Important notes
Device protection
5.1
5.1.2

5.1−3
EDSVF9383V EN 7.1−04/2012
5.1.2 Device protection
Æ’ In the event of condensation, connect the controller to the mains
voltage only after the humidity has evaporated.
Æ’ The controller is protected by external fuses.
Æ’ Length of the screws for connecting the shield sheet for the control
cables: 12 mm.
Æ’ Cyclic connection and disconnection of the supply voltage can overload
and destroy the input current limitation of the controller. In case of
cyclic mains switching over a longer period of time, the controller must
not be switched on more frequently than every 5 minutes!
Æ’ Switching on the motor side of the controller is only permitted for
emergency switch−off.
Æ’ Provide unused control inputs and outputs with terminal strips. Cover
unused Sub−D sockets with protective covers included in the scope of
supply.
5.1.3 Motor protection
Æ’ Extensive protection against overload:
– By overcurrent relays or temperature monitoring.
– We recommend the use of PTC thermistors or thermostats to monitor
the motor temperature.
– PTC thermistors or thermostats can be connected to the controller.
– For monitoring the motor, we recommend the use of the I
2
xt
monitoring.
Æ’ Only use motors with an insulation suitable for the inverter operation:
– Insulation resistance: min. û = 1.5 kV, min. du/dt = 5 kV/ms
– When using motors with an unknown insulation resistance, please
contact your motor supplier.
 Note!
To avoid bearing currents, Lenze recommends to use motors
with insulated non−drive end bearings. Optionally, motor chokes
can be used to reduce bearing currents.
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