janitza 800 Series Instruction manual

www.janitza.com
800-CT8-A
current measuring module
Expansion module for basic devices of the 800 series
User manual and technical data
Janitza electronics GmbH
Vor dem Polstück 6
D-35633 Lahnau
Support tel. [phone]
Email: [email protected]
www.janitza.com
Doc. no.: 2.053.091.1.a Date: 12/2023

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800-CT8-A current measuring module
(Suitable for basic devices of the 800 series)
Doc. no.: 2.053.091.1.a
Date: 12/2023
The German version is the original edition of the documentation
Suitable basic devices and number of module slots:
Suitable basic devices /
Number of free slots
Slot assignment of an 800-CT8-A
module on the basic device
UMG801 (from FW 1.5.0) / 10 slots 1 slot
Tab. Suitable basic devices

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Subject to technical alterations.
The contents of our documentation have been compiled with great care and reflect the current state of the
information available to us. Nonetheless, we wish to point out that updates of this document are not always
possible at the same time as technical refinements are implemented in our products. Please see our website
under www.janitza.com for the current version.
Please see our website under www.janitza.com for the current version.
Information about the GridVis®software.
Janipedia: wiki.janitza.de
Tutorials: youtube.com/@gridvis

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Table of Contents
1. Information on the devices and the user manual 8
1.1 Disclaimer 8
1.2 Copyright notice 8
1.3 Technical changes 8
1.4 About this user manual 8
1.5 Defective device/disposal 9
2. Safety 10
2.1 Display of warning notices and safety information 10
2.2 Hazard levels 10
2.3 Product safety 10
2.4 Hazards when handling the device, components and modules 11
2.5 Electrically qualified personnel 12
2.6 Warranty in the event of damage 12
2.7 Safety information for handling current transformers 12
3. Product description 14
3.1 800-CT8-A current measuring module 14
3.2 Incoming goods inspection 15
3.3 Intended use 15
3.4 Overview of module functions 15
3.5 Conformity declaration 16
3.6 FCC Declaration of Conformity 16
3.7 Transformers 16
3.8 Scope of delivery 16
3.9 Operating concept 17
3.10 GridVis®network analysis software 17
4. Mounting 18
4.1 Mounting module 18
4.2 Checking the module’s communication 21
4.3 Faulty module communication 21
5. Connections/controls 22
6. Module markings – rating plate 23

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7. Installation 24
7.1 Current measurement with the module 24
7.2 Terminal assignment - connection variant 24
7.3 Example schematic diagram “Connection variants for current measurement” 25
7.4 Module identification / Diagnostics on the basic device 26
7.4.1 Entry Identify all modules 26
7.4.2 Entry Identify one module 27
7.4.3 Module identification - LED blink interval 27
8. Module communication / PC connection 28
8.1 Module communication 28
8.2 PC connection of the basic device with the current measuring module 28
8.2.1 Connection to a DHCP server and PC 28
8.2.2 PC direct connection to the basic device with current measuring module or
your module series via the Ethernet interface 28
8.3 Module communication options 29
8.3.1 Module handling in the GridVis ®software 29
8.3.2 Basic device homepage 29
9. Operation and button functions of the basic device with module 30
9.1 Operation and button functions of the basic device with module 800-CT8-A 30
9.2 Module-relevant menu items of the basic device with an 800-CT8-A module 30
10. Module-relevant configurations 34
10.1 Current transformer configuration on the basic device 34
10.2 Current transformer configuration in the GridVis®software 35
10.3 Current transformer configuration via the device homepage of the basic device 35
11. Module-relevant measuring displays 36
12. Device views 44
13. Technical data 45
13.1 Technical specifications 45
13.2 Characteristics of functions (only valid in conjunction with the UMG801 as a basic device!) 47

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14. Dismounting 48
15. Module exchange/error cases 50
15.1 Module replacement 50
15.2 Modules - Error cases 51
16. Service and maintenance 52
16.1 Repair 52
16.2 Service 52
16.3 Device adjustment 52
16.4 Calibration interval 52
16.5 Firmware update 52
16.6 Procedure in the event of a malfunction 52
16.7 Resetting the module to the standard factory settings 52
16.8 Information on saving measured values and configuration data 53

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1. Information on the devices and the user manual
1.1 Disclaimer
Compliance with the usage information for the
devices (modules/components) is a prerequisite for
safe operation and attaining the stated performance
characteristics and product features.
Janitza electronics GmbH assumes no liability for
bodily injury, material damage or financial losses
which result from disregard of the usage information.
Ensure that the usage information for the products is
legible and accessible.
1.2 Copyright notice
© 2023 - Janitza electronics GmbH - Lahnau. All
rights reserved.
Any reproduction, processing, distribution or other
use of this usage information, in whole or in part, is
prohibited.
All trademarks and the rights arising from them are
the property of the respective owners of these rights.
1.3 Technical changes
· Make sure that your device (modules/components)
matches the user manual.
· This user manual applies to the module800-CT8-A.
Separate validities and distinctions are marked.
· First make sure you have read and understood the
usage information accompanying the product.
· Keep the usage information associated with the
product available for the entire service life and pass
it on to any possible subsequent users.
· Find out about device revisions and the associated
modifications of the usage information associated
with your product at www.janitza.com.
1.4 About this user manual
If you have questions, suggestions or ideas for im-
provement of the user manual, please let us know via
email at: [email protected].
INFORMATION
This user manual describes the 800-CT8-A module
for a suitable basic device (see „Tab. Suitable basic
devices“ on p. 2) and provides information about
the operation of the devices and modules.
Also consult the additional usage information relevant
for this user manual, such as:
· the installation manual.
· the data sheet.
· the "Safety information" supplement.
· the supplement on mounting the modules.
· the usage information on the basic device and
the integrated modules of your meter and module
topology.
Moreover, the GridVis®software has an "online
help" feature.
INFORMATION
Our usage information uses the grammatical mascu-
line form in a gender-neutral sense! This form always
refers equally to women, men and diverse. In order
to make the texts more readable, distinctions are not
made. We ask for your understanding for these simpli-
fications.

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1.5 Defective device/disposal
Before sending defective devices, modules or
components back to the manufacturer for testing:
· Contact the manufacturer's Support department.
· Send devices, modules or components complete
with all accessories.
· When doing so, please bear the terms for transpor-
tation in mind.
INFORMATION
Please return defective or damaged devices, modules
or components to Janitza electronics GmbH in ac-
cordance with the shipping instructions for air or road
freight (complete with accessories).
Observe special regulations for devices with built-in
batteries or rechargeable batteries!
Do not attempt to open or repair the device (the
module, the component) on your own because oth-
erwise all warranty claims become invalid!
For the disposal of the device (the module, the
component), please observe national regulations!
Dispose of individual parts, as applicable, depending
on their composition and existing country-specific
regulations, e.g. as
· Electronic waste,
· Batteries and rechargeable batteries,
· Plastics,
· Metals.
Engage a certified disposal company to handle
scrapping as needed.
Information on "Service and maintenance" of your
device can be found in Sect. “16. Service and mainte-
nance” on p. 52.

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2. Safety
The chapter on Safety contains information which
must be observed to ensure your personal safety
and avoid material damage.
2.1 Display of warning notices and safety infor-
mation
The warning notices shown below
· are found throughout the usage information.
· can be found on the devices themselves.
· indicate potential risks and hazards,
· underscore aspects of the information provided that
clarifies or simplifies procedures.
This additional symbol on the device (module/com-
ponent) itself indicates an electrical hazard that can
lead to severe injury or death.
This general warning symbol draws attention to a
possible risk of injury. Be certain to observe all of the
information listed under this symbol in order to avoid
possible injury or even death.
2.2 Hazard levels
Warning and safety information is marked by a
warning symbol, and the hazard levels are shown as
follows, depending on the degree of hazard:
DANGER
Warns of an imminent danger which, if not avoided,
results in serious or fatal injury.
WARNING
Warns of a potentially hazardous situation which, if
not avoided, could result in serious injury or death.
CAUTION
Warns of an immediately hazardous situation which,
if not avoided, can result in minor or moderate injury.
ATTENTION
Warns of an immediately hazardous situation which,
if not avoided, can result in material or environmental
damage.
INFORMATION
Indicates procedures in which there is no hazard of
personal injury or material damage.
2.3 Product safety
The devices, components and modules reflect
current engineering practice and accepted safety
standards, but hazards can arise nonetheless.
Observe the safety regulations and warning notices.
If notices are disregarded, this can lead to personal
injury and/or damage to the product.
Every type of tampering with or use of the devices
and the modules,
· which goes beyond the mechanical, electrical or
other operating limits can lead to personal injury
and/or damage to the product;
· constitutes “misuse” and/or “negligence” under the
product’s warranty and thus voids the warranty for
any possible resulting damage.
Read and understand the user manual and the usage
information on the basic device before installing, op-
erating, maintaining and using the devices, compo-
nents and modules.
Only operate the devices, components and modules
when they are in perfect condition and in compliance
with this user manual and the usage information that
is included. Send defective devices, components
or modules back to the manufacturer in compliance
with proper transport conditions.
Retain the user manual throughout the service life of
your product and keep it at hand for consultation.
When using the device, component or module, also
observe the legal and safety regulations for your sys-
tem that are applicable for the respective use case.

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WARNING
Risk of injury due to electrical current and voltage!
Severe bodily injury or death can result! Therefore
please abide by the following:
· Do not touch bare, stripped wires or device in-
puts that are dangerous to touch on the devic-
es, components and modules.
· Switch off your installation before commenc-
ing work! Secure it against being switched on!
Check to be sure it is de-energized! Ground and
short circuit! Cover or block off adjacent live
parts!
· During operation and troubleshooting (especial-
ly with DIN rail devices), check the environment
for dangerous voltages and switch these off if
necessary!
· Wear protective clothing and protective equip-
ment in accordance with applicable guidelines
when working on electrical systems!
· Before making connections, ground the device
/ component / module by means of the ground
wire connection, if present!
· Do not touching bare or stripped leads that are
energized! Equip stranded conductors with wire
ferrules!
· Hazardous voltages can be present in all cir-
cuitry parts that are connected to the power
supply.
· Protect wires, cables and devices with a suit-
able line circuit breaker/fuse!
· Never switch off, remove or tamper with safety
devices!
· There can still be hazardous voltages present in
the device or in the component (module) even
after it has been disconnected from the supply
voltage (capacitor storage).
· Do not operate equipment with current trans-
former circuits when open.
· Only connect screw terminals with the same
number of poles and design!
· Do not exceed the limit values specified in the
user manual and on the rating plate! This must
also be observed during testing and commis-
sioning.
· Take note of the safety and warning notices
in the usage information that belongs to the
device, components or modules!
2.4 Hazards when handling the device, compo-
nents and modules
When operating electric devices, components or
modules, it is unavoidable for certain parts of these
devices to conduct hazardous voltage.
Consequently, severe bodily injury or material dam-
age can occur if they are not handled properly.
Therefore, when handling our devices, components,
or modules, always observe the following:
· Do not exceed the limit values specified in the user
manual and on the rating plate! This must also be
observed during testing and commissioning!
· Take note of the safety and warning notices in all
usage information that belongs to the device, com-
ponents or modules!
WARNING
Disregarding the connection conditions of the
Janitza measurement devices, modules or com-
ponents can lead to injuries or even death or to
material damage!
· Do not use Janitza meters, modules or compo-
nents for critical switching, control or protection
applications where the safety of persons and
property depends on this function.
· Do not carry out switching operations with the
Janitza measurement devices, modules or com-
ponents without prior inspection by your system
manager with specialist knowledge! In particular,
the safety of persons, material assets and the ap-
plicable standards must be taken into account!

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2.5 Electrically qualified personnel
To avoid bodily injury and material damage, only
electrically qualified personnel are permitted to work
on the devices and their components, modules,
assemblies, systems and current circuits who have
knowledge of:
· The national and international accident prevention
regulations.
· Safety technology standards.
· Installation, commissioning, operation, disconnec-
tion, grounding and marking of electrical equip-
ment.
· The requirements concerning personal protective
equipment.
Electrically qualified persons within the scope of the
technical safety information of all usage informa-
tion associated with the device and its components
(modules) are persons who can furnish proof of
qualification as an electrically skilled person.
WARNING
Warning against unauthorized manipulation or
improper use of the device or its components
(modules)!
Opening, dismantling or unauthorized manipulation of
the device and its components (modules) which goes
beyond the mechanical, electrical or other operating
limits indicated can lead to material damage or injury,
up to and including death.
· Only electrically qualified personnel are per-
mitted to work on the devices and their com-
ponents (modules), assemblies, systems and
current circuits.
· Always use your devices or components
(modules) only in the manner described in the
associated usage information.
· If there is discernible damage, send the device
or the component (module) back to the manu-
facturer!
2.6 Warranty in the event of damage
Any unauthorized tampering with or use of the
device, component or module constitutes “misuse”
and/or “negligence” under the product’s warranty
and thus voids the warranty for any possible re-
sulting damage. Note in this regard Sect. “3.3
Intended use” on p. 15.
2.7 Safety information for handling current
transformers
The field of transformer technology groups the
totality of all devices that perform the function of a
current, voltage or measuring transformer together
as sensors.
In the usage information for our devices, modules
and components, the terms current transformer,
voltage transformer or transformer all refer to
sensors.
A further distinction is made by the terms CT (cur-
rent transformer) and LP-CT (low-power current
transformer):
The term "current transformer" is used for special
transformers for the primary-proportional conversion
of currents of large magnitudes to directly measur-
able, smaller current values.
In contrast, the term "LP current transformer" is used
for special transformers for the primary-proportional
conversion of currents of large magnitudes to directly
measurable, lower voltage values (low power).
Current transformers and LP current transform-
ers provide safe galvanic isolation between the pri-
mary circuit and the measurement circuit due to their
design and their physical operating principle. For
Janitza measurement devices, modules and compo-
nents, use only "transformers for measuring pur-
poses" which are suitable for the energy monitoring
of your system! Observe the corresponding warning
notices (see Sect. “7.1 Current measurement with
the module” on p. 24)!
Basic devices use only the term "current transform-
er" in the display for the configuration of both cur-
rent transformers and LP current transformers.

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CAUTION
Risk of injury or damage to the meter due to high
measurement currents at the connections of the
current transformers!
High measurement currents can cause temperatures
of up to 80°C (176°F) on the connections of the
current transformers
· Use wiring that is designed for an operating
temperature of at least 80°C (176°F)!
· Ground connections present on the secondary
windings of the current transformers must be
connected to ground!
· The current transformers can be hot even after
the power supply has been switched off. Allow
the connections of the current transformers
and the connecting cables to cool down before
touching them!
CAUTION
Risk of injury or damage to the basic device (mod-
ule) and/or your system due to a short circuit!
Inadequate insulation at the current measurement in-
puts of the modules with respect to the supply circuits
of the basic device can cause dangerous voltages
at the measurement input or damage to your device
(module)/system.
· Ensure reinforced or double insulation with
respect tothe supply circuits!
WARNING
Risk of injury due to large currents and high elec-
trical voltage on the current transformers!
Current transformers operated while open on the
secondary side (high voltage peaks pose a hazard
when touched) can result in severe bodily injury or
death.
· Avoid operating the current transformers while
open; short circuit the unloaded transformers!
· Before interrupting the current supply, short
circuit the secondary connections of the cur-
rent transformers. Switch any test switches
that automatically short circuit the secondary
lines of the current transformers to the “Test”
status (Check the test switch/short circuiting
connection beforehand)!
· Only use current transformers with basic insu-
lation to IEC61010-1:2010!
· Caution, even current transformers rated as
safe for open operation can pose a hazard
when touched during operation while open!
· Make sure that screw terminals for the current
transformer connection on the device are ade-
quately tightened!
· Comply with the information and provisions in
the documentation of your current transform-
ers!

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3. Product description
3.1 800-CT8-A current measuring module
The current measuring module
· extends the functional range of the basic device
to include additional current measuring channels
(2groups of 4 current measuring channels each);
· Is suitable for current transformers with transformer
ratios of ../1A or ../5A.
Fig.: 800-CT8-A module
The basic device (see „Tab. Suitable basic devices“
on p. 2) with current measuring module measures
current exclusively via current transformers. The cur-
rent transformers require a basic insulation according
to IEC61010-1:2010 for the nominal voltage of the
circuit.
INFORMATION
When setting up your measurement device and
module topology,
note the following:
· Do not exceed the permitted number of modules
on a basic device (see usage information for the
basic device and „Tab. Suitable basic devices“ on
p. 2).
· Check that the scope of delivery of the module
includes the appropriate bus connector (JanBus
interface) for connection to the basic device.
· In addition to the current measuring module, also
read and understand the usage information for
your basic device and the current transformers!
· Do not extend the connecting cables of the LP
current transformers at the current measurement
inputs of the device/module! Extended measuring
leads can influence the measurement result!
· Do not exceed the maximum bus length of the
JanBus (see Sect. “13. Technical data” on p.
45)!
WARNING
Damage to the device/module or your installation
even including life-threatening injuries due to a
short circuit.
Insufficient insulation of the equipment (current
transformers) at the current measurement inputs
with respect to the circuits can lead to life-threaten-
ing voltages or damage to your device, module or
system.
· Observe the information and specifications for
your current transformer concerning insulation
and ensure end-to-end double insulation of
your current transformers to mains and mea-
suring circuits!
Please note Sect. “2.7 Safety information for han-
dling current transformers” on p. 12

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3.2 Incoming goods inspection
The prerequisites for trouble-free and safe operation
of the module include proper transport, storage,
setup and assembly, as well as proper operation and
maintenance.
Exercise due caution when unpacking and packing
the device, do not use force and only use suitable
tools. Check the following:
· the module by performing a visual inspection to
ensure flawless mechanical condition.
· the scope of delivery (see Sect. “3.8 Scope of deliv-
ery” on p. 16) for completeness before beginning
with assembly and installation.
If it must be assumed that safe operation of your
basic device with module is not possible:
1. Switch off the power to your system (your
device)!
2. Secure it against being switched back on!
3. Check to be sure it is de-energized!
4. Ground and short circuit the system (device)!
5. Cover or block off adjacent live parts!
Safe operation is impossible, if, for example, the
basic device with module:
· has visible damage,
· no longer functions despite an intact power supply,
· was subjected to extended periods ofunfavorable
conditions (e.g. storage outside of the permissible
climate thresholds without adjustment to the room
climate, condensation, etc.) or transport stress
(e.g. falling from anelevated position, even without
visible external damage, etc.).
ATTENTION
Improper handling may cause damage to the
module and result in material damage!
The contacts of the bus connectors (Janbus interface)
can bend or break off and destroy the bus connector.
·Never touch or manipulate the contacts of the
bus connector!
·Never force the bus connector into the module!
Please note Sect. “4. Mounting” on p. 18 in
this regard.
·When handling, transporting and storing the
module, protect the contacts of the bus con-
nector!
3.3 Intended use
The module / component
· is only for use in the industrial sector.
· is intended as an expansion module for a basic
device (see „Tab. Suitable basic devices“ on p.
2) in switchboard cabinets and small distribu-
tion boards.
· must only be mounted with a basic device that is
disconnected from the power supply (see Sect. “4.
Mounting” on p. 18).
INFORMATION
More information on certain functions of the basic
device with modules can be found in the usage
information of the basic device.
The basic device and the modules are not designed
for installation:
· In vehicles! Use of the basic device with modules in
non-stationary equipment is considered an excep-
tional environmental condition and is only permissi-
ble by special agreement.
· In environments with harmful oils, acids, gases,
vapors, dusts, radiation, etc.
· In potentially explosive environments.
3.4 Overview of module functions
Functions of the 800-CT8-A module:
· 8 current measurement inputs (2 groups of 4)
· Measuring category 300V CAT II.
· Nominal current 1A/5A configurable:
· Occupies 1 slot (module slot) of a basic device.

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3.5 Conformity declaration
The laws, standards and directives applied by Janit-
za electronics GmbH for the devices can be found in
the declarations of conformity at www.janitza.com.
The conformity of the device permits the corre-
sponding labeling.
3.6 FCC Declaration of Conformity
The device
· complies with Part 15 of the FCC Rules for Class
B digital devices (limits to protect against harmful
interference in a residential installation).
· generates, uses and can radiate high-frequency
energy
· can cause harmful interference to radio communi-
cations if not installed and used properly. There is
no guarantee that interference will not occur in a
particular installation.
If there is radio or television reception interference,
which can be determined by turning the device on
and off, proceed as follows:
· Align or reposition the receiving antenna.
· Increase the distance between the device and the
radio/television receiver.
· Connect the device and the radio/television receiver
in different circuits.
· if necessary, contact Janitza support or a radio/tele-
vision technician.
Code of Federal Regulations, Title 47, Part 15, Sub-
part B - Unintentional Radiators.
3.7 Transformers
It is not permitted to use the outputs of Janitza
measurement devices, components and modules for
switching protective devices or protective relays! Use
only "Current transformers for measuring purposes"
for Janitza measurement devices, components and
modules!
3.8 Scope of delivery
Quan-
tity Part. no. Designation
152.31.2xx 1) Module 800-CT8-A
(current measuring module)
152.31.207 4TE module bus connector
152.31.261 Accessory pack
133.03.378 Installation manual (DE/EN)
133.03.342 Supplement “Safety Information”
133.03.059 “Mounting” supplement
1) For part number see delivery note
Tab. Scope of delivery, 800-CT8-A current measuring module
INFORMATION
· The modules are supplied with the necessary con-
nection terminals (accessory pack) and bus con-
nectors (JanBus interface) for connection to a basic
device or other modules.
· Please refer to the delivery note for all options and
design variants supplied.
· The GridVis®network analysis software is available
at www.janitza.com and can be used to configure
the basic device with modules and read out data
for analysis (prerequisite: PC connection to the
basic device).

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INFORMATION
This user manual describes modules and provides in-
formation on operating the modules via a basic device.
Please refer to the user manual for the basic device for
information on operating, configuring and reading out
expansion modules.
The GridVis®software has an online help with
tutorials.
A list of parameters and Modbus addresses with
data on your basic device with module is available
for you as a download at www.janitza.com.
3.9 Operating concept
Options to configure the basic device with current
measuring module or to read measured values:
· Display and buttons on the basic device (user
interface).
· GridVis®network analysis software.
· RS-485 interface or Ethernet interface.
The modules can be used to realize meter and mod-
ule topologies with a flexible arrangement of the DIN
rails. For the operation of the devices, components
and modules integrated in your meter and module
topology, please refer to the respective additional
usage information.
3.10 GridVis®network analysis software
With the GridVis®software, you have the perfect tool
for programming, reading out and visualizing mea-
surement data (download at www.janitza.com).
Performance characteristics of the GridVis®soft-
ware
· Configuration of the basic device and the modules
of your meter and module topology.
· Graphic display of measured values.
· Online help and tutorials.
Connections to the PC (GridVis®software)
Information on connections for communication
between the PC and the basic device (with modules)
can be found in the usage information of the basic
device.

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4. Mounting
Observe the installation instructions for your ba-
sic device (e.g. check bus connector installation!)
and mount the 800-CT8-A module with the system
de-energized as follows:
1. Press in the open bottom bolts on the rear of the
module.
Fig.: Module rear view
Bottom bolts
ATTENTION
Improper handling may cause damage to the
module and result in material damage!
The contacts of the bus connectors (JanBus interface)
can bend or break off and destroy the bus connector.
·Never touch or manipulate the contacts of the
bus connector!
·Never force the bus connector into the module!
·When handling, transporting and storing the
module, protect the contacts of the bus con-
nector!
4.1 Mounting module
CAUTION
Disregard of the installation instructions may
cause property damage or personal injury!
Disregard of the installation instructions may cause
damage to your basic device with module or destroy
it and/or may also result in personal injury.
·In addition to the installation instructions for
your module, also observe the installation
instructions for your basic device, in particular
the safety and warning information.
·Before installing modules
-Disconnect the supply of power to the system!
-Secure it against being switched on!
-Check to be sure it is de-energized!
-Ground and short circuit!
-Cover or block off adjacent live parts!
·Provide adequate air circulation in your installa-
tion environment and cooling, as needed, when
the ambient temperatures are high.
· Return defective modules to Janitza electronics
GmbH in accordance with the shipping in-
structions for air or road freight (complete with
accessories).
· All usage information is available for download
at www.janitza.com.
INFORMATION
System limits:
· The maximum bus length (JanBus) for the setup of
measurement device and module topologies can
be found in the "Technical data".
· If necessary, observe the installation manual for
transfer modules when setting up decentralized
measuring concepts.
· Before mounting, please check the number of
suitable modules for your measurement device and
module topology based on the respective usage
information.
· When installing the device/module, ensure that
there is sufficient space in the installation environ-
ment. Please also note the size of the connection
terminals used!
The scope of delivery for the 800-CT8-A module can
be found in the Sect. “3.8 Scope of delivery” on p.
16. More information on certain functions of the
basic device with modules can be found in the usage
information of the basic device.
INFORMATION
· The following module assembly sequence must be
observed!
· The illustrations may differ depending on the con-
nection terminals used!

19
www.janitza.com 800-CT8-Amodule
2. If this has not yet been done, press the bus con-
nector (JanBus interface) included in the scope
of delivery into the sockets on the rear of your
module.
press
Fig.: Module rear views
3. Press the module with the bus connector onto
the DIN rail (for suitable DIN rail types, see Sect.
“13. Technical data” on p. 45) until the bottom
bolts engage (click).
Basic device
800-CT8-A module
With bus connector
click!
Bus connector
Bus connector
Twisted
Press the bus connector
contacts into the module
sockets
Bottom bolts
DIN rail
4. To couple the bus connectors (devices), push the
contacts of your module bus connector into the
sockets of the basic device bus connector (or
into the sockets of the connected module).
Internal bus connector
Basic device 800-CT8-A module
Fig.: Side view of basic device and 800-CT8-A module
Fig.: Side view of basic device and 800-CT8-A module

20
800-CT8-Amodule www.janitza.com
Mount the end bracket
or connect additional
modules of a mea-
surement device and
module topology as
needed.
800-CT8-A module
End
bracket
Fig.: Front view of the basic device, here a UMG801 with module 800-CT8-A
(Installation example - view without terminals)
Basic device
5. After successfully coupling the bus connectors
(of the devices), mount end brackets to the se-
ries of meters and modules.
6. Wire the module and apply power to the basic
device (your system).
The basic device automatically recognizes the
module during the power-up procedure!
INFORMATION
Please note the following for the setup and dimension-
ing of your measurement device and module topology:
· 1 module of type 800-CT8-A has 8 current measur-
ing channels with current measurements exclusive-
ly via current transformers (for specifications, see
Sect. “13. Technical data” on p. 45).
· For remote series of measurement devices and
modules, please note the maximum JanBus bus
length (cable lengths) in the usage information for
the transfer modules!
· Use end brackets to set up your measurement
device and module series on the DIN rails.
End
bracket