Nidec DFS 1, Руководство по установке электроустановки

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DFS1/DFS2 Power Installation Guide
51
Issue Number: 2
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Terminal block in the enclosure
The motor cable shields should be bonded to a back-plate using uninsulated metal cable-clamps
which should be positioned as close as possible to the terminal block. Keep the length of power
conductors to a minimum and ensure that all sensitive equipment and circuits are at least 0.3 m
(12 in) away from the terminal block.
Figure 4-11 Installing a terminal block in the motor cable
Using a motor isolator/disconnect-switch
The motor cable shields should be connected by a very short conductor having a low inductance.
The use of a flat metal coupling-bar is recommended; conventional wire is not suitable.
The shields should be bonded directly to the coupling-bar using uninsulated metal cable-clamps.
Keep the length of the exposed power conductors to a minimum and ensure that all sensitive
equipment and circuits are at least 0.3 m (12 in) away.
The coupling-bar may be grounded to a known low-impedance ground nearby, for example a large
metallic structure which is connected closely to the drive ground.
Figure 4-12 Connecting the motor cable to an isolator/disconnect switch
4.22.6 Surge immunity of control circuits
The input/output ports for the control circuits are designed for general use within machines and small
systems without any special precautions.
These circuits meet the requirements of EN 61000-6-2:2005 (1 kV surge) provided the 0 V
connection is not grounded.
From the Drive
To the motor
Back-plate
Enclosure
Isolator
Coupling bar
From the
Drive
To the
motor
(If required)