Siemens 3RK1408-8K.00-0AA2

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S22,5 Modul zur Erdschlusserkennung

in AS-Interface-Netzen

S22.5 Module for ground-fault detection

in AS-Interface networks

3RK1408-8K.00-0AA2

Betriebsanleitung / Operating Instructions

NEB333043050000/RS-AA/003 Last update: 08 August 2022

3RK1701-2KB08-0AA1

Das Modul zur Erdschlusserkennung erkennt und meldet eine

Verbindung von positivem oder negativem AS-Interface-Potential mit

dem an Klemme 2 angeschlossenen Anlagenpotential.

Externe Hilfsspannungen werden mit diesem Modul nicht

erdschlussüberwacht.

Dieses Modul ist nicht verwendbar, wenn Module mit galvanischer

Verbindung zu AS-Interface-Potentialen (auch hochohmig) im

AS-Interface-Netz montiert sind.

Überprüfen Sie regelmäßig die Funktion des Moduls:

• Bei kurzer Betätigung (< 2 s) des TEST/RESET Tasters wird ein

Erdschluss simuliert und der FAULT-Ausgang gesetzt. Dieser

Zustand bleibt gespeichert, bis durch eine Betätigung des TEST/

RESET Tasters (> 2 s) ein Reset durchgeführt wird. Dadurch wird

der O.K.-Ausgang gesetzt und der FAULT-Ausgang rückgesetzt.

Besteht ein Erdschluss, so ist kein Reset möglich.

• Das Modul kann auch durch einen High-Pegel am potentialfreien

Remote-Reset-Eingang (R-RES) rückgesetzt werden. Auch hier ist

kein Reset möglich, wenn ein Erdschluss besteht.

Die Testfunktion erzeugt einen Erdschluss.

Bringen Sie die Anlage vor dem Test in einen sicheren Zustand!

Deutsch

GEFAHR

Gefährliche Spannung. Lebensgefahr oder schwere

Verletzungsgefahr.

Vor Beginn der Arbeiten Anlage und Gerät spannungsfrei schalten.

Die Installations- und Wartungsarbeiten an diesem Gerät und die

Außerbetriebnahme dürfen nur von einer autorisierten

Elektrofachkraft ausgeführt werden.

Anwendungsbereiche

Hinweis

Test/Reset des Moduls

Achtung

The ground-fault detection module recognizes and reports any

connection from the positive or negative AS-Interface potential to the

system potential connected via terminal 2.

This module does not monitor external auxiliary voltages for the

occurrence of ground-faults.

This module cannot be used in association with modules installed in

the AS-Interface network with electrical connection to AS-Interface

potentials (even over high impedance).

The ground-fault detection module must be checked at regular intervals

to ensure proper functioning, as follows:

• Briefly actuating the TEST/RESET button (< 2 s) simulates a ground

fault and should cause the FAULT output to be set. This status

remains stored until, by actuating the TEST/RESET button for a

longer period (> 2 s), the module is reset, thus setting the OK output

and resetting the FAULT output. So long as there is a ground fault,

reset is not possible.

• The module can also be reset by applying HIGH at the zero-potential

remote reset (R-RES) input. Here too, so long as there is a ground

fault, reset is not possible.

The test function actually does generate a ground fault.

Before commencing the test, ensure that the system is placed in a safe

condition!

English

DANGER

Hazardous voltage. Will cause death or serious injury.

Turn off and lock out all power supplying this device before

working on this device. Installation and maintenance work on

this device as well as decommissioning may only be carried out

by an authorized electrician.

Application area

Note

Testing/resetting the module

Important note

Need help?

Do you have a question about the Siemens 3RK1408-8K.00-0AA2 and is the answer not in the manual?

The Siemens S22.5 Module for ground-fault detection in AS-Interface networks, identified by part number 3RK1408-8K.00-0AA2, is a crucial component designed to enhance the safety and reliability of AS-Interface systems. This module actively monitors the AS-Interface network for ground faults, specifically detecting any connection between the positive or negative AS-Interface potential and the system potential connected via terminal 2.

Function Description:

The primary function of the S22.5 module is to provide early detection and reporting of ground faults within an AS-Interface network. A ground fault occurs when there is an unintended electrical connection between a live conductor and the earth or a grounded equipment frame. Such faults can lead to dangerous situations, including electrical shock hazards, equipment damage, and system downtime. By continuously monitoring the AS-Interface potentials against the system ground, the module can promptly identify these hazardous conditions.

Upon detecting a ground fault, the module activates its FAULT output, signaling the presence of an issue. This output can be integrated into a larger control system to trigger alarms, initiate safety shutdowns, or alert maintenance personnel. The module also features an O.K. output, which indicates normal operation when no ground fault is detected.

Important Technical Specifications:

The S22.5 module is designed for robust performance in industrial environments. Key specifications include:

Connection Terminals: The module provides terminals for AS-Interface positive and negative potentials, as well as a connection for the system potential (terminal 2). It also includes terminals for the O.K. and FAULT outputs, and a remote reset input (R-RES).
Wiring: The module supports various wire cross-sections for different connection types. For AS-Interface and auxiliary connections, it accommodates 1 x (0.5 ... 4.0) mm² or 2 x (0.5 ... 2.5) mm² wires for the 3RK1408-..E variant, and 2 x (0.25 ... 1.5) mm² for the 3RK1408-..G variant. AWG wire sizes range from 20 to 14 for the -..E variant and 24 to 16 for the -..G variant. The stripping length for wires is 5-6 mm.
Torque: Terminal screws require a tightening torque of 0.8 to 1.2 Nm (7 to 10.3 lb.in).
LED Status Indicators: The module features multiple LEDs to provide clear visual feedback on its operational status:
- AS-Interface (green): Indicates the presence or absence of AS-Interface voltage.
- O.K. (green): Lights up when no ground fault is detected and AS-Interface voltage is present.
- FAULT (red): Lights up when a ground fault is detected.
- R-RES (yellow): Indicates when the remote reset input is active.
Dimensions: The module has a compact design, with typical dimensions of 65 mm (width) for the 3RK1408-..E variant and 84.4 mm for the 3RK1408-..G variant. The height is approximately 92.2 mm for the -..E variant and 93.9 mm for the -..G variant, with a depth of about 101.6 mm for the -..E variant and 103.4 mm for the -..G variant.

Usage Features:

Ground Fault Detection: The module continuously monitors for connections between AS-Interface potentials (positive or negative) and the system potential (earth).
Status Indication: Clear LED indicators provide immediate visual feedback on the module's operational status, AS-Interface voltage presence, and ground fault detection.
Test/Reset Functionality: A built-in TEST/RESET button allows for manual testing and resetting of the module.
- Testing: A brief press (< 2 seconds) of the TEST/RESET button simulates a ground fault, activating the FAULT output. This allows for verification of the module's detection and signaling capabilities.
- Resetting: A longer press (> 2 seconds) of the TEST/RESET button resets the module, clearing the FAULT output and activating the O.K. output, provided no actual ground fault exists.
Remote Reset: The module also supports remote resetting via a potential-free R-RES input. Applying a HIGH signal to this input will reset the module, similar to the manual reset, as long as no actual ground fault is present.
Safety Warning: It is crucial to note that the test function does generate a ground fault. Therefore, the system must be brought into a safe condition before performing any tests to prevent hazardous situations.
Limitations: The module does not monitor external auxiliary voltages for ground faults. Furthermore, it cannot be used in AS-Interface networks that include modules with galvanic connections (even high impedance) to AS-Interface potentials, as this would interfere with its ground fault detection mechanism.

Maintenance Features:

Regular Function Check: It is recommended to regularly check the module's function using the TEST/RESET button to ensure its proper operation. This proactive maintenance helps confirm that the ground fault detection system is always ready to respond to actual faults.
Clear Status Indicators: The LED indicators simplify troubleshooting by providing quick visual cues about the module's state, enabling faster diagnosis of issues.
Durable Design: The module is designed for industrial use, ensuring reliability and longevity in demanding environments.
Installation and Maintenance Safety: All installation, maintenance, and decommissioning work on the device must be performed by an authorized electrician. Before any work, the system and device must be de-energized and locked out to prevent accidental power-up, adhering to critical safety protocols.

The Siemens S22.5 module is an essential safety device for AS-Interface networks, offering reliable ground fault detection and clear status indication to protect personnel and equipment. Its user-friendly test and reset features, combined with robust construction, make it a valuable component in industrial automation systems.