.png]]
8 +
9 +In this section:
10 +
11 +* Cell capacity – nominal capacity of cells, Ah;
12 +* Cell resistance – nominal (maximum) internal resistance of the cells, Ohm;
13 +* Relax time (after charging) – a relaxation time after charging, second;
14 +* Relax time (atfer discharging) – a relaxation time after discharging, second;
15 +* Number of cycles – a number of charge-discharge cycles;
16 +* Reset parameters – a command to reset cells state of charge, capacity, and resistance.
17 +
18 +The values “Capacity”, “Resistance”, “Cycles” are used to calculate the SOC of cells and the battery.
19 +
20 +The values of “Relax time” are used to determine the state of the battery. If the battery is in a state of relaxation, the system recalculates the voltage on the cells to the state of charge of the battery.
21 +
22 +The “Reset parameters” will reset:
23 +
24 +* state of charge (new cell SOC values will be calculated based on cell voltage and “Uocv (open-circuit voltage) table”: in the “Control → SOC estimation” section);
25 +* cell resistance to “Cell resistance” value;
26 +* battery capacity to “Cell capacity” value.
27 +
28 +The “Reset parameters” command is used for starting-up and adjustment of the battery.
29 +
30 +
31 +1.
32 +11.
33 +111. SOC estimation
34 +
35 +The BMS Main 3 device calculates the state of charge of the battery (SOC) using two algorithms:
36 +
37 +* by open circuit voltage;
38 +* by voltage and current.
39 +
40 +It is recommended to use the algorithm of calculation of SOC by voltage and current.
41 +
42 +To change the estimation algorithm for calculating the battery SOC, select the "Control → SOC estimation → Algorithm" section:
43 +
44 +[[image:1733322611549-423.png]]
45 +
46 +The following estimation algorithms supported:
47 +
48 +* Voltage – by open circuit voltage;
49 +* Current and voltage (simplified) – recommended for LFP cells;
50 +* Current and voltage (enhanced) – recommended for NMC cells.
51 +
52 +The **“Voltage”** SOC calculation algorithm calculates cells SOC based on the tabular dependence Uocv = Uocv(SOC, t °C).
53 +
54 +The **“Current and voltage (simplified)”** SOC calculation algorithm works as follows:
55 +
56 +* if I = 0, the battery is in the state of relaxation and the cell voltage Uocv is outside the [U,,ocv[point 1],,; U,,ocv[point 2],,], the SOC calculation is based on the tabular dependency Uocv = Uocv(SOC, t °C);
57 +* in any other cases, the SOC value is proportional to the charge (coulomb) passed through the battery (current time integral).
58 +
59 +The **“Current and voltage (enhanced)” **SOC calculation algorithm differs from the simplified algorithm by online correction of the effective capacity. When using this algorithm, it is necessary to fine tune the tabular dependence Uocv = Uocv (SOC, t °C).
60 +
61 +To change the algorithm for calculating the Final SOC, select the "Control → SOC estimation → Final SOC" section:
62 +
63 +[[image:1733322611551-852.png]]
64 +
65 +The following calculation methods are supported (“Final SOC”):
66 +
67 +* Minimal SOC – the battery SOC is assumed to be the minimum SOC among the cells;
68 +* Average SOC – the battery SOC is taken equal to the arithmetic average of the cell SOC;
69 +* Min-Max SOC – the battery SOC is taken based on the minimum and maximum SOC of the cells (recommended method).
70 +
71 +Other parameters:
72 +
73 +* Scale the final SOC – a flag to scale the battery SOC by the following values;
74 +* SOC corresponding to 0% – the battery SOC that sets to be 0%;
75 +* SOC corresponding to 100% – the battery SOC that sets to be 100%.
76 +* Uocv (open-circuit voltage) table – the dependence of the cell open circuit voltage Uocv on SOC and the cell temperature (selected for specific batteries);
77 +* Linear zone - linear zone of the Uocv = Uocv(SOC, t°C) dependency, inside which the cell voltage changes insignificantly:
78 +** Linear zone: point 1 – starting point of the Uocv linear zone;
79 +** Linear zone: point 2 – ending point of the Uocv linear zone;
80 +* Coulomb counting correction (temperature) – the dependence of battery capacity on temperature;
81 +* Coulomb counting correction (cycles) – the dependence of battery capacity on the number of charge-discharge cycles.
82 +
83 +1.
84 +11.
85 +111. SOC correction
86 +
87 +The BMS Main 3 device can recalculate the battery SOC after long-term storage or after long-term working in the case when the battery was not charged fully or discharged totally. Recalculation is done based on the tabular dependency Uocv = Uocv (SOC, t) (see section** **2.3.2).
88 +
89 +To configure parameters for periodically correcting the battery state of charge, select the "Control → SOC correction" section:
90 +
91 +[[image:1733322624656-766.png]]
92 +
93 +In this section:
94 +
95 +* Enable – a flag to enable the SOC correction;
96 +* Shutdown period – a time the battery is off, day. If the BMS detects on its startup that it was off during the “Shutdown period” time, the BMS recalculates the battery state of charge based on the tabular dependency Uocv = Uocv (SOC, t);
97 +* Correction period – a period of correcting the battery SOC, day. If the BMS detects that the last correction was more than the “Correction period” ago, the BMS recalculates the battery state of charge based on the tabular dependency Uocv = Uocv (SOC, t) and tunes it gradually during the “SOC change time”.
98 +* SOC change time – a duration of the linear changing the battery SOC to the value calculated by the correction algorithm, minute;
99 +* Ignore the linear zone – a flag to ignore linear SOC zone while correction (recommended to be unset);
100 +* Last correction timestamp – time when last correction was made.
101 +
102 +
103 +1.
104 +11.
105 +111. Resistance estimation
106 +
107 +Calculation of the resistance of cells is carried out in two ways. The first method is used when the battery passes from a relaxation state to a charge or discharge state, wherein the cell resistance value
108 +
109 +R = (U-U,,ocv,,) / I,,stable,,,
110 +
111 +where U is the cell voltage measured in the charge or discharge state, V; U,,ocv,, is the cell voltage measured in the state of relaxation (before switching to the state of charge or discharge); I,,stable,, – stabilized current through the cell in the state of charge or discharge.
112 +
113 +The second method is used for a stepwise change in the current through the cell, while the value of the cell resistance:
114 +
115 +R = (U,,2,,-U,,1,,) / (I,,stable2,,-I,,stable1,,) provided that | I,,stable2,,-I,,stable1,, | > 0.2 × Q,,max,,
116 +
117 +(Q,,max,, is the maximum cell capacity),
118 +
119 +where U,,2,, is the voltage on the cell at the moment when the stabilized current I,,stable2,, is flowing through it; U,,1,, – the voltage on the cell at the moment when the stabilized current I,,stable1,, flowing through it.
120 +
121 +The stabilized current I,,stable,, = I, if during the stabilization time the instantaneous current I is in the range from 0.95 × I to 1.05 × I.
122 +
123 +To change parameters of the algorithm for calculating the cell resistance, select the "Control → Resistance estimation" section:
124 +
125 +[[image:1733322624659-473.png]]
126 +
127 +In this section:
128 +
129 +* Current stabilization time, millisecond;
130 +* Maximum calculation period – maximum time between resistance measurements. If more time has elapsed since the last determination of the stabilized current I,,stable,, than is determined in this field, the resistance calculation is not performed, second;
131 +* Maximum resistance factor – the coefficient of calculation of the maximum acceptable resistance of the cell;
132 +* Minimum SOC – minimum cell SOC value for resistance calculation;
133 +* Maximum SOC – maximum cell SOC value for resistance calculation.
134 +
135 +The calculated resistance is accepted by the system as valid (and therefore updated) if its value is in the range from Resistance/2 to “Maximum resistance factor” × Resistance, where "Resistance" is the nominal resistance of the cell (see section 2.3.1). If the calculated resistance value is greater than the value (Maximum resistance factor × Resistance), the updated resistance value will be equal to the value (Maximum resistance factor × Resistance).
136 +
137 +
138 +1.
139 +11.
140 +111. Low SOC (signal)
141 +
142 +To change the parameters of the generation a signal about low battery level, select the "Control → Low SOC (signal)" section:
143 +
144 +[[image:1733322624660-513.png]]
145 +
146 +In this section:
147 +
148 +* Enable – a flag to enable signal generation;
149 +* Minimum SOC, %;
150 +* Tolerant SOC, %;
151 +* Delay before setting the signal, second;
152 +* Delay before clearing the signal, second;
153 +* Lock – lock the signal until the device is reset.
154 +
155 +Signal generation conditions:
156 +
157 +* the battery SOC is less than the “Minimum SOC” value during the “Delay before setting the signal” time.
158 +
159 +Conditions for clearing the signal:
160 +
161 +* the battery SOC is greater than the “Tolerant SOC” during the “Delay before clearing the signal” time.
162 +
163 +The "Low SOC signal" is indicative and can be output to a discrete output or a power switch.
164 +
165 +
166 +1.
167 +11.
168 +111. High charging current (signal)
169 +
170 +To change the parameters of the generation high-current signal, select the "Control → High charging current (signal)" section:
171 +
172 +[[image:1733322624661-915.png]]
173 +
174 +In this section:
175 +
176 +* Enable – a flag to enable signal generation;
177 +* Maximum charging current, А;
178 +* Tolerant charging current, А;
179 +* Delay before setting the signal, second;
180 +* Delay before clearing the signal, second;
181 +* Lock – lock the signal until the device is reset.
182 +
183 +Signal generation conditions:
184 +
185 +* the measured current is greater than the “Maximum charging current” value during the “Delay before setting the signal” time.
186 +
187 +Conditions for clearing the signal:
188 +
189 +* the measured current is less than the “Tolerant charging current” value during the “Delay before clearing the signal” time.
190 +
191 +The "High charging current" signal is indicative and can be output to a discrete output or a power switch.
192 +
193 +
194 +1.
195 +11.
196 +111. Charge map
197 +
198 +The BMS Main 3 device calculates the maximum allowable charge current values in respect to SOC, battery temperature, contactor temperature and cell voltage.
199 +
200 +Calculated current values are sent to a charger or an intellectual load over the CAN bus. External devices based on received data provide correct battery operation.
201 +
202 +To configure parameters for determining the charge current limit, select the "Control → Charge map" section:
203 +
204 +[[image:1733322637793-171.png]]
205 +
206 +In this section:
207 +
208 +* Enable – a flag to start calculation of the charge current limit;
209 +* Maximum charge current – a maximum allowable value of the charge current (under normal conditions), A;
210 +* Rate of change – a rate of change the current limit to a new value (0 is for immediate change), A/s;
211 +* Option 1: Limit charge current by the battery SOC and temperature – a flag to enable correction of maximum allowable charging current Kcs depending on SOC and battery temperature;
212 +* Option 1: SOC x Temperature x Factor – the dependence of the correction factor on SOC and battery temperature;
213 +* Option 2: Limit charge current by the contactor temperature – a flag to enable correction of maximum allowable charging current Kcc depending on contactor temperature;
214 +* Option 2: Contactor temperature x Factor – the dependence of the correction factor on SOC and contactor temperature;
215 +* Option 3: Limit charge current by the maximum cell voltage - a flag to enable correction of maximum allowable charging current Kcv depending on maximum cell voltage;
216 +* Option 3: Cell voltage x Factor – the dependence of the correction factor on maximum cell voltage;
217 +* Option 4: Limit charge current by the cell temperature - a flag to enable correction of maximum allowable charging current Kct depending on maximum cell temperature;
218 +* Option 4: Cell temperature x Factor – the dependence of the correction factor on maximum cell temperature.
219 +
220 +Value of the charge current limit at given SOC, temperature, contactors temperature, maximum cell voltage and maximum cell temperature is calculated as follows:
221 +
222 +Charging current limit = Maximum charging current × Kcs × Kcc × Kcv × Kct
223 +
224 +
225 +1.
226 +11.
227 +111. Discharge map
228 +
229 +The BMS Main 3 device calculates the maximum allowable discharge current values in respect to SOC, battery temperature, contactor temperature and cell voltage.
230 +
231 +Calculated current values are sent to a charger or an intellectual load over the CAN bus.
232 +
233 +To configure parameters for determining the discharge current limit, select the "Control → Discharge map" section:
234 +
235 +[[image:1733322637795-310.png]]
236 +
237 +In this section:
238 +
239 +* Enable – a flag to start calculation of the discharge current limit;
240 +* Maximum discharge current – a maximum allowable value of the discharge current (under normal conditions), A;
241 +* Rate of change – a rate of change the current limit to a new value (0 is for immediate change), A/s;
242 +* Option 1: Limit discharging current by the battery SOC and temperature – a flag to enable correction of maximum allowable discharging current Kds depending on SOC and temperature;
243 +* Option 1: SOC x Temperature x Factor – the dependence of the correction factor on SOC and battery temperature;
244 +* Option 2: Limit discharge current by the contactor temperature – a flag to enable correction of maximum allowable discharging current Kdc depending on contactor temperature;
245 +* Option 2: Contactor temperature x Factor – the dependence of the correction factor on SOC and contactor temperature;
246 +* Option 3: Limit discharge current by the cell voltage - a flag to enable correction of maximum allowable discharging current Kdv depending on minimum cell voltage;
247 +* Option 3: Cell voltage x Factor – the dependence of the correction factor on minimum cell voltage;
248 +* Option 4: Limit discharge current by the cell temperature - a flag to enable correction of maximum allowable discharging current Kdt depending on maximum cell temperature;
249 +* Option 4: Cell voltage x Factor – the dependence of the correction factor on minimum cell temperature.
250 +
251 +Value of the discharge current limit at given SOC, temperature, contactors temperature, minimum cell voltage and maximum cell temperature is calculated as follows:
252 +
253 +Discharging current limit = Maximum discharging current × Kds × Kdc × Kdv × Kdt
254 +
255 +
256 +1.
257 +11.
258 +111. Charge map (PEAK & CONTINUOUS)
259 +
260 +The BMS Main 3 has an alternative algorithm for the maximum allowed charging current based on peak and continuous battery operating modes.
261 +
262 +To configure parameters for determining the charge current limit, select the "Control → Charge map (PEAK & CONTINUOUS)" section:
263 +
264 +[[image:1733322637796-187.png]]
265 +
266 +In this section:
267 +
268 +* Enable – a flag to start calculation of the charge current limit;
269 +* Maximum PEAK charge current – a maximum peak charge current (under normal conditions), A;
270 +* Maximum CONTINUOUS charge current – a maximum continuous charge current (under normal conditions), A;
271 +* PEAK: SOC x Temperature x Factor – the dependence of the correction factor for peak current K,,cp,, on SOC and battery temperature;
272 +* CONTINUOUS: SOC x Temperature x Factor – the dependence of the correction factor for continuous current K,,cc,, on SOC and battery temperature;
273 +* PEAK time – a time for peak current to be allowed, s;
274 +* Sliding time – a time of linear change of the maximum charging current from peak to continuous and from continuous to peak value, ms;
275 +* Waiting time – a time for peak current to be prohibited, s.
276 +
277 +The maximum charging current value equals to the peak or continuous current according to the following diagram:
278 +
279 +[[image:1733322717451-608.png]]
280 +
281 +I,,peak,, = Maximum PEAK charge current × K,,cp,,
282 +
283 +I,,continuous,, = Maximum CONTINUOUS charge current × K,,cc,,
284 +
285 +
286 +1.
287 +11.
288 +111. Discharge map (PEAK & CONTINUOUS)
289 +
290 +The BMS Main 3 has an alternative algorithm for the maximum allowed discharging current based on peak and continuous battery operating modes.
291 +
292 +To configure parameters for determining the discharge current limit, select the "Control → Discharge map (PEAK & CONTINUOUS)" section:
293 +
294 +[[image:1733322735595-661.png]]
295 +
296 +In this section:
297 +
298 +* Enable – a flag to start calculation of the discharge current limit;
299 +* Maximum PEAK discharge current – a maximum peak discharge current (under normal conditions), A;
300 +* Maximum CONTINUOUS discharge current – a maximum continuous discharge current (under normal conditions), A;
301 +* PEAK: SOC x Temperature x Factor – the dependence of the correction factor for peak current K,,dp,, on SOC and battery temperature;
302 +* CONTINUOUS: SOC x Temperature x Factor – the dependence of the correction factor for continuous current K,,dc,, on SOC and battery temperature;
303 +* PEAK time – a time for peak current to be allowed, s;
304 +* Sliding time – a time of linear change of the maximum charging current from peak to continuous and from continuous to peak value, ms;
305 +* Waiting time – a time for peak current to be prohibited, s.
306 +
307 +The maximum discharging current value equals to the peak or continuous current according to following diagram:
308 +
309 +[[image:1733322753429-968.png]]
310 +
311 +I,,peak,, = Maximum PEAK discharge current × K,,dp,,
312 +
313 +I,,continuous,, = Maximum CONTINUOUS discharge current × K,,dc,,
314 +
315 +
316 +1.
317 +11.
318 +111. Charge
319 +
320 +There are two contactors that serve charging the battery: a charging contactor and an allow charging contactor. With the help of the allow charging contactor, the BMS commands the charger to start or stop charging.
321 +
322 +The device supports three charge control algorithms:
323 +
324 +* Always on – charging is always allowed;
325 +* On charger connected – charging is allowed when there is a signal “Charger connected”;
326 +* On charge request – charging is allowed when there is a signal “Charge request”.
327 +
328 +If the "**Always on**" algorithm is selected, the charging contactor and the allow charging contactor are always closed. If at least one of the errors appears:
329 +
330 +* Overvoltage;
331 +* Overcurrent;
332 +* High temperature (CH);
333 +* Low temperature (CH);
334 +* HYG offline (optional);
335 +* Combilift offline (optional);
336 +* Spirit offline (optional);
337 +* Spirit charger error (optional);
338 +* Short circuit (optional);
339 +* High contactor temperature (optional);
340 +* CH contactor cycles error;
341 +* Precharge error (optional);
342 +* Critical error
343 +
344 +or one of the signals:
345 +
346 +* Service reset
347 +* Power down request
348 +* Inhibit charging
349 +
350 +both contactors are open (no current flows).
351 +
352 +When the algorithm "**On charger connected**" is selected, the control is performed as follows:
353 +
354 +* If there is a signal “Charger connected” and there are no errors (see the list above), then through the delay time T,,on,, the charging contactor and the allow charging contactor close;
355 +* If the signal “Charger connected” disappears, the allow charging contactor opens and after the delay time T,,off,, the charging contactor opens;
356 +* If in the process of charging the voltage on the cell exceeds the “Ready to charge” level, the allow charging contactor opens (while the charging contactor remains closed);
357 +* If errors in the list above occur the charging contactor and allow charging contactor open.
358 +
359 +When the "**On charge request**" algorithm selected, the control is performed as follows:
360 +
361 +* If there is a signal “Charge request” and there are no errors (see the list above), then through the delay time T,,on,, the charging contactor and the allow charging contactor close;
362 +* If the signal “Charge request” disappears, the allow charging contactor opens and after the delay time T,,off,, the charging contactor opens;
363 +* If in the process of charging the voltage on the cell exceeds the “Ready to charge” level, the allow charging contactor opens (while the charging contactor remains closed);
364 +* If errors in the list above occur the charging contactor and allow charging contactor open.
365 +
366 +Note – When errors occur in the system, the charging contactor opens either immediately or with the delay T,,off,, (depends on the settings described below).
367 +
368 +To change the parameters of the battery charge control algorithm, select the "Control → Charge" section:
369 +
370 +[[image:1733322798914-813.png]]
371 +
372 +In this section:
373 +
374 +* Enable – a flag to activate the charge control;
375 +* Algorithm:
376 +** Always on – charging is always allowed;
377 +** On charger connected – charging is allowed when there is a signal “Charger connected”;
378 +** On charge request – charging is allowed when there is a signal “Charge request”;
379 +* Current corresponding to charging – a current level to generate the "Charging current present" signal, A;
380 +* Current corresponding to no charging – a current level to clear the "Charging current present" signal, A;
381 +* Delay before starting charging – a time delay T,,on,, before closing the charging contactor and the allow charging contactor, millisecond;
382 +* Delay before stopping charging – a time delay T,,off,, before opening the charging contactor, millisecond;
383 +* Use custom delays before stopping charging (on errors) – a flag to enable manual settings of time delays T,,off,, for specific errors;
384 +* Custom delay: <error> – specific error delay, millisecond;
385 +* Switch off the charging contactor on errors without delay – a flag to protectively open the charging contactor without a delay. In the opposite case, when an error is detected, the charging contactor opens always with the delay “Delay before stopping charging”;
386 +* Control the precharging contactor – a flag that allows control of the precharging contactor;
387 +* Voltage to clear the “Ready to charge” – a threshold voltage level on the cell, V; if the voltage of any cell is above this level, the “Ready to charge” (hence, the “Allow charging”) signal is cleared;
388 +* Voltage to reset the “Ready to charge” – a tolerant voltage level on the cell, V; if all cell voltages are below the tolerant level, the “Ready to charge” (hence, the “Allow charging”) signal is set;
389 +* Delay before recharging – a time after which the previously opened the allow charging contactor closes again, minute; to disable the operation by timeout set "Delay before recharging" to 0.
390 +
391 +Note – The allow charging contactor closes under two independent conditions: 1) the voltage on the cells reaches the “Voltage to reset the “Ready to charge"” level and 2) the "Delay before recharging" time has passed since the opening of the allow charging contactor.
392 +
393 +1.
394 +11.
395 +111. Discharge
396 +
397 +The device controls the discharging contactor to connect battery to the load.
398 +
399 +The device supports three algorithms to control battery discharging:
400 +
401 +* Always on – load is always connected;
402 +* On charger disconnected – load is connected when there is no signal “Charger connected”;
403 +* On discharge request – load is connected when there is signal “Discharge request”.
404 +
405 +When the algorithm "**Always on**" is selected, the discharging contactor is always closed. If at least one of the errors appears:
406 +
407 +* Undervoltage;
408 +* Overvoltage (optional);
409 +* Overcurrent;
410 +* High temperature (DCH);
411 +* Low temperature (DCH) (optional);
412 +* HYG offline (optional);
413 +* Combilift offline (optional);
414 +* Spirit offline (optional);
415 +* Spirit charger error (optional);
416 +* Short circuit (optional);
417 +* High contactor temperature (optional);
418 +* Unallowable charging;
419 +* DCH contactor cycles error;
420 +* Precharge error (optional);
421 +* Critical error
422 +
423 +or one of the signals:
424 +
425 +* Service reset
426 +* Power down request
427 +* Inhibit discharging
428 +
429 +the discharging contactor opens.
430 +
431 +If the algorithm "**On charger disconnected**" is selected, the control is performed as follows:
432 +
433 +* if there is no signal “Charger connected”, the charging contactor is open and there are no errors (see the list above), then through the delay time T,,on,, the discharging contactor closes;
434 +* If the signal “Charger connected” appears or errors occur (see the list above), then after the delay time T,,off,, the discharging contactor opens.
435 +
436 +When the "**On discharge request**" algorithm selected, the control is performed as follows:
437 +
438 +* if there is signal “Discharge request”, the charging contactor is open and there are no errors (see the list above), then through the delay time T,,on,, the discharging contactor closes;
439 +* If the signal “Discharge request” disappears or errors occur (see the list above), then after the delay time T,,off,, the discharging contactor opens.
440 +
441 +Note – In case of errors in the system operation, the opening of the discharging contactor is performed either immediately or with a delay T,,off,, (depends on the settings described below).
442 +
443 +The device supports controlling the precharging contactor. The duration of switching on the precharging contactor before closing the discharging (load) contactor is adjusted.
444 +
445 +To change the parameters of the battery discharge control algorithm, select the "Control → Discharge" section:
446 +
447 +[[image:file:///C:/Users/INASIB~~1/AppData/Local/Temp/msohtmlclip1/01/clip_image001.png||alt="A screenshot of a computer
448 +
449 +Description automatically generated"]]
450 +
451 +In this section:
452 +
453 +* Enable – a flag to activate the discharge control;
454 +* Algorithm:
455 +** Always on – load is always connected;
456 +** On charger disconnected – load is connected when there is no signal “Charger connected”;
457 +** On discharge request – load is connected when there is signal “Discharge request”;
458 +* Current corresponding to discharging – a current level to generate the "Discharging current present" signal, А;
459 +* Current indicating no discharging – a current level to clear the "Discharging current present" signal, А;
460 +* Delay before starting discharging – a time delay T,,on,, before closing the discharging contactor, millisecond;
461 +* Delay before stopping discharging – a time delay T,,off,, before opening the discharging contactor, millisecond;
462 +* Use custom delays before stopping discharging (on errors) – a flag to enable manual settings of time delays T,,off,, for specific errors;
463 +* Custom delay: <error> – specific error delay, millisecond;
464 +* Switch off the discharging contactor on errors without delay – a flag to protectively open the discharging contactor without a delay. In the opposite case, when an error is detected, the discharging contactor opens always with the delay “Delay before stopping discharging”.
465 +* Precharge time – a duration of closing the precharge contactor before closing the discharging contactor, millisecond;
466 +* Check voltages before and after contactors to finish precharging – a flag to check the voltages before and after contactors to ensure that precharge process has finished and it is allowed to close the discharging contactor;
467 +* Minimum voltage difference to finish precharging – minimal voltage difference before and after contactors at which precharge process is meant to be finished, V;
468 +* Voltage to clear the “Ready to discharge” – a threshold voltage level on the cell, V; if the voltage of any cell is below this level, the “Ready to discharge” signal is cleared;
469 +* Voltage to reset the “Ready to discharge” – a tolerant voltage level on the cell, V; if all cells voltages are above the tolerant level, the “Ready to discharge” signal is set;
470 +
471 +
472 +1.
473 +11.
474 +111. Charge/Discharge
475 +
476 +The BMS Main 3 device can control the charging/discharging contactor, which combines algorithms of charging and discharging contactor. It behaves as a charging contactor when “Charge request” or “Charger connected” is set, otherwise – as a discharging contactor.
477 +
478 +The charging/discharging contactor control is configured in the “Control – Charge/Discharge” section:
479 +
480 +[[image:1733322827919-875.png]]
481 +
482 +In this section:
483 +
484 +* Enable – a flag to enable the charge/discharge controller.
485 +
486 +
487 +1.
488 +11.
489 +111. Discharge (AUX)
490 +
491 +The BMS Main 3 device can control the power supply of external equipment using the auxiliary (AUX) discharging contactor. An example of external equipment can be an inverter that converts DC to AC to power a service laptop and other devices.
492 +
493 +The power supply circuit of the external equipment using the auxiliary (AUX) discharging contactor is independent of the battery load circuit. The closing and opening of the auxiliary (AUX) discharging contactor is performed according to its program.
494 +
495 +If the power supply function of the external equipment is enabled, the auxiliary (AUX) discharging contactor closes. The opening of this contactor occurs on three independent conditions:
496 +
497 +* the battery has low SOC;
498 +* the battery voltage is out of range;
499 +* the battery system errors are detected.
500 +
501 +To change the parameters of the powering of external equipment, select the "Control → Discharge (AUX)" section:
502 +
503 +[[image:1733322827920-878.png]]
504 +
505 +In this section:
506 +
507 +* Enable – a flag to activate the auxiliary discharge control;
508 +* Switch off the discharging (AUX) contactor if the SOC is too low;
509 +* Minimum SOC – a minimum SOC value, when reached, the auxiliary (AUX) discharging contactor opens, %;
510 +* Tolerant SOC – a permissive SOC value, upon reaching which the auxiliary (AUX) discharging contactor re-closes, %;
511 +* Switch off the discharging (AUX) contactor if the battery voltage is out of the range;
512 +* Minimum voltage – minimum battery voltage, V;
513 +* Maximum voltage – maximum battery voltage, V;
514 +* Switch off the discharging (AUX) contactor on errors – the auxiliary (AUX) discharging contactor opens if the following errors occur: Undervoltage, Overcurrent, High temperature (DCH), Short circuit, Critical error.
515 +
516 +
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