Lenze 9400 Manual - Manual (Page 35)

Safety instructions
Residual hazards
3
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35 EDS94SPP101 EN 7.1
3.3 Residual hazards
Protection of persons
ƒ Before working on the controller, check that no voltage is applied to the power
terminals, because
– depending on the controller - the power terminals U, V, W, +UG, -UG, Rb1 and Rb2
carry hazardous voltages for up to 3 to 20 minutes after mains disconnection.
– the power terminals L1, L2, L3; U, V, W, +UG, -UG, Rb1 and Rb2 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.