Installation
4-11
L MA9300PLC EN 1.4
4.2.2 Controller protection
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 earthed metal part in the control
cabinet.
• Length of the screws for the connection to the screen cable/screen plate for the types 9327
to 9332: < 12 mm
• Controller protection by means of external fuses. (^ 3-7)
• 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.
(^ 3-8)
• In case of condensation, connect the controller to the mains voltage only after the visible
humidity has evaporated.
4.2.3 Motor protection
• Complete motor protection according to VDE:
– By overcurrent relays or temperature monitoring
– We recommend to use a PTC or thermostat with PTC characteristic for temperature
monitoring of the motor.
Stop!
Lenze three-phase motors are equipped with PTCs as a standard. When using motors of other
manufacturers, please carry out the measures required for the adaptation to the controller.
(^ 4-28)
• 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.
• 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 drive.
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