Residual Hazards; Motor Protection - Lenze 9400 E94BSHE Série Instructions De Montage

3.2

Residual hazards

Protection of persons
Before working on the controller, check if no voltage is applied to the power
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terminals because
– because the power terminals U, V, W, +UG, −UG, Rb1 and Rb2 carry hazardous
voltages for up to 30 minutes after power−off depending on the device.
– the power terminals L1, L2, L3; U, V, W, +UG, −UG, Rb1 and Rb2 carry hazardous
voltages when the motor is stopped.
Device protection
Plug on or pull off all pluggable terminals only in deenergised condition!
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Detach the controllers only in deenergised conditions from their installation
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backplanes or the back panel of the control cabinet!
Cyclic switching on and off of the mains voltage can overload and destroy the input
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current limitation of the controller:
– Cyclic mains switching of 5−times in 5 minutes is permissible without restrictions.

Motor protection

Depending on the controller settings, the connected motor can be overheated by:
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– For instance, longer DC−braking operations.
– Longer operation of self−ventilated motors at low speed.
Protection of the machine/system
Drives can reach dangerous overspeeds (e.g. setting of high output frequencies in
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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.
EDK94SH366 DE/EN/FR/ES/IT 7.0
Safety instructions
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Residual hazards
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