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Unidrive SP Regen Installation Guide
73
Issue Number: 2 www.controltechniques.com
6.1.2 Ground connections
Size 1
On a Unidrive SP size 1, the supply and motor ground connections are
made using the studs located either side of the drive near the plug-in
power connector. Refer to Figure 6-1 on page 66.
Size 2
On a Unidrive SP size 2, the supply and motor ground connections are
made using the grounding bridge that locates at the bottom of the drive.
See Figure 6-8 for details.
Size 3
On a Unidrive SP size 3, the supply and motor ground connections are
made using an M6 nut and bolt that locates in the fork protruding from
the heatsink between the AC supply and motor output terminals. See
Figure 6-9 for details.
Size 4, 5, 6, SPMA and SPMD
On a Unidrive SP size 4, 5, 6, SPMA and SPMD the supply and motor
ground connections are made using an M10 bolt at the top (supply) and
bottom (motor) of the drive. See Figure 6-10.
The supply ground and motor ground connections to the drive are
connected internally by a copper conductor with a cross-sectional area
given below:
Size 4: 19.2mm
2
(0.03in
2
, or slightly bigger than 6 AWG)
Size 5: 60mm
2
(0.09in
2
, or slightly bigger than 1 AWG)
Size 6: 75mm
2
(0.12in
2
, or slightly bigger than 2/0 AWG)
SPMA: 75mm
2
(0.12in
2
, or slightly bigger than 2/0 AWG)
SPMD: 120mm
2
(0.18in
2
, or slightly bigger than 2 AWG)
This connection is sufficient to provide the ground (equipotential
bonding) connection for the motor circuit under the following conditions:
Table 6-1 Cables and standards
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 6-8 Unidrive SP size 2 ground connections
Figure 6-9 Unidrive SP size 3 ground connections
Standard
Conditions
IEC 60204-1 &
EN 60204-1
Supply phase conductors having cross-sectional area
not exceeding:
Size 4: 38.4mm
2
Size 5: 120mm
2
Size 6: 150mm
2
SPMA: 150mm
2
SPMD: 240mm
2
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
Plain washers
Spring washer
M6 bolt
Summary of Contents for SP1201
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