Lenze 9300 - Protection of the Controller

Installation
4-11
L EDSVS9332P-B EN 3.0
4.2.2 Protection of the controller
Stop!
Controllers contain electrostatically sensitive components.
• Prior to assembly and service operations, the personnel must be free of electrostatic charge:
– Discharge by touching the PE fixing screw or another grounded metal part in the control
cabinet.
• Length of the screws for the connection to the shield cable/shield sheet for the types 9327 to
9332: < 12 mm
• Controller protection by means of external fuses. (E 3-6)
• Protect unused control inputs and outputs with plugs or covers (included in the contents of
delivery) for the Sub-D inputs.
• 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.
• The controllers 9324, 9326, 9328 and 9329 must only be operated with the appropriate mains
filters.
(E 3-7)
• In case of condensation, connect the controller to the mains voltage only after the visible
humidity has evaporated.
4.2.3 Motor protection
• Extensive protection against overload:
– By means of overcurrent relay or temperature monitoring.
– We recommend to use a PTC thermistor or thermal contact (NC contact) for motor
temperature monitoring. (Lenze three-phase AC motors are provided with thermal contacts
as standard).
– PTC thermistors or thermal contacts (NC contact) can be connected to the controller.
• Onlyusemotorswithaninsulationsuitableforinverteroperation.
– Insulation resistance: max. û =1.5kV,max.du/dt=5kV/µs
– Lenze three-phase AC motors are designed for inverter operation.
– When using motors not suitable for inverter operation, please contact your motor supplier.
4.2.4 Mains types/mains conditions
Please observe the restrictions of each mains type!
Mains Operation of the controllers Notes
With earthed neutral No restrictions Comply with controller ratings
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(TT/TN systems)
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• Effective mains current: E 3- 3
With insulated neutral
(IT systems)
Possible if the controller is protected in the event of an
earth fault in the mains supply
• by means of suitable equipment for detecting an
earth fault and
• the controller is disconnected directly from the
mains
In the event of an earth fault at the inverter output, safe
operation cannot be guaranteed.
With earthed phase Operation is only possible with one variant Contact Lenze
DC supply via +U G /-U G The DC voltage must be symmetrical to PE Controller will be destroyed when earthing +U G
conductor or -U G conductor
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