BVS Series

Battery Voltage Supervisor

• Efficient analyzer for battery discharge testing
• Automated string and cell voltage, inter-cell connection voltage, string current and ambient temperature measurements during capacity tests
• Detection and notification of
• failing cells
• Reliable and easy to operate
• Detailed test analysis and reporting provided using DV-B Win software

Description

The Battery Voltage Supervisor (BVS) is a battery monitoring system for real-time data gathering and viewing.

The BVS main role is monitoring battery voltage values during a battery discharge testing in order to meet IEC, IEEE and NERC requirements.

The BVS is an integrated system consisting of:

• BVS Control Unit (BVS-CU)
• Cell Voltage Modules (CVM)
• String voltage module (SVM) (optional)
• String current module (SCM) (optional)

The BVS-CU performs monitoring and measurements data acquisition from the CVM modules and their transfer to a PC. In addition, the BVS-CU provides power supply to all connected CVM modules.

The cell voltage modules are installed on the individual batteries (cells), performing battery voltage and inter-cell voltage measurements. The BVS CM system acts as an add-on to the Battery Load Unit (BLU) series of devices while performing a battery discharge test, providing

detailed analysis of an individual cell’s condition. The BVS system identifies a potential battery malfunction by monitoring the following cell parameters from an array of the cell voltage modules CVM:

• Cell voltage
• Inter-cell connection voltage

In addition, the BVS-CU provides ambient temperature measurements on multiple locations (4 temperature channels). Overall string voltage and string current measurements can be achieved by using optional string voltage module (SVM) and string current module (SCM).

The CVM modules detect cells that fail a discharge test based on measured voltage values, so these cells can be safely removed from the battery string.

Data acquisition and extensive analysis capabilities of data collected from the CVM are available in the DV–B Win application software suite, providing a user data viewing, tracking and generation of comprehensive reports.

Applications

The list of the instrument applications includes:

• Real time cell condition assessment by monitoring and recording cell and inter-cell voltages from the set of the CVM modules during a battery capacity (discharge) testing as well as charging procedure.
• Real time ambient temperature monitoring with the BVS-CU unit
• String voltage and current monitoring using additional string voltage module (SVM) and string current module (SCM)
• In combination with the Battery Load Unit (BLU) instruments:
• Enables internal resistance calculation according to IEC60896-21
• Detailed data trending and analysis provided using DV-B Win software

BVS CM Connection Diagram

In the BVS system implementation, every CVM module is installed directly on an individual cell. Failure of one of the CVM modules will not affect communication between the rests of operating CVM modules and the BVS-CU. The connection diagram of the BVS to a battery string is presented in the figure below.

Features and Benefits

Extensive cell analysis during discharge test

Using the BVS as a supplement to the Battery Load Unit (BLU) devices provides multiple advantages during a battery discharge testing. The CVM modules measure voltage values in real-time mode and forward recorded data to the Control Unit in user defined intervals selected through DV-B Win application software.

All out-of-tolerance measurement values are announced by a LED signalization on an individual CVM module, so the failing cells can be detected before endangering the entire battery system. This enables detecting and safely bypassing the failing cell during a discharge process.

Up to 4 ambient temperature measurement channels are provided on the BVS-CU for measuring ambient temperature on multiple locations. Additional two modules can used in case string voltage and current measurements are required. Using these two optional modules enables the BVS system to work in conjunction with any load bank on the market and perform completely automated capacity test.

Battery Internal Resistance Measurement

The battery internal resistance calculation is an additional BVS feature available in combination with the BLU instruments. The test method used for internal resistance calculation complies with battery test methods recommended by the IEC60896-21 standard.

DV-B Win Software

All results transferred from the BVS system can be viewed, analyzed and presented in selectable report forms by using the DV-B Win software application.

Data can be transferred to a PC through USB or Bluetooth communication.

Both, the BVS and the BLU device provided results can be viewed on the same report form. A quick pass/fail test for a cell internal resistance values may be performed based on a user defined thresholds, adding additional insight in an individual cell’s status.

DV-B Win Main Features

• Full control of the BVS from a PC
• Both discharge results from BLU device and cell voltage values from CVM can be previewed in one DV-B Win file
• Acquisition and detailed analysis of measured data
• String voltage, Cell voltage, inter-cell voltage and internal resistance trending
• Test report for BLU and BVS are available in several formats (Excel spreadsheet, pdf, word or RTF)
• User selected sampling time of CVM

DV-B Win features: String View (BLU) & Cell View (BVS) functions

Technical Data

Mains Power Supply

• Input voltage: 90 – 264 V AC, 50/60 Hz
• Input power: 110 VA
• CVM supply voltage: 66 V DC
• Maximum relative humidity: 95 % for temperatures up to 31 °C/88 F, decreasing linearly to 40 % relative humidity at 55 °C/131 F

Measurement

Dimensions and Weight

• Dimensions (L x W x D):

• Typical accuracy:

±50 mV DC: ± (1% rdg + 1% F.S)

• ±1 V DC: ± (0,1% rdg + 0,1% F.S)

±30 V DC: ± (0, 1% rdg + 0,1% F.S) ± 600 V DC ± (0, 1% rdg + 0,1% F.S)

BVS-CU: 206 mm x 180 mm x 64 mm 8.11 In x 7.08 in 2.51 in CVM: 66 mm x 28 mm x 139 mm 2.6 In x 1.1 in x 5.5 in SVM: 66 mm x 28 mm x 139 mm 2.6 In x 1.1 in x 5.5 in SCM: 66 mm x 28 mm x 139 mm 2.6 In x 1.1 in x 5.5 in

Weight: BVS-CU: 0, 78 kg / 1.7 lbs. CVM: 0, 14 kg / 0.3 lbs. SVM: 0, 18 kg / 0.4 lbs. SCM: 0, 18 kg / 0.4 lbs.

• Temperature:
• 20 °C - +80 °C / -4 °F - +176 °F

Warranty

•  3 years

BVS-CU and CVM communication

• RS485 serial communication

Communication with PC

• USB
• Bluetooth

Memory

• Internal SD Card: 2 GB SD

Applicable Standards

•  Pollution degree: 2
•  Insulation category: I
•  Safety: EN 61010-1, LVD 2014/35/EU IEC 61010-1 (International standard) UL 61010-1

CAN/CSA-C22.2 No. 61010-1, 2^nd edition, including Amendment 1

Environment conditions

• Temperature:

Electromagnetic Compatibility (EMC)

• CE conformity: EMC standard EN 61326-1:2013 EMC directive 2014/30/EU
• 40 °C to +85 °C /-40 °F to +185 °F

All specifications herein are valid at cell temperature of + 25 °C and recommended accessories. Specifications are subject to change without notice.

Ordering Info:

• * Number of CVM may vary depending on application
• ** Different cable lengths available upon request
• ***Different types of temperature sensors available upon request