Hengstler Signo 721.2 Benutzerhandbuch Seite 95

• To ensure proper protection of terminals against hand contact, make sure that the live conductors are
properly connected to the terminals.
• Do not establish any connections with non-allocated ("NC") terminals.
• Counters may only be operated in a properly installed condition.
• If safe operation seems to be impaired, make the counter inoperable and secure it against inadvertent
operation.
• The installation and wiring environment has considerable impact on the electromagnetic compatibility of the
counter. Therefore, electromagnetic compatibility of the entire plant has to be ensured during the installation.
• The fabricator of these complete units or systems takes responsibility for conforming to theCE Directive.
• In areas presenting the risk of ESD (electrostatic discharge), make sure to use ESD-protected plugs and
switches during the installation.
• If the functions "prescaler input", "preset input", "correction value" and "key reset" are not allowed 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.
• In oily environments a delamination of the front sheet is possible. Therewith the tightness of the counter may
be affected. We suggest to use a protection cover as a countermeasure (see chapter 7, 9 and 14).
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2 Safety