The 800-CT24 current measuring module is an expansion module designed for use with Janitza's 800 series basic devices, specifically the UMG 801 (from FW 1.5.0) which supports 10 slots, with the 800-CT24 module occupying 3 slots. This module extends the functional range of the basic device by providing 24 current measuring channels. It is suitable for low-power current transformers (LP current transformers) with a secondary voltage range of 0 to 333 mV and does not measure DC currents. The module features an input and output (RJ45) for integration into a JanBus topology with a basic device, requiring at least one 800-CON-RJ45 transfer module for this purpose. It is crucial to note that the interfaces of the transfer module are proprietary RJ45 JanBus interfaces and should not be connected to RJ45 Ethernet interfaces.

Function Description:

The 800-CT24 module enables current measurement exclusively through LP current transformers. Both the LP current transformer and the primary measuring line require basic insulation in accordance with IEC 61010-1; alternatively, a double-insulated LP current transformer can be used. The module integrates into a combined JanBus topology, allowing the basic device to measure current via the connected LP current transformers. The basic device automatically recognizes the module during power-up. For optimal performance, it is important not to extend the connecting cables of the LP current transformers at the current measurement inputs, as this can influence measurement results. The maximum bus length of the JanBus topology must also be observed.

Important Technical Specifications:

Channels: 24 current measurement inputs.
Measuring Category: 300 V CAT II.
Rated Voltage for LP Current Transformers: 333 mV.
Measuring Range: 0 ... 400 mV.
Crest Factor: 1.8.
Overload for 1 s: 1 V.
Resolution: 16 bit.
Sampling Frequency: 6.8 kHz.
Frequency of the Fundamental Oscillation: 40 Hz .. 70 Hz.
Harmonics: 1 .. 15 (odd only).
Interface: RJ45 (In/Out) for JanBus (proprietary) communication via RJ45 patch cable.
Supply Voltage: 24 V (via JanBus interface).
Max. Bus Lengths/Cable Lengths of RJ45 Cables: Cat 7/7a = 100 m (AWG 22: Ø = 0.64 mm), Cat 6/6a = 75 m (AWG 23: Ø = 0.57 mm), Cat 5/5e = 60 m (AWG 24: Ø = 0.51 mm).
Current Sensor/LP Current Transformer Interface: Micro Mate-N-Lok connector.
Accuracy Class (333 mV nominal voltage):
- Total active power (P): 0.5 (IEC61557-12).
- Total reactive power (QA, Qv): 1 (IEC61557-12).
- Total apparent power (SA, Sv): 0.5 (IEC61557-12).
- Total active energy (Ea): 0.5 (IEC61557-12), 0.5S (IEC62053-22).
- Total reactive energy (ErA, ErV): 1 (IEC61557-12).
- Total apparent energy (EapA, EapV): 0.5 (IEC61557-12).
- Phase current (I): 0.5 (IEC61557-12).
- Power factor (PFA, PFV): 1 (IEC61557-12).
- Current harmonics (Ih): Cl. 1 (IEC61000-4-7).
- THD of the current (THDI): 1.0 (IEC61557-12).
Measuring Range:
- Total active power: 0.. 12.6 kW.
- Total reactive power: 0..16.6 kvar.
- Total apparent power: 0.. 12.6 KVA.
- Total active energy: 0.. 999 GWh.
- Total reactive energy: 0.. 999 Gvarh.
- Total apparent energy: 0.. 999 GVAh.
- Phase current: 0.. 424 mVrms.
- Power factor: 0.00.. 1.00.
- Current harmonics: 1 ... 15 (odd only).
- THD of the current: 0..999%.
Display Range:
- Total active power: 0.. 999 GW.
- Total reactive power: 0.. 999 Gvar.
- Total apparent power: 0.. 999 GVA.
- Total active energy: 0.. 999 GWh.
- Total reactive energy: 0.. 999 Gvarh.
- Total apparent energy: 0.. 999 GVAh.
- Phase current: 0.. 999 KA.
- Power factor: 0.00.. 1.00.
- THD of the current: 0..999%.
Net Weight: 120 g (0.26 lb).
Device Dimensions: W = 248 mm (9.76 in), H = 42 mm (1.65 in), D = 37 mm (1.46 in).
Mounting Orientation: As desired.
Fastening/Mounting: Suitable for DIN rails TS 35/7.5, TS 35/10, TS 35/15 x 1.5 according to EN 60715.
Protection against Foreign Matter and Water: IP20 according to EN60529.
Impact Resistance: IK07 according to IEC 62262.
Free Fall (Transport and Storage): 1 m (39.37 in).
Temperature (Transport and Storage): K55: -25 °C (-13 °F) to +70 °C (158 °F).
Relative Humidity (Transport and Storage): 0 to 95% at 25 °C (77 °F), no condensation.
Working Temperature (Operation): -10 °C (14 °F) .. +55 °C (131 °F).
Relative Humidity (Operation): 5 to 95% at 25 °C (77 °F), no condensation.
Pollution Degree: 2.
Ventilation: No forced ventilation required.

Usage Features:

The 800-CT24 module is designed for industrial use as an expansion module in switchboard cabinets and small distribution boards. It must only be mounted with basic devices that are disconnected from the power supply. The module's operation, configuration, and reading of measured values can be managed through several options:

Basic Device Display and Buttons: The basic device provides a user interface for direct interaction.
GridVis® Software: This network analysis and programming software offers comprehensive tools for configuration, graphical display of measured values, report functions, and online help/tutorials. It supports automatic module recognition, addition, removal, and configuration swaps within the module topology.
Device Homepage: The basic device's web server allows for analysis and configuration of essential measurement device and module parameters.
Human Machine Interface (HMI): If integrated into the project (e.g., a web panel like JPC-100), an HMI can be used to manage, monitor, and configure modules.

Module identification and diagnostics can be performed on the basic device. This involves checking communication between the basic device and the module, identifying individual or all connected modules via LED blink intervals, and viewing system information such as module type, serial number, position, hardware, and software versions. LP current transformer ratios can be configured via the basic device's user interface, the GridVis® software, or the device homepage.

Maintenance Features:

Incoming Goods Inspection: Before assembly, a visual inspection for mechanical condition and completeness of delivery is recommended.
Defective Device/Disposal: Defective devices, modules, or components should be returned to Janitza electronics GmbH in accordance with shipping instructions. Users are advised not to open or repair the device themselves, as this voids the warranty. Disposal should follow national regulations, separating electronic waste, batteries, plastics, and metals.
Module Replacement: In case of a defective module, it can be replaced with an intact one using the GridVis® software's "Module exchange" function, which transfers data from the old module to the new one.
Repair: Repairs can only be carried out by the manufacturer.
Service: For questions not covered in the manual, contact Janitza support, providing device designation, serial number, hardware/software version, measured voltage/supply voltage, and error description.
Device Adjustment: Devices are factory-adjusted and do not require readjustment under normal environmental conditions.
Calibration Interval: A recalibration is recommended after approximately 5 years, to be performed by the manufacturer or an accredited laboratory.
Firmware Update: Firmware updates for the basic device and modules can be performed via the device homepage or using the Firmware Update Assistant in the GridVis® software.
Reset to Factory Settings: This function is performed via the basic device.
Saving Measured Values and Configuration Data: The basic device stores min./max./average values and energy values every 5 minutes and saves configuration data immediately.

Safety information emphasizes the importance of electrically qualified personnel for installation and maintenance, adherence to safety regulations, and proper handling of current transformers to prevent injury or damage.

janitza 800 Series - Connection Example

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