Lenze E94AMHE - Manual (Page 52)

Safety instructions
Residual hazards
2
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52 EDK94AMH24 DE/EN/FR/ES/IT 3.1
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 only in deenergised conditions from their installation
backplanes or the back panel of the control cabinet!
ƒ Cyclic switching on and off of the mains voltage can overload and destroy the input
current limitation of the controller:
– Cyclic mains switching of 5−times in 5 minutes is permissible without restrictions.
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.