Wireflow WF 3169 User manual

WF 3169
User Manual
AC0117-004, rev B

WF 3169 | User Manual
1
© WireFlow 2018
AC0117-004, rev B
Contents
Support information ........................................................................................................... 2
Technical support and Product information................................................................ 2
WireFlow headquarters .................................................................................................. 2
Important information........................................................................................................ 2
Copyright........................................................................................................................... 2
High risk activities ............................................................................................................ 2
Safety Guidelines ............................................................................................................. 2
CAUTIONS ......................................................................................................................... 2
Compliance........................................................................................................................... 3
Device information.............................................................................................................. 4
Introduction...................................................................................................................... 4
Specifications.................................................................................................................... 6
Pinout ................................................................................................................................ 7
External wiring of battery cells....................................................................................... 8
Software................................................................................................................................ 9
Requirements ................................................................................................................... 9
Installation ........................................................................................................................ 9
Supported Platforms ....................................................................................................... 9
API ...................................................................................................................................... 9
Examples......................................................................................................................... 11
Technical support and Professional services................................................................. 12
Waste Electrical and Electronic Equipment (WEEE)....................................................... 12

WF 3169 | User Manual
2
© WireFlow 2018
AC0117-004, rev B
Support information
Technical support and Product information
www.wireflow.se
WireFlow headquarters
WireFlow AB
Theres Svenssons gata 10
SE-417 55 Göteborg
Please see appendix “Technical support and Professional services”for more
information.
© WireFlow AB, 2018
Important information
Copyright
The WF 3169 module and accompanying software driver is Copyright ©2018,
WireFlow AB.
High risk activities
The software and hardware is not designed, manufactured or intended for use or
resale as on-line control equipment in hazardous environments requiring fail-safe
performance, such as in (but not limited to) the operation of nuclear facilities,
aircraft navigation or communication systems, air traffic control, direct life support
machines, or weapons systems, in which the failure of the Software could lead
directly to death, personal injury, or severe physical or environmental damage
("High Risk Activities"). WireFlow and its suppliers specifically disclaim any express
or implied warranty of fitness for High Risk Activities.
Safety Guidelines
Operate the WF 3169 only as described in this manual.
Make sure that installation and wiring is performed by qualified
personnel according to the guidelines in this manual.
CAUTIONS
Electrostatic discharge (ESD) can damage components.
Please wear an ESD wrist strap when handling the module.

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© WireFlow 2018
AC0117-004, rev B
Compliance
CE - European Union EMC and Safety Compliance
This product meets the essential requirements of applicable European Directives,
as follows:
•2014/35/EU; Low-Voltage Directive (safety)
•Electromagnetic Compatibility (EMC) Directive 2014/30/EU
•RoHS Directive 2011/65/EU
Please contact WireFlow to get a copy of the Declaration of Conformity for the WF
3169 module

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© WireFlow 2018
AC0117-004, rev B
Device information
Introduction
The WF 3169 from WireFlow is a 24-channel battery monitoring device that includes
an ADC and a high voltage input multiplexer. The module can measure up to 24
series-connected cells with a voltage up to 5V per cell.
The module is designed for the CompactRIO platform from National Instruments.
The module measurement circuitry is galvanically isolated from the other modules
in the system and provides up to 1000 VDC channel-to-earth rated working voltage,
making the module ideal for accurately monitoring large battery stacks. By using
several WF 3169 modules connected in series it is possible to monitor every cell in
a long string of series-connected cells.
The challenge of measuring a battery stack is that the “voltmeter” used to measure
the voltage over each cell must withstand a high “common mode” voltage relative
the ground of the series connected battery stack. Also, the multiplexer that is used
to move the voltmeter between the cells must withstand this high common mode
voltage.
+
+
+
+
+
+
+
+
VOLTMETER
Figure 1 –Voltmeter on multiple cells
The minus pole of the bottom cell should always be connected to the chassis
ground of the compact RIO chassis. Please note that the COM pin on the WF 3169 is
isolated from chassis ground. So, by connecting the lowest battery to chassis
ground you will also connect the COM pin of the WF 3169 to chassis ground.

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© WireFlow 2018
AC0117-004, rev B
It is possible to measure on more than 24 cells by using several WF 3169 modules
connected in series. As always, the minus pole of the bottom cell should be
connected to the chassis ground of the compact RIO chassis. By doing this you will
connect the COM of the first WF 3169 to chassis ground.
The minus pole of the 25th cell (no 24) shall be connected to COM on the second
WF 3169 and also to C23 of the first WF 3169. The illustration below shows an
example where three WF 3169 are used to measure on 49 cells, (Cell0..Cell48).
Cell49..Cell71 are unused.
CELL n
CELL n+1
CELL n+24
CELL n+25
CELL n+47
+
C0
COM
+
+
C23
C1
MUX
ADC
WF 3169
≈≈ ≈
+
C0
COM
+
+
C23
C1
MUX
ADC
WF 3169
≈≈ ≈
CELL n+23
CELL n+48
C0
COM
+
C23
C1
MUX
ADC
WF 3169
≈≈ ≈
Figure 2 - Using multiple WF 3169

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© WireFlow 2018
AC0117-004, rev B
Specifications
Analog Input Characteristics
Number of channels
24
Maximum voltage Cnto Cn-1
-0.3 to 8 V
Maximum voltage C23 to C11
-0.3 to 75 V
Maximum voltage C11 to COM
-0.3 to 75 V
Measurement range Cnto Cn-1
0 to 5 V
Measurement resolution
0.1 mV *1
Measurement error (typical and (max))
2V: ±0.1mV (max ±0.8)
3.3V: ±0.2mV (max ±1.2)
4.2V: ±0.3mV (max ±1.6) *2*3
Max sampling rate
235 Hz
Input leakage current
10 nA typical
Input current when inputs are measured
±2 uA typical
Power Requirements
Power consumption from chassis
580 mW maximum
Thermal dissipation
580 mW maximum
Isolation Voltages (rated working voltage)
Channel-to-channel
None
Channel-to-earth ground, Continuous
1000 V
Environmental
Operating temperature
-40 °C to 70 °C
Storage temperature
-40 °C to 85 °C
Pollution
Degree 2
Maximum altitude
2000 m
Indoor / Outdoor
Indoor use only
Calibration
Calibration Interval
No calibration needed
*1ADC readings are scaled from 0.1mV to FXP with 0.061 mV resolution by the LabVIEW driver.
*2Data is for Non-noisy electromagnetic environments
*3Diagram below shows Measurement Error vs Input

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Pinout
C23
n.c
C23
C21
C19
C17
C15
C13
C11
C7
C5
C3
COM
n.c
n.c
COM
C9
C1
n.c
n.c
n.c
C22
C20
C18
C16
C14
C12
C8
C6
C4
C0
n.c
n.c
n.c
C10
C2
Figure 3 - Pinout on 36 pole spring-terminal
•COM Common reference connection to isolated ground
•Cx Analog input connections. For battery cells.
•n.c No connections

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© WireFlow 2018
AC0117-004, rev B
External wiring of battery cells
You can connect the battery cells like this:
+
+CELL n
+
MUX
ADC
WF 3169
≈
≈≈ ≈
C23
C1
C0
CELL n+1
CELL n+23
COM
≈
≈
Max 5 V
Max 5 V
Max 120 V
Max 1000 V
Figure 4 - External wiring of battery cells
If you have more inputs on your WF 3169 module(s) than you have cells, then it is
recommended to start adding cells from bottom (COM) and upwards. Leave the top
inputs without any cells. The recommendation is to short-circuit the unused Cx
inputs where no cells are used.
If no cell is attached to an input then quite high voltages can be measured by the
WF3169 module on that input. This is an expected behavior and is caused by the
measurement IC that is used inside the WF3169 which will impart a very small
current when the ADC takes a measurement. The switched cap design of the ADC is
exceptionally accurate, so it won’t add any offset error by adding input amplifier
sections. Some of the glitch energy may also be coming from the MUX in the IC
since there can be residual gate charge between switches that are at different
potentials.
So, the conclusion is that the voltages seen on the empty inputs is an expected
behavior and will not have any impact on the measurement accuracy when a
battery is connected to the input. We recommend making a short-circuit over the
unused inputs to minimize the voltages created by these small ADC currents.
The recommendation is also to connect the minus pole of the CELL 0 to chassis
ground on the compactRIO. It shall also be connected to the COM connector on the
WF 3169.

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© WireFlow 2018
AC0117-004, rev B
Software
The WF 3169 is delivered with a LabVIEW driver to manage the module using FPGA
property nodes and IO nodes. This chapter describes the installation, requirements
and basic usage.
Requirements
•LabVIEW Full (version >= 2017 SPI*)
•LabVIEW FPGA module
•NI-RIO (version >= 17.6)
•VIPM 2017 or higher
* Previous version of this driver (v1.0.0) is available on www.wireflow.se and supports LabVIEW 2014.
The WF 3169 driver currently requires the LabVIEW FPGA toolkit. The software for the WF
3169 is delivered as a VIPM packet (*.vip) and requires the free version of VI Package
Manager (VIPM) to be installed (available at jki.net or from ni.com).
Installation
The easiest way to install/update the WF 3169 software is (when VIPM is already
installed);
1. Double click the *.vip package
2. Follow the instructions in VIPM to select LabVIEW version where to install
the driver
3. Restart LabVIEW
Once installed the necessary files should be installed in the LabVIEW application
folders, see the API section for details.
Supported Platforms
The WF 3169 module can be used in any C Series chassis, with LabVIEW FPGA
programming enabled. This currently excludes the CompactDAQ series of chassis,
but includes cRIO, EtherCAT and FPGA expansion chassis.
API
Once the WF 3169 module has been added to the project the module can be
controlled using property nodes and I/O nodes. The property nodes return
information about the current firmware, the information returned is;
•This is the identification number of the WF 3169 module
•Serial number of the module
•Vendor identification number (in this case WireFlow)