Safety instructions
Residual hazards
2
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EDK94AMH24 DE/EN/FR/ES/IT 1.0
2.2 Residual hazards
Protection of persons
ƒ Before starting work on the controller, check that the power terminals are
deenergised
– because the power terminals U, V, W, +UG and -UG carry hazardous voltages for at
least 3 minutes after mains disconnection.
– because the power terminals U, V, W, +UG and -UG carry hazardous voltages when
the motor is stopped.
Device protection
ƒ Plug on or pull off all pluggable terminals only in deenergised condition!
ƒ Detach the controllers from their installation backplanes only in deenergised
condition!
ƒ Cyclically switching on and off of the mains voltage can overload and destroy the
input current limitation of the controller:
– In the case of cyclic mains switching for a longer time period, allow at least one
minute between two switch-on actions!
Motor protection
ƒ Depending on the controller settings, the connected motor can be overheated by:
– For instance, longer DC-braking operations.
– Longer operation of self-ventilated motors at low speed.
Protection of the machine/system
ƒ Drives can reach dangerous overspeeds (e.g. setting of high output frequencies in
connection with motors and machines unsuitable for such conditions):
– The controllers do not offer any protection against such operating conditions. Use
additional components for this purpose.
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