Nidec Unidrive M600 Series - 6.1.2 Ground connections

Safety
information
Introduction
Product
Information
System
design
Mechanical
Installation
Electrical
Installation
Getting
started
Optimization Parameters
Technical
data
Component
sizing
Diagnostics
UL
Information
Unidrive M Regen Design Guide 115
Issue Number: 4
6.1.2 Ground connections
The drives in the Regen system must be connected to the system
ground of the AC power supply. The ground wiring must also conform to
local regulations and codes of practice.
Size 3 and 4
On size 3 and 4, the supply and motor ground connections are made
using the M4 studs located either side of the drive near the plug-in power
connectors. Refer to Figure 6-10 on page 115.
Size 5
On size 5, the supply and motor ground connections are made using the
M5 studs located near the plug-in power connector. See Figure 6-11 for
details.
Size 6
On a size 6, the supply and motor ground connections are made using
the M6 studs located above the supply and motor terminals.
See Figure 6-12 for details.
Size 7 to 10
On size 7, the supply and motor ground connections are made using the
M8 studs located by the supply and motor connection terminals.
On size 8 to 10, the supply and motor ground connections are made
using the M10 studs located by the supply and motor connection
terminals. See Figure 6-13.
Size 11D
On a Unidrive M 11D, the supply and motor ground connections are
made using an M10 bolt at the top (supply) and bottom (motor) of the
drive. See Figure 6-14.
Rectifier
On a size 10 or 11 rectifier, the supply and DC bus ground connections
are made using an M10 bolt at the top (supply) and bottom (DC bus) of
the drive. See Figure 6-15 and Figure 6-16.
The supply ground and motor ground connections to the following drives
are connected internally by a copper conductor with a cross-sectional
area given below:
If the necessary conditions are not met, an additional ground connection
must be provided to link the motor circuit ground and the supply ground.
Figure 6-10 Unidrive M size 3 and 4 ground connections
1. Ground connection studs.
2. Additional ground connection.
Figure 6-11 Unidrive M size 5 ground connections
1. Ground connection studs.
Figure 6-12 Unidrive M size 6 ground connections
1. Ground connection studs.
Electrochemical corrosion of earthing terminals
Ensure that grounding terminals are protected against
corrosion i.e. as could be caused by condensation.
Frame size
Cable cross sectional area
mm²
9A/9D/10D 46
Frame 10 rectifier 32
11D 42
Frame 11 rectifier (6 pulse) 64
The ground loop impedance must conform to the
requirements of local safety regulations.
The drive must be grounded by a connection capable of
carrying the prospective fault current until the protective
device (fuse, etc.) disconnects the AC supply.
The ground connections must be inspected and tested at
appropriate intervals.
WARNING
WARNING
3
1
1
2
2
1
4
1
1