Ac Supply Requirements - Emerson Unidrive M700 Installation Manual

4.1.1 Ground connections
Electrochemical corrosion of grounding terminals
Ensure that grounding terminals are protected against corrosion i.e. as could be caused
by condensation.
WARNING
The drive must be connected to the system ground of the AC supply. The ground wiring must
conform to local regulations and codes of practice.
For further information on ground cable sizes, refer to Table 2-3 Protective ground cable
NOTE
ratings on page 14.
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. See Figure 4-1 and Figure 4-2 for details.
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.
WARNING
The ground connections must be inspected and tested at appropriate intervals.
4.2

AC Supply requirements

AC supply voltage:
200 V drive: 200 V to 240 V ±10 %
400 V drive: 380 V to 480 V ±10 %
Number of phases: 3
Maximum supply imbalance: 2 % negative phase sequence (equivalent to 3 % voltage imbalance
between phases).
Frequency range: 45 to 66 Hz
For UL compliance only, the maximum supply symmetrical fault current must be limited to 100 kA
Table 4-1 Supply fault current used to calculate maximum input currents
Model
4.2.1 Supply types
All drives are suitable for use on any supply type i.e TN-S, TN-C-S, TT and IT. 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.
Operation with IT (ungrounded) supplies:
Special attention is required when using internal or external EMC filters with ungrounded
supplies, because in the event of a ground (earth) fault in the motor circuit the drive may
not trip and the filter could be over-stressed. In this case, either the filter must not be
WARNING
used (removed) or additional independent motor ground fault protection must be
provided. For instructions on removal, refer to Figure 4-11 and Figure 4-12 on page 66.
For details of ground fault protection contact the supplier of the drive.
48
All
Unidrive M/HS Frame 3 and 4 Power Installation Guide
Symmetrical fault level (kA)
100
Issue Number: 3