3.2 Inputs and outputs - Movicom Electric Docs

== 3.2.1 Discrete inputs ==

The BMS Main 3 device has 6 discrete inputs that detect signal line closing to the virtual ground, and 2 inputs that detect 9-32V input voltage. For each discrete input, its assignment and inversion flag are set.

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Also, BMS has two additional configurable inputs named “KEYRUN” and “CHARGE_ON”, each serves 9-32V input voltage. Those inputs serve as power buttons with additional functions that can be set.

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Assignments of discrete inputs are configured in the "Signals → Input discrete signals → Assignments" section:

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The device supports the following assignments for discrete inputs:

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* No input – input is not used;

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* Battery cover – a signal from the battery cover;

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* Charger connected – a signal indicating that charger is connected;

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* Power up/down request – a request to power down the device;

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* Inhibit charging – a command to open the charging contactor;

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* Inhibit discharging – a command to open the discharging contactor;

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* CH contactor feedback – a signal from charging contactor feedback loop;

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* DCH contactor feedback – a signal from discharging contactor feedback loop;

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* Insulation status – a signal from an insulation monitoring device;

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* Charge request – a request to close the charging contactor;

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* Precharge request – a request to close the precharging contactor;

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* Discharge request – a request to close the discharging contactor;

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* PCH contactor feedback – a signal from precharging contactor feedback loop;

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* CH/DCH contactor feedback – a signal from charging/discharging contactor feedback loop;

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* Main contactor feedback – a signal from main contactor feedback loop;

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* Interlock – a signal from interlock loop;

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* Fuse 1, Fuse 2, Fuse 3 – signals from fuses;

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* Circuit breaker status – status of protection disconnector;

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* Balancing request – a request to balance the cells;

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* Close Main contactor – a request to close the main contactor.

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Inversion flags for discrete inputs are configured in the "Signals → Input discrete signals → Inversion" section:

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The behavior of “KEYRUN” signal can be configured in the "Signals → Input discrete signals → KEYRUN mode" section:

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The behavior of “CHARGE_ON” signal can be configured in the "Signals → Input discrete signals → CHARGE_ON mode" section:

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In both “KEYRUN mode” and “CHARGE_ON mode“ sections:

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* Do nothing – power on device and do nothing;

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* Set “Discharge request” – power on device and set “Discharge request” signal immediately;

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* Set “Charge request” – power on device and set “Charge request” signal immediately.

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== 3.2.2 Current sensor ==

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The BMS Main 3 device has an ability to measure battery current by 3 external Hall-Effect current sensors.

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Current sensor settings are configured in the "Signals → Current sensor" section:

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The device supports the following current sensor settings:

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* Connection – type of multiple sensors connection

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** One sensor (#1) – only first sensor is used to measure the battery current;

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** Two sensors (#1 and #2) in parallel – sensors are connected in parallel (the total battery current equals the sum of two sensors);

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** Two sensors (#1 and #2) in different branches – sensors located in two halves of the battery (used in batteries with a middle point);

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* Sensor 2, 3: Enable – a flag to enable the second of third current sensor;

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* Sensor 1, 2, 3: Nominal current – rated current I,,nom,, of the sensor according to the datasheet, А;

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* Sensor 1, 2, 3: Sensitivity – sensitivity of the current sensor according to the datasheet, V / I,,nom.,,;

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* Sensor 1, 2, 3: Invert – invert the sign of the measured value;

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* Sensor 1, 2, 3: Multiply charging current (experimental) – an experimental flag for scaling the charging current by given multiplier;

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* Sensor 1, 2, 3: Multiplier for charging current – charging current multiplier;

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* Sensor 1, 2, 3: REF_IN2 mode – mode of additional analog line:

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** Not connected;

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** Reference line – reference output of the sensor;

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** Low range (for the dual range sensor) - a second output of a dual-range sensor (for example, LEM DHAB series);

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* Sensor 1, 2, 3: Low range nominal current - rated current I,,nom,, of the low current line of dual range sensor according to the datasheet, А;

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* Sensor 1, 2, 3: Low range sensitivity – sensitivity of the low current line of dual range sensor according to the datasheet, V / I,,nominal.,,;

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* Sensor 1, 2, 3: Threshold for low range – a threshold current value at which the device uses the readings of the high current sensor instead of low current, A;

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* Calibrate – a flag to calibrate (find a 0A point) the current sensor when the device is started;

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* Calibration time – calibration time of the current sensor, millisecond;

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* Recalibrate current sensor – a command to calibrate the current sensor manually.

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== 3.2.3 Shunt sensor (CAN bus) ==

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The BMS Main 3 device has an ability to measure battery current via a shunt sensor, connected to the CAN bus.

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**Note: **The shunt sensor communication protocol can be provided by request.

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Shunt sensor settings are configured in the "Signals → Shunt sensor (CAN bus)" section:

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The device supports the following shunt sensor settings:

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* Enable – a flag to start interaction with the BMS Current Sensor (if interaction is enabled, then BMS doesn’t use Hall-Effect current sensor which settings are described in the section "Signals → Current sensor");

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* Node ID – an address of BMS Current Sensor in the CANopen network;

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* Invert – a flag to invert current measurements;

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* Receive timeout – a timeout for receiving messages from the BMS Current Sensor (if no data is being received from the current sensor during this time, the “Shunt offline” flag is set), millisecond;

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* Mean value threshold – T,,M,, level, A (if module of instantaneous current (I,,I,,) which is received from the shunt sensor is between T,,M,, and T,,0,,, the BMS will use mean value of current I,,M,,; if I,,I,, is greater than T,,M,,, the BMS will use instantaneous value of current I,,I,,);

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* Zero threshold – T,,0,, level, A (if module of instantaneous current (I,,I,,) which is received from the shunt sensor is lower than T,,0,,, the BMS will assume that current flowing through the battery is zero);

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=== 3.2.4 Temperature sensors ===

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Temperature sensors settings are configured in the "Signals → Temperature sensors" section:

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In this section:

* Type – a type of temperature sensors.

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=== 3.2.5 Output discrete signals ===

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The BMS Main 3 device has 4 open drain type outputs. For each discrete output, its assignment and inversion flag are set.

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Assignments of discrete outputs are configured in the "Signals → Output discrete signals → Assignments" section:

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The device supports the following assignments for discrete outputs:

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* No output – output is not used.

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* Low SOC – a signal corresponding the low SOC of the battery;

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* High charging current – charging current is high;

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* Main contactor – state of the main contactor;

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* Charging – state of the charging contactor;

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* Allow charging – a signal for a charger to start charging;

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* Charging current present – the presence of the charging current;

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* Precharging – state of the precharging contactor;

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* Discharging – state of the discharging contactor;

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* Discharging current present – the presence of the discharging current;

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* Discharging (AUX) – state of the auxiliary discharging contactor;

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* Power down ACK – an acknowledgement of BMS power down. Acknowledgement is outputted when the charge and discharge contactors have been opened on power down request;

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* Charging/discharging - state of the charging/discharging contactor;

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* Heater – a command to turn on a heater;

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* Cooler – a command to turn on a cooler;

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* Balancing 1 – balancing the first series of cells;

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* Balancing 2 – balancing the second series of cells;

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* Ready to charge – the battery is ready to be charged;