54 Unidrive M / HS Frame 7 to 10 Power Installation Guide
Issue Number: 5
4.1.1 Ground connections
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.
On size 7, the supply and motor ground connections are made using the M8 studs located by the
supply and motor connection terminals. Refer to Figure 4-1.
On size 8, the supply and motor ground connections are made using the M10 studs located by the
supply and motor connection terminals. Refer to Figure 4-1.
On size 9A, the supply and motor ground connections are made using the M10 studs located by the
supply and motor connection terminals. Refer to Figure 4-2.
On size 9E and 10E, the supply and motor ground connections are made using the M10 studs
located by the supply and motor connection terminals. Refer to Figure 4-3.
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 %
575 V drive: 500 V to 575 V ±10 %
690 V drive: 500 V to 690 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
Electrochemical corrosion of grounding terminals
Ensure that grounding terminals are protected against corrosion i.e. as could be caused
by condensation.
For further information on ground cable sizes, refer to Table 2-5 Protective ground cable
ratings on page 14.
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.
Model Symmetrical fault level (kA)
All 100
Unidrive M frame7 to 10 Power Installation Guide issue5.book Page 54 Tuesday, May 24, 2016 11:52 AM
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