Safety
Information
Introduction
Product
information
System
design
Mechanical
installation
Electrical
installation
Getting
started
Optimisation
Parameters
Technical
data
Component
sizing
Diagnostics
74
Unidrive SP Regen Installation Guide
www.controltechniques.com Issue Number: 2
Figure 6-10 Unidrive SP size 4, 5, 6, SPMA and SPMD ground
connections
Figure 6-11 Unidrive SPMC/U ground connections
6.2 AC supplies
N
Drives rated for supply voltages up to 690V are suitable for use with
supply types with neutral or centre grounding i.e. TN-S, TN-C-S, TT
The following supplies are not permitted with Unidrive SP Regen
1. Corner grounded supplies (grounded Delta)
2. Ungrounded supplies (IT)
>
575V
6.2.1 Supply types
Drives are suitable for use on supplies of installation category III and
lower, according to IEC60664-1. This means they may be connected
permanently to the supply at its origin in a building, but for outdoor
installation additional over-voltage suppression (transient voltage surge
suppression) must be provided to reduce category IV to category III.
6.2.2 Dedicated supplies
The nature of the mains supply has an important effect on the EMC
arrangements. For a dedicated supply, i.e. one which has no other
electrical equipment fed from the secondary of its distribution
transformer, normally neither an EMC filter or a switching frequency filter
are required. Refer to
section 4.3.1 Omitting the switching frequency
.
6.2.3 Other supplies
Wherever other equipment shares the same low voltage supply, i.e.
400Vac, careful consideration must be given to the likely need for both
switching frequency and EMC filters, as explained in section
6.5.11
.
6.2.4 Supply voltage notching
Because of the use of input inductors and an active rectifier the drive
causes no notching - but see section 6.5.11
for advice on switching frequency emission.
6.2.5 Supply harmonics
When operated from a balanced sinusoidal three-phase supply, the
regenerative Unidrive SP generates minimal harmonic current.
Imbalance between phase voltages will cause the drive to generate
some harmonic current. Existing voltage harmonics on the power
system will cause some harmonic current to flow from the supply into the
drive. Note that this latter effect is not an emission, but it may be difficult
to distinguish between incoming and outgoing harmonic current in a site
measurement unless accurate phase angle data is available for the
harmonics. No general rule can be given for these effects, but the
generated harmonic current levels will always be small compared with
those caused by a conventional drive with rectifier input.
Supply
ground
Motor
ground
Motor
ground
Supply
ground
NOTE
Summary of Contents for SP1201
Page 219: ......
Page 220: ...0471 0029 02 ...
