Safety Safety 2.2 Assembly, connection, programming (e.g. air ventilation).• The rules and regulations set forth by the local elec tricity providers have to be observed. These multifunctional counters are built and tested in accordance with IEC/EN 61010-1, Protection Class II – Safety Measures for Electronic Measuring Equipment. They have left the factory in a condition that is in compliance with all safety-relevant requirements. In order to maintain this condition and en sure operational safety, the User is requested to observe the safety notes and warnings given in these operating instructions! • Do not establish any connections with non-allocated (NC) terminals.
• Multifunction counters may only be operated in a properly installed condi tion. • If safe operation seems to be impaired, make the multifunctional counter inoperable and secure it against inadvertent operation. Danger! Risk of safety hazards due to incorrect/faulty as sembly and connection. • Scope of applications: industrial processes and controls. Overvoltage across the terminals must be limited to the values of overvoltage category II. • The max. operating voltages must not be exceeded! • The installation and wiring environment has considerable impact on the electromagnetic compatibility of the multifunctional counter.
Therefore, electromagnetic compatibility of the entire plant has to be ensured during the installation. • 12 – 24VDC and 24VAC multifunctional counters have to be operated at safety extra-low voltages (SELV) and under potential-compensated condi tions in order to prevent hazardous shock currents. • In areas presenting the risk of ESD (electrostatic discharge), make sure to use ESD-protected plugs and switches during the installation. • An external fuse has to be provided to protect the multifunctional counter (see Chapter 10, Technical Data). • Installation and assembly shall be carried out by skilled and trained electri cians only.
• If the functions “prescaler input”, “preset input” and “key reset” are not al lowed to be used by the machine/plant operator, access to these functions must be blocked for machine operators. Depending on the machine/plant design or concept, non-permissible input may impair the operational safety and function of the machine or plant. • Do not connect the multifunctional counter without making sure that it no longer carries any live voltages. Always separate it from the mains supply before connecting. • Make sure that live terminals are properly protected against inadvertent contact. Danger! The manufacturer of the machines / plants has to ensure, that no risks result from this.
• To ensure proper protection of terminals against hand contact, make sure that the live conductors are properly connected to the terminals. • The machine/plant manufacturer shall be responsible for the preparation of operating instructions / plant description including the following: • It‘s not allowed to use the multifunctional counter outside of the specified temperature range. If neccessary appropriate precoutions have to be applied 12 13