8643 - 7
english
3
SAFETY PRECAUTIONS
DANGER!
Hazard due to electrical voltage in the system!
Working on the unit involves acute risk of injury.
• Before starting work, be sure to switch off the supply voltage and
secure it to prevent restarting!
• Observe all applicable accident prevention and safety regulations for
electrical equipment!
Danger from using the Power I/O Box Type 8643 in unauthorized
ambient temperature ranges!
Hazardous situations may arise due to use in unauthorized ambient tem-
perature ranges, especially in potentially explosive environments.
• Remain within the appropriate ambient temperature range, for each
type (e. g. 8643-4-AL-KS-F-I/O), according to the table in the EC-Type
Examination Certificate
.
Hazard due to unauthorized combination of types of ignition protec-
tion!
Hazardous situations may arise due to unauthorized combination of differ-
ent types of ignition protection!
• Once the bus supply has been used in an increased ignition protection
class (e), the bus supply may no longer be done at the intrinsical stand-
ard ignition protection class (i).
WARNING!
Unintentional operations or unauthorized tampering can lead to gen-
erally dangerous situations including personal injury.
• Take suitable measures to prevent unintentional operation or unauthor-
ized tampering!
Dangerous situations may occur during installation and maintenance
work.
• This work may only be carried out by authorized service personnel using
appropriate tools!
• After an interruption of the electricity or compressed air supply, ensure
that the process is re-started in a dened or controlled manner!