ABB CMS-660 User manual

— CMS-660 User manual
—
CIRCUIT MONITORING SYSTEM
CMS-660
User manual
• Current monitoring at solar plant's string level
• Immediate detection of unusual system status (e.g. solar shading,
over-voltages, breaker trip, high temperature)
• Simplified installation thanks to quick mounting of sensors
• Smart commissioning in only a few minutes
• Easy retrofitting and upgrade thanks to the flexible, modular design

CMS-660 SYSTEM CIRCUIT MONITORING SYSTEM (CMS)
3
004 Use and Storage of the Manual
005 General Information
006 Packaging Contents
007–010 Product Overview
011–013 Components of CMS system
014–017 Installation Guide
018 Wiring Diagrams
019 Initial Commissioning
020–026 Modbus
027–029 Modbus Mapping
030 FAQ
—
Table of contents

4
CMS-660 SYSTEM CIRCUIT MONITORING SYSTEM (CMS)
—
Storing
The manual must be stored close to the device; safe from liquids and anything else which may
compromise its leggibility. The manual and the declaration of conformity are both an integral part
of the device until it is dismantled. If the manual is lost or illegible please request a copy from the
manufacturer.
Copyright
The copyright of this manual is the property of ABB Ltd. This manual contains texts, designs and
illustrations of a technical nature which must not be disclosed or transmitted to third parties, even
partially, without the written authorisation of ABB Ltd.
Liability disclaimer
The information contained in this document is subject to change without notice and cannot be
considered as an obligation by ABB Ltd. ABB Ltd. is not liable for any errors that may appear in this
document. ABB Ltd. is not liable under any circumstances for any direct, indirect, special, incidental
or consequential damage of any kind that may arise from using this document. ABB Ltd. is also not
liable for incidental or consequential damage that may arise from using the software or hardware
mentioned in this document.
Brand
ABB Ltd. is a registered trademark of ABB Group. All other brands or product names mentioned
in this document are trademarks or registered trademarks of their respective owners.
Meaning of symbols
Warning – can result in death or
serious personal injury
Non-safety related, but useful
and important information
CE conformity mark Torque
Observe the accompanying
documents
Disposal
Installation,
electrotechnical expertise
Equipment protected throughout
by reinforced insulation
—
Use and Storage of the Manual
This manual contains all of the safety information, the technical
aspects and the operating necessary to ensure the correct use of
the device and maintain it in safe conditions.

CMS-660 SYSTEM CIRCUIT MONITORING SYSTEM (CMS)
5
—
General Information
—
Cleaning
—
Safety warnings
Attention: Non-adherence to the following points can lead to serious injury or death.
Use the suitable personal protection devices and adhere to the current regulations governing
electrical safety.
This device must be installed exclusively by qualified personnel who have read all of the information
relative to the installation.
Check that the voltage on the main side is compatible with the range permitted by the device.
Ensure that all current and voltage supplies are disconnected prior to carrying out any controls,
visual inspections and tests on the device.
Always assume that all circuits are under voltage until they are completely disconnected, subjected to
tests and labelled.
Disconnect all of the power supply prior to work on the device.
Always use a suitable voltage detection device to check that the supply is interrupted.
Pay attention to any dangers and carefully check the work area ensuring that no instruments or
foreign objects have been left inside the compartment in which the device is housed.
The correct use of this device depends on a correct manipulation, installation and use.
Failure to adhere to the basic installation information can lead to injuries as well as damage to the
electric instruments or to any other product.
The tests carried out at a high voltage can damage the device's electronic components.
Disposal
Defective devices must be disposed of as special waste at the appropriate collection
points set up for this purpose. National or regional regulations on the disposal of special
waste must be followed.
Service and maintenance
The device undergoes several safety assessments before shipment and will be sealed.
If a device is opened, the safety assessments have to be repeated. A warranty will be provided
for unopened devices only.
Use a dry cloth. Ensure that the device and all related circuits are not under voltage prior to clean the
device.

6
CMS-660 SYSTEM CIRCUIT MONITORING SYSTEM (CMS)
—
Packaging Contents
Attention: The following items are not
included in the delivery of the product
1) CMS-Sensors
2) Power supply
3) CMS-Bus
4) Connector set
- Control unit (CMS-660)
- Installation manual
CMS-660
Control Unit
Status
Network
Reset
USB

CMS-660 SYSTEM CIRCUIT MONITORING SYSTEM (CMS)
7
—
Product Overview
Intended use
The system consists of a control unit and sensors.
The sensors measure alternating, direct and mixed currents (TRMS) up to 80 A and are connected to
the control unit by a flat cable, the CMS-Bus. Up to 32 sensors can be connected to each CMS-660
control unit.
The two-channel digital input allows the integration of SPD and Breaker status ensuring up-to date
information on the system. CMS-660 also allows to get the temperature value through open-core
sensors.
The measurement data can be analyzed via RS485 interface with Modbus RTU protocol.
A micro-USB port located on the front of the device is designed for configuration and operation.
The CMS-660 control unit is a measurement instrument for current
branch monitoring, up to 32 branch sensors.
CMS-Bus (32 sensors) Digital input
Micro-USB port
24 V DC Power supply
+
Serial RS485 port: Modbus RTU
CMS-660
Control Unit
Status
Network
Reset
USB

8
CMS-660 SYSTEM CIRCUIT MONITORING SYSTEM (CMS)
—
Product Overview
—
Reset button
On the front of the device, you can find a button that allows to restart and/or reset the device to
a defined condition. The reset button can be also used to restart the device, as well as initiating the
commissioning phase.
• Pressing the button for ~1 second (1 beep) restarts the device without any configuration change.
• Pressing the button for 3 to less than 6 seconds (2 beeps) restarts the device and removes all sensor
assignments.
• Pressing the button for 6 to less than 9 seconds (3 beeps) restarts the device, removes all sensor
assignments and resets all configurations, including Modbus ID (factory reset).
Do not switch off the power supply during the reset process.
—
LEDs
Two LEDs on CMS-660 indicate respectively the status of the device and the status of the network.
1. LED Status
Off Device is off
Green on Normal operation
Green slow blink Starting procedure (~ 3 sec)
Green flash Digital input status has changed
Yellow blink Configuration mode, waiting for sensor registration
Red on No sensors registered, configuration mode not active
Red blink Error, reset is necessary
2. LED Network
Off No communication
Green flash Modbus or USB communication

CMS-660 SYSTEM CIRCUIT MONITORING SYSTEM (CMS)
9
—
Product Overview
Technical specifications
—
CMS-660
CMS-660 control unit
General data
Degree of protection IP20
Operating temperature [°C] 
Storage temperature [°C] 
Dimensions W / H / D [mm] 
Weight [g] 144
Altitude [m] 
Insulation strength [V AC] 400
Installation on DIN-rail 35 mm (DIN EN 50022)
Reference standards IEC 61010-1
UL 508 / CSA C22.2 No. 14
Supply
Screw-type terminals 0.5…2.5 mm², max 0.6 Nm
Supply voltage [V DC] 24 (±10%)
Power Input [W] 0.5 - 11 (dep. on n. of sensors)
Serial interface (RS-485)
Screw-type terminals 0.5…2.5 mm², max 0.6 Nm
Serial transmission speed [kbps] 2.4 … 115.2
Cable type Twisted pair, shielded
Communication protocol Modbus RTU
CMS-Bus
Max. number of sensors 32
Refresh time 
Digital inputs 2
Connection method Push-in spring connection
Cable diameter Max. 0.5 mm²
Electrical characteristics For potential-free contact ; don't apply external voltage
Timing Status change is detected after ~0.5 sec (debounce)
Digital input 1 Pin 1 and 2
Digital input 2 Pin 3 and 4
Value 1 = external contact closed
0 = external contact open

10
CMS-660 SYSTEM CIRCUIT MONITORING SYSTEM (CMS)
—
Product Overview
Overall dimensions
87
71.8
50.5
65
21.5
43.5
45
17.7
36.2
87

CMS-660 SYSTEM CIRCUIT MONITORING SYSTEM (CMS)
11
Pushbutton
Solid-core sensor
CMS-Bus interface
LED
Opening for the electrical
conductor
—
Control unit
—
Components of CMS system
Sensor LED Status:
ON
Sensor is online and in measurement mode. There is a feature in the configuration
to switch off the LED after a specified time.
OFF
Sensor is not connected to CMS-Bus or LED is switched off.
Flashing slowly
Sensor is not assigned.
Flashing fast
Sensor is identified by the “show sensor” command.
—
CMS Sensor
Digital input port
LEDs
Reset button
CMS-Bus interface with up to 32 sensors
Micro-USB port
24 V DC external Power supply
Serial RS-485 port: Modbus RTU
Open-core sensor

12
CMS-660 SYSTEM CIRCUIT MONITORING SYSTEM (CMS)
System Pro M, SMISSLINE S800 DIN rail Cable tie
Mounting method for all MCBs, RCDs,
RCBOs with
twin terminals
for MCBs

RCBOs (SMISSLINE)
for fuse



with cage terminals
universally
usable
universally
usable
Open-core sensors

The laying method
influences the accuracy.
18-mm overall width
    -  
       
          
Solid-core sensors

18-mm overall width
        
     
       
25-mm overall width
   
   
   
* All accuracy specifications refer to the relevant full scale value and apply to 25°C
—
Sensors overview
—
Components of CMS system

CMS-660 SYSTEM CIRCUIT MONITORING SYSTEM (CMS)
13
—
Components of CMS system
—
CMS Flat Cable
The CMS flat cable is a 4-wire cable for connecting multiple sensors to one control unit. The cable
is available in the following four lengths: 2 m (CMS-800), 5 m (CMS-802), 10 m (CMS-803),
and 30 m (CMS-805).
Please take into account the following information on the possible cable length of the CMS flat cable
depending on the number and shape of sensors:
Maximum flat cable length in m
Number of sensors Solid-core sensors Open-core sensors
  
  
  
  
  
  
 
• 
wires at the far end.
• For the flat cable, please consider:
- Use within closed housings only.
- Keep a distance of min. 5.5 mm to uninsulated live parts.
- Protection class
- Where necessary, additional protection against mechanical stress or UV radiation must be ensured.
—
Connector Set
The CMS-820 connector set contains connector housings and connectors to connect
the flat cable to the sensors.
35 x connector housing 35 x connector

14
CMS-660 SYSTEM CIRCUIT MONITORING SYSTEM (CMS)
—
Warranty
Safe operation is ensured if assembly work has been carried out according to these user instructions.
Furthermore, the instructions in the manual must be observed.
Authorized Personnel
Assembly, connection, and removal work should only be carried out by authorized and qualified
personnel.
—
Assembly on 35 mm DIN-Rail
For assembly of the control unit, perform steps 1 and 2. The device can be mounted
horizontally or vertically. To dismantle perform steps 3 and 4.
The CMS-660 can be mounted on all 35mm DIN rails (DIN50022) and on SMISSLINE sockets.
—
Installation Guide
CMS
BUS
DIGITAL
INPUT
Status
Network
Reset
USB
24
1
3

CMS-660 SYSTEM CIRCUIT MONITORING SYSTEM (CMS)
15
—
Installation Guide
—
Flat Cable – Assembly of Connectors
Mark the desired placement of the connector with a pen:
1. Press the flat cable into the cable duct of the
connector housing.
2. Insert the connector into the connector
housing at the marked position.
3. Press together using parallel pliers.
Repeat the process at all other marks.
• Use the connectors only once
• Connect max. 32 sensors to the CMS-Bus interface of the control unit
• Consider the maximum flat cable length
• Flat cable should not exert force on the sensor, otherwise measuring deviations may occur
• Keep a distance of 5.5mm minimum between the flat cable and uninsulated live parts
CMS
BUS
DIGITAL
INPUT
—
Position of the Cable
The cable must not bend directly above the
sensor. If you use open-core sensors, make sure
the cable is at the correct position, otherwise
measuring deviations may occur.

16
CMS-660 SYSTEM CIRCUIT MONITORING SYSTEM (CMS)
—
Mounting of System pro M compact and SMISSLINE Sensors
• Sensors fit to all ABB installation devices with twin terminals
• Flat cable should not exert force on the sensor, otherwise measuring deviations may occur
• Sensors fit ABB MCBs (S200, SMISSLINE) and RCBOs (SMISSLINE)
• Sensors fit ABB fuseholders E90 (1000 V DC)
• Flat cable should not exert force on the sensor, otherwise measuring deviations may occur
1. Unscrew the terminal of the installation
device. Plug in the metal pin of the sensor
into rear terminal connection.
2. Put the cable through the opening of the
sensor into the installed device. The cable
has to be insulated within the sensor!
3. Then tighten the screw.
1. Insert the sensor on the existing device,
in order to have the cable passing through
the opening of the sensor.
2. Snap the adapter of the sensor on the upper
screw hole of the already installed device.
—
Installation Guide
1
4
2
3
—
Mounting Sensors on DIN-Rails
• Sensors can be mounted on all 35-mm DIN-Rails (DIN50022)
• The cable should not exert force on the sensor, otherwise measuring deviations may occur
1. Snap in the bracket on the DIN-rail.
2. Insert the cable into the installed device
through the opening on the sensor.
The cable has to be insulated within the
sensor.
3. Fix the cable with a cable tie.
4. Snap in the sensor on the bracket.

CMS-660 SYSTEM CIRCUIT MONITORING SYSTEM (CMS)
17
Attention: When plugging in the CMS flat cable on the sensors,
check the correct connection direction.
—
Installation Guide
—
Connection
Finally, connect the CMS-Sensors to the control unit.
Plug in the cable, check the correct connection direction. (Picture on the right)
✔
CMS
BUS
DIGITAL
INPUT
1
2
—
Mounting of cable tie sensors
• The cable should not exert force on the sensor, otherwise measuring deviations may occur
1. Insert the cable into the installed device
through the opening on the sensor.
2. Fix the cable with a cable tie.

18
CMS-660 SYSTEM CIRCUIT MONITORING SYSTEM (CMS)
The operations to carry out for the correct connection of the device are described in this section.
The CMS-660 control unit requires a 24 V DC external power supply.
Installation
Installation of CMS-660 to the 24 V DC supply shall include a switch or circuit breaker for the
connection to the supplying device, or the installation of the supplying device shall include a switch or
circuit breaker for the connection to mains. The switch or circuit breaker must be suitably located and
easily reachable and must be marked as the disconnecting device for the CMS-660.
Disconnection from supply or connection to supply
Switch off circuit breaker or switch before disconnecting or connecting.
Attention: The installation and the cabling of the device must be carried out by qualified personnel.
Danger of electrocution, burning and electric arc. Use the personal protection devices suitable to
adhere to the current regulations governing electrical safety. Prior to carrying out any connections
check the disconnection of the electric supply with a voltage detection device.
—
Wiring Diagrams
CMS
BUS
DIGITAL
INPUT
CMS-660
Control Unit
USB
Status
Network
Reset
RS 485 24 V DC
A B + –
6 mm 0.24 in
∅ max. 0.5 mm2 1 x AWG 26-20
8 mm 0.31 in
∅ max. 2.5 mm2 1 x AWG 20-13
0.5 – 0.6 Nm
4.4 – 5.3 lb-in
Push-in spring
connection

CMS-660 SYSTEM CIRCUIT MONITORING SYSTEM (CMS)
19
The initial commissioning of the CMS-660 control unit has to be carried out manually.
In order to guarantee a correct commissioning of the device, please follow the procedure here
described:
1. Connect the CMS-660 control unit to the external power supply: the device switches on and the
initial commissioning phase automatically begins.
2. The LED “Status” on the front of the device starts to blink in yellow, indicating no sensor is assigned
to the control unit. At the same time, the LED of each sensor is flashing slowly.
3. Assign sensors to the control unit by pressing the sensor’s pushbutton. The sensor’s LED now lights
up continuously, indicating that it is assigned.
The sensor’s ID logic follows the sensor’s assignment order: the first sensor assigned to the control
unit will have ID 1, and so on.
Once added the new sensors, please follow one of the three ways to leave the configuration mode:
• Configured timeout
• Push the reset button for < 1 sec
• Press the pushbutton of any CMS sensor already added for three times
After leaving the configuration mode the LED “Status” of the control unit is green, indicating normal
operation. If it is necessary to enter the configuration mode again after the first commissioning of the
device (e.g. one more sensor has to be assigned to the control unit), please refer to the following
instructions:
• If no sensor is assigned: press the “Reset” button for ~1 sec (1 beep) and then assign the sensors as
described above.
• If new sensors must be added to the control without changing the Modbus ID of the control unit:
press the “Reset” button from 3 to 6 sec (2 beeps) and then reassign all the sensors, including the new
ones, to the control unit as described above.
• If new sensors must be added to the control unit and all the configuration settings, including Modbus
ID of the control unit, have to be reset: press the “Reset” button from 6 to 9 sec (3 beeps). This way
the device is reset to factory conditions.
• In addition the Modbus function “Add Sensor” can be used. (page 23)
—
Initial Commissioning

20
CMS-660 SYSTEM CIRCUIT MONITORING SYSTEM (CMS)
—
Modbus
Introducing Modbus protocol
The Modbus serial line protocol is a Master-Slave protocol. This means that only one master and one or

always initiated by the master and there is only one transaction at the same time.
Modbus frame description (RTU mode)
The maximum size for a Modbus RTU frame is 256 bytes.
NOTE:
In RTU mode, message frames are separated by a silent interval of at least 3.5 character times.
The entire message frame must be transmitted as a continuous string of characters.
If a silent interval of more than 1.5 character times occurs between two characters, the message frame
is declared as incomplete and should be discarded by the receiver.
Modbus Data Encoding
Modbus uses a big-endian allocation for addresses and data items. This means that, when a numerical
quantity larger than a single byte is transmitted, the most significant byte is sent first.

—
Communication protocol
—
ADU Frame
ADU Application Data
PDU Protocol Data Unit
Stopbit 
Address Field contains the slave address
Function Code indicates what kind of action to perform
Data contains request and response parameters
CRC contains the value generated by the cyclic redundancy check (standard

Address PDU Frame Error Check
Address Field Function Code Data CRC
   L, CRCH