Protection Of The Controller - Lenze 4800 Manual

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4.2.2

Protection of the controller

Stop!
The controllers contain electrostatically sensitive components:
Prior to assembly and service operations, the personnel must be free of
electrostatic charge, e.g. by touching the PE fixing screw or other grounded metal
surfaces in the control cabinet.
( In the event of condensation, connect the controller to the mains voltage
( The controllers are designed for operation with a neutral earth mains
( For separate supply of the field controller:
( The power outputs of the controller for the armature circuit (A, B) and the
( Use the prescribed semiconductor fuses to protect the thyristors in the
( For speed control with incremental encoder:
( For speed control with tacho:
4.2.3 Screening of the control cables
Wire the screening and the GND and PE connections very carefully to avoid
interference. Interference in the control cables can interrupt operation, because it
disturbs the controller program (fault message 'CCr').
( Screening of control cables.
( Prevent breaks in the screening:
( Control cables must not be installed parallel to motor cables carrying
only after the visible humidity has evaporated.
voltage.
- Ensure correct phase connection of the terminals L1.1 and L3.1. The PEN
conductor must never be connected!
field circuit (I, K) must only be disconnected when no voltage is applied.
power stage (see chapter 13.1).
- Only use incremental encoders with pulse tracks shifted by 90•.
- Only use DC tacho generators.
- Connect the screen of the control cables to the screen connections of the
controller or via the isolated earthing bus in the control cabinet (e.g. PE
terminals).
- In the event of interruption, screening must be connected to protective
buses (terminal strips, relays, fuses).
- Low-resistance connection between buses (at least 10 mm
the supply.
interference.
- If it is not possible to ensure an installation distance between control and
motor cables, the motor cables should be screened.
Installation
2
) and PE of
48XX/49XXSHB0399
4-3