Lenze E82MVxxx_4Bxxx - Manual (Page 75)

Safety instructions
Residual hazards
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75 EDK82MV752 DE/EN/FR 7.1
its direction of rotation for a short time.
ƒ The motec heatsink has an operating temperature > 60 °C:
– Direct skin contact with the heatsink results in burns.
Device protection
ƒ Frequent switching of the supply voltage (e.g. inching mode via mains contactor)
can overload and destroy the input current limitation of the controller:
– Wait for at least 3 minutes between two starting operations.
ƒ Only switch contactors in the motor cable when the controller is inhibited.
Otherwise ...
– monitoring functions of the controller can be activated.
– the controller can be destroyed under unfavourable operating conditions.
Motor protection
ƒ For some controller settings, the connected motor may overheat (e.g. when
operating the DC injection brake or a self−ventilated motor at low speed for longer
periods).
– Using an overcurrent relay or a temperature monitoring device provides a large
degree of protection against overload.
– We recommend to use PTC thermistors or thermal contacts for motor temperature
monitoring. (Lenze three−phase AC motors are equipped with thermal contacts
(NC contacts) as standard)
– PTC thermistors or thermal contacts can be connected to the controller.
Protection of the machine/system
ƒ Drives can attain dangerous overspeeds (e.g. setting of high output frequencies with
motors and machines not qualified for this purpose).
– The controllers do not offer any protection against these operating conditions. Use
additional components for this purpose.