Simga2N Traction Advanced Manual– V1.3 Page 118 (166) ©2021 DMC GmbH Herten Germany
M6-2 BMS master controller “BMS Mast”
This parameter is used to define if the DMC Sigma2N Controller will act as a “BMS master”. This implies that
the following tasks will be performed:
1) Manage the NMT message to BMS (in case it is required by the adopted BMS);
2) Manage the SYNC message to the BMS (in case it is required by the adopted BMS);
3) Manage the RxPDOs messages to the BMS (in case it is required by the adopted BMS);
4) Manage the BMS information to be sent to the DMC Display.
Notice that, even if a DMC Controller has this parameter set to “0”, it will receive all the BMS information and
react to BMS warnings, errors and timeouts. Anyway, it will not manage the BMS itself (sending NMT, SYNC,
etc..) and this might cause a misfunction.
In a CAN network with a BMS and only one DMC Sigma2N Controller, it is mandatory that the DMC Sigma2N
Controller has this parameter set to “1”.
In a CAN network with a BMS and more than one DMC Sigma2N Controller, it is mandatory that only one
Controller has this parameter set to “1”. All other Controllers must have this parameter to “0”.
M6-3 BMS current repartition “ShareCur”
This parameter defines the percentage of Drive/Regenerative battery current actually absorbed by the DMC
Sigma2N Controller among the total available Drive/Regenerative current value limited by the BMS. For
examples and details please refer to [9].
M6-4 Allow driving during BMS recharge “Drv@Chg
This parameter can be used to allow the Sigma2N controller to drive even while the BMS is commanding a
battery charge.
Mind that this situation may be dangerous, as the vehicle can be driven away with the battery charger still
plugged in.
It is only suggested to enable it on stationary vehicles/actuators.
M6-5 Maximum BMS current “MaxBattA”
This parameter defines the maximum peak current that the battery can output. This is assumed equal to the
maximum current that the battery can receive when the motor is braking.
This parameter assumes two different meanings, depending on the BMS adopted:
1) For scaling the dynamic maximum allowed Drive and regenerative current, in case the BMS is sending
those values in percentage (BBS FLASH BATTERY).
NOTICE: when FlashBattery BBS is asking to reduce drive current by its maximum value, the current is
not cut completely. It is possible to set a “minimum cut value” trough parameter “M5.4-1 Drive battery
current limit “IBattMax””. This means that the drive current will be linearly cut between “M6-5
Maximum BMS current “MaxBattA”” and “M5.4-1 Drive battery current limit “IBattMax””. If you wish
to cut drive current to 0 when the BBS is asking for “max reduction”, set “M6-5 Maximum BMS current
“MaxBattA”” to 0 or higher than “M5.4-1 Drive battery current limit “IBattMax””.
2) For limiting the Drive and Regenerative current, in case the BMS is sending only “Allow drive current”
and “Allow regen current” bits (LIONIC BMS and ELEO BMS). Please notice that for ELEO BMS,
regenerative current is set to 90% of this value.
M6-6 Nominal battery voltage “NomBatV”
Is the nominal value of the battery connected to the controller.
M6-7 BDI reset level “BDIreset”
This sets the voltage at which the BDI will reset to show a 100% charged battery on the Sigmagauge or the DMC
Display. This setting only has an effect at power-up.
The adjustable range is from 18V to controller absolute maximum voltage, that corresponds to 125% of the
nominal operating voltage of the controller.
M6-8 BDI empty level “BDIempty”
This sets the 0% state of charge level for the BDI. Whenever the battery voltage is equal to or less than “Nominal
battery voltage “NomBatV”” battery voltage, the BDI value will start to decrease.
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