LEM Sentinel 2 User manual

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BATTERY MANAGEMENT
S-BUS
(SENTINEL 2, I-LINK 2, S-BUS CONVERTER)
USER GUIDE

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REVISIONS
Document
version Sentinel Firmware Date Evolution
V 0.0 V1.10,
V1.11 2007-11- 12 Creation
V 1 V1.10,
V1.11 2008.04.09
Added LEM address (page 4) + modified power
supply in range (page 8) and Additional input power
supply (page 9)

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TABLE OF CONTENTS
1NOTICES......................................................................................................................4
1.1 SAFETY INSTRUCTIONS.............................................................................................4
1.1.1 Qualified personnel.......................................................................................................4
1.1.2 Safe operation ..............................................................................................................4
1.1.3 Maintenance and repairs ..............................................................................................4
1.1.4 Ce marking....................................................................................................................4
2GENERAL DESCRIPTION............................................................................................5
2.1 COMMUNICATION .......................................................................................................6
2.2 SENTINEL DEVICE ......................................................................................................7
2.3 I-LINK DEVICE..............................................................................................................8
2.4 S-BUS CONVERTER....................................................................................................9
3PROTOCOL................................................................................................................10
3.1 COMMAND.................................................................................................................10
3.2 RESPONSE................................................................................................................12
3.3 SPECIFIC I-LINK COMMANDS & RESPONSES........................................................15
4INSTALLATION..........................................................................................................17
4.1 SYSTEM CONNECTIONS..........................................................................................17
4.2 SEQUENCE FOR A NEW SENTINEL OR I-LINK INSERTION...................................18

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1NOTICES
This document is the user guide describing how to use the different modules developed by
LEM in a complete Battery Management environment, without the general monitor product
MicroGuard. Such network is based on S-Bus communication, protocol supported by LEM
Sentinel-2 and I-Link-2 devices on the S-Bus and I-Bus communication links, respectively.
Both are connected to any OCS (Overview and Control System) serial port through LEM
RS232 to S-Bus converter.
1.1 Safety instructions
The design and manufacture of this LEM’s battery Management device conforms to the latest
state of technology and the safety referenced in IEC 61010-1/ 2nd edition. If used improperly,
there could be a risk of damage to both persons and property.
The device may only be used indoors.
1.1.1 Qualified personnel
Only qualified personnel should operate this equipment.
This includes all persons who are familiar with the installation, assembly, connection,
inspection of connections and operation of the monitoring system, and who have completed
training in the following areas :
•Switching on/off, enabling, grounding, and identification of electrical circuits and
devices/systems according to the applicable safety standards
•Maintenance and operation of appropriate safety gear, in accordance with the
applicable safety standards
•Medium & High voltage battery applications
1.1.2 Safe operation
Ensure that all persons using the device have read and fully understood this operating manual
including safety instructions.
The devices may only be used under certain ambient conditions. Ensure that the actual
ambient conditions conform to the admissible conditions specified in their datasheets.
Do not use the devices for any other purpose than the measuring of voltages and currents
that are within the specified operating range. Improper use shall void all warranty.
If any damage is detected to the housing, controls, power cable, connecting leads or
connected devices, immediately disconnect the unit from the power supply.
Ensure that the connected devices work properly
1.1.3 Maintenance and repairs
Damaged or defective devices must be inspected/repaired by authorized technicians.
For technical assistance, please contact LEM at: Chemin des Aulx, 8
CH-1228 PLAN-LES-OUATES
Geneva, Switzerland
www.lem.com
1.1.4 CE marking
}Conformity mark re. EC Low Voltage Directive 73/23/EEC and
EMC Directive 89/336/EEC.

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2GENERAL DESCRIPTION
The system is composed of Sentinel transducer modules, connected to every bloc being
monitored, linked together by S-BUS communication. Float and discharge current sensors are
interfaced via the I-Link module.
Only use the accessories supplied with such devices, specifically available for your equipment
(see table below).
DESCRIPTION PART (CLEM) Numbers
Sentinel 2 -LV, 2V 66.61.05.000.0
Sentinel 2 -HV, 6-12V 66.61.14.000.0
I-Link 2 66.82.98.000.0
S-Bus converter 66.81.98.001.0
BM Cable power 0.25m 66.30.98.007.0
BM Cable power 0.4m 66.30.98.017.0
BM washer 06mm 66.30.98.013.0
BM washer 08mm 66.30.98.014.0
BM washer 10mm 66.30.98.015.0
BM washer 12mm 66.30.98.016.0
BM Cable comm 0.4m 66.30.98.001.0
BM Cable comm 1.0m 66.30.98.002.0
BM Cable comm 2.0m 66.30.98.003.0
BM Cable comm 5.0m 66.30.98.004.0
BM Cable comm 10m 66.30.98.005.0
BM Cable comm 15.0m 66.30.98.009.0
The Sentinel modules are connected to the bloc by Power & Sense leads, with available
connection lengths: 250mm or 400mm.
Special Kelvin washers (0.8 mm thick) are available and must be used to connect the power &
sense leads to the blocs in order to insure correct bloc impedance measurements.
S-Bus and I-Bus link are via RJ10 pre-terminated communication cables. Available
communication lengths are: 400mm, 2m, 5m, 10m, 15m.
The Sentinels units are daisy-chained on S-Bus, as well as I-Links modules (if more than one
unit is used) on I-Bus.

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2.1 Communication
The LEM proprietary communication bus is generally referred to as S-Bus or I-Bus, dedicated
link for I-Link modules. In practice, both have exactly same characteristics and function in the
same way.
Based on serial full duplex communication, each device has an unique ID, 001-254, which
identifies it on the appropriate bus.
The link is a 4-wires one (Rx, Tx, 2xGnd) and is able to support 125 devices with correct
network performance.
The transmission speed is 9600 baud, with no flow control and following data frame:
Start bits: 1
Stop bits: 1
Data bits: 8
Parity: None
The electrical interface is custom designed. For this reason, it is not possible to directly
connect Sentinel or I-Link device to the OCS. A LEM-supplied Bus Converter module is
needed; it is in charge of generating the correct signal levels (note: no software protocol
translation is performed).
The device is instructed by means of a command set addressed to the unit and provides data and status
information in the form of a response set. It never analyzes the measured parameter by itself. It doesn’t
make an unsolicited or spontaneous transmission to the network. The only exception is a “READY”
announcement following a successful start-up (detailed in 3.2)

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2.2 Sentinel device
The Sentinel device is a digital transducer, which measures Voltage, Temperature and
Impedance of a 'Standby' Battery. Two types of modules exist: one for low voltage 2V bloc,
another one for high voltage (6V or 12V).
Mechanical drawings:
The module is equipped with two S-Bus ports (refer front view), internally connected in parallel
and with a power & sense connector (on rear view) towards the battery bloc:
2: Power –ve 1: Sense +ve
4: Sense -ve 3: Power +ve
0V 0V
RX TX
0V 0V
RX TX
S-Bus port
Care must be taken to connect the Sentinel to the positive and negative terminals of the bloc
correctly. Reversal of these leads may damage the Sentinel.
It must put on a clean and plane bloc area and fixed to it thanks to the ‘double-sided’ tape on
its back. Take care to place the Sentinel in order its LED on left side being easily seen.
The Sentinel module is sealed to comply with the relevant health and safety standards; under
no circumstances must it be opened. No object must be inserted into the module other than
the specified connectors. If this condition is not complied with, all warranties and compliance
are void.
Top view
Front view
Side view
Rear view

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2.3 I-Link device
The I-Link device is attached to a LEM current transducer (CT) whose output signal is
measured and converted, for the purposes of transmission over the I-BUS.
It is designed to accommodate up to 2 current sensors: a combined charge/discharge sensor,
and a separate ‘float’ (trickle) sensor.
The I-Link module can be fixed on a wall or panel with two screws (M4), using max. fastening
torque 2.8 Nm or mounted on a metallic DIN Rail thanks to the clip on its back.
Mechanical drawings:
The module is 34.8 mm thick.
Cables are about 50 cm long
It requires external power supply in range 18-34V.
Connection toward power supply:
Wire colour Meaning
Red Power Supply (18-34V)
Black Ground
Connection toward CT: Wire colour Meaning
Red Power Supply +15V
Dark blue Power Supply –15V
Yellow CT output
Black CT return (0V)
In the large offer of LEM current transducers, some products are more suitable for
charge/discharge measurement (bipolar and large range).
1
3
2
Cables identification:
1: CHRG/DIS CT
2: POWER Supply
3: FLOAT CT

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By default, I-Link device is set to accept maximal CT output voltage of 4V. Anyway, on special
request, it can be set to accept 8V: this must be specified when ordered.
At this present moment, LEM recommends the following current sensors.
-For use with cables:
HTA family : 32mm round aperture, available in 100, 200, 300, 400, 500, 600 and 1000 A
versions.
HTR family : split-core for retrofit applications. Available in 50, 100, 200, 300, 400 and 500 A.
-For use with bus bars:
HAX family : large 64 x 21 mm rectangular aperture. Available in 500, 600, 850, 1000, 1200,
1500, 2000 and 2500 A versions for larger applications.
HOP family : rectangular aperture and split-core for retrofit. Available in 500, 800, 1000, 1500
and 2000 A versions
All the data sheets are available on LEM web-site.
2.4 S-Bus converter
The S-Bus converter is designed to convert the LEM proprietary Sentinel & I-Link
communication bus (S-Bus) to RS232 interface. Note, the module only acts on signal levels
conversion, no software protocol translation is performed.
The 25-pin connector is a standard (RS232) configuration and may be directly connected to
the serial port of a personal computer. Additional input power supply (7-12V), 500 mA min is
required.
Bottom
Front view
Side view
Rear view

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3PROTOCOL
3.1 Command
The Sentinel or I-Link unit expects commands from another compatible device such as a
system controller attached to the network to be issued to it in 3 -byte packets, sent in big-
endian format (MSB first) and accepts:
-all commands with its unique ID,
-some commands (see below) with a broadcast ID (=255) designated as global which
is destined for all units on the network.
byte1 byte2 byte3
Address/ID Instruction Checksum
byte1 : Address/ID
Up to 254 modules can be present on the bus, each with unique bus address/ID.
This byte specifies the target.
byte1 value
meaning
0x00 Command for unit #0; all units have default ID to 0 from factory
0x01
..
..
0xFE
Command for unit #1
..
..
Command for unit #254
0xFF Command is for ALL units (broadcast); used only with specific Instruction
byte2 : Instruction
This byte specifies the action to be performed by the addressed unit.