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Last modified by Admin on 2025/07/08 22:13
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1 = Introduction =
2
3 This article describes BMS Main 3 / BMS Main 3X calibration process that helps to improve precision of high voltage measurement (battery voltage) before and after contactors.
4
5 = 1. Required equipment =
6
7 Following hardware is required for calibration:
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9 * BMS Main 3 / BMS Main 3X device with firmware v2.4.0 of higher (see [[Firmware>>doc:Firmware.bms-main-3.WebHome]]);
10 * DC power supply with 9-32V output voltage for powering up the BMS Main 3 / BMS Main 3X;
11 * DC power supply with 500-1000V output voltage for calibration;
12 * A precision voltmeter with a measurement range of at least 1000V and a total intrinsic error below 0.2%.;
13 * Connection adapters to communicate with BMS Main 3: USB-miniUSB cable (if USB connection is used), USB-CAN adapter (if CAN communication is used);
14 * PC or laptop.
15
16 Required software:
17
18 * ElectricDeviceMonitor software for configuring BMS Main 3 (see [[ElectricDeviceMonitor>>doc:Software.ElectricDeviceMonitor.WebHome]])
19
20 = 2. Calibration procedure =
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22 (% class="box errormessage" %)
23 (((
24 When working with high voltage, follow electrical safety rules, use protective glasses, protective clothing, insulated tools and devices. To prevent damage to the device, avoid static discharges while working with it.
25 )))
26
27 Follow these steps to calibrate the high voltage measurement circuit.
28
29 **1)** Connect BMS Main 3 / BMS Main 3X to DC power supply with 9-32V output voltage (X1 header), to DC power supply with 500-1000V output voltage (X11-X12 headers for HV1 lines calibration; X13-X14 headers for HV2 lines calibration) and to PC (X6 or X10 header). When connecting, you must follow [[Connection manual>>doc:Battery management systems.BMS Main 3.2\. Installation and connection.WebHome]].
30
31 **2)** Apply power to BMS Main 3 / BMS Main 3X and generate a KEYRUN signal to start the device. To do this, turn on a power source with an output voltage of 9 to 32V.
32
33 **3) **Launch ElectricDeviceMonitor, select Unified Monitor, and choose the required connection method:
34
35 * Via USB bus (for this, you need to specify the name of the device’s virtual COM port)
36 * Via CAN bus (for this, you need to select the appropriate adapter type and specify the device ID on the network, which is **32** by default).
37
38 **4)** Connect to BMS Main 3 / BMS Main 3X using the "Service" account.
39
40 **5)** Turn on a DC power supply with an 500-1000V output voltage. For calibrating BMS Main 3, a voltage of 500V is recommended.
41
42 **6) **Calibrating the HV1 circuit:
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44 a) Connect a precision voltmeter to the 500-1000V DC power supply output terminals that are connected to the HV1 measurement circuit (connectors X11-X12).
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46 b) In the Unified Monitor window of the ElectricDeviceMonitor software, select the State tab and go to the "Service – Calibration" section. In the "High Voltage 1: Reference voltage" field, enter the reading from the precision voltmeter.
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48 c) Click the "High Voltage 1: Calibrate" button.
49
50 The HV1 measurement circuit calibration will begin. The process takes about 2 seconds. Be sure to wait until calibration is complete.
51
52 d) Verify the operation of the HV1 high-voltage measurement circuit by comparing the "Battery – High voltage 1" value with the voltmeter reading.
53
54 **7) **Calibrating the HV2 circuit:
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56 a) CConnect a precision voltmeter to the 500-1000V DC power supply output terminals that are connected to the HV2 measurement circuit (connectors X13-X14).
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58 b) In the Unified Monitor window of the ElectricDeviceMonitor software, select the State tab and go to the "Service – Calibration" section. In the "High Voltage 2: Reference voltage" field, enter the reading from the precision voltmeter.
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60 c) Click the "High Voltage 2: Calibrate" button.
61
62 The HV2 measurement circuit calibration will begin. The process takes about 2 seconds. Be sure to wait until calibration is complete.
63
64 d) Verify the operation of the HV2 high-voltage measurement circuit by comparing the "Battery – High voltage 2" value with the voltmeter reading.
65
66 **8)** Turn off all power supplies. The calibration is now complete.