Protection Of The Controller; Motor Protection - Lenze 9300 Manual

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4.2.2
4.2.3

Protection of the controller

Stop!
The controllers contain electrostatically sensitive components.
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Prior to assembly and service operations, the personnel must be free of electrostatic charge:
– Discharging is possible by touching the PE fixing screw or another grounded metal part in
the control cabinet.
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Length of the screws for the connection to the screen cable/screen plate for the types 9327
to 9332: < 12 mm
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Controller protection by means of external fuxes.
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Protect unused control inputs and outputs with plugs or covers (included in the contents of
delivery) for the Sub-D inputs.
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Frequent mains switching can overload the internal switch-on current limitation. For cyclic
mains switching, the controller can be switched on every three minutes as a maximum.
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The controllers 9324, 9326, 9328 and 9329 must only be operated with appropriate mains
filters.
( 3-7)
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In case of condensation, connect the controller to the mains voltage only after the visible
humidity has evaporated.

Motor protection

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Complete motor protection according to VDE:
– By overcurrent relays or temperature monitoring.
– required for group drives (motors connected in parallel to controller)
– We recommend the use of PTC thermistors or thermostats with PTC characteristic to
monitor the motor temperature.
Stop!
As standard Lenze three-phase AC motors are equipped with PTC thermistors. If motors from other
manufacturers are used, carry out all steps required for the adaptation to the controller.
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When using motors with insulation which is not suitable for inverter operation:
– Please contact your motor supplier.
Lenze AC motors are designed for inverter operation.
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With the corresponding parameter setting, the controllers generate field frequencies up to
600 Hz:
– When operating inappropriate motors, dangerous overspeeds may occur and result in the
destruction of the motor.
SHB9300CRV EN 2.0
Installation
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( 3-6)
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