Digitax ST Installation Guide 29
Issue: 7
Safety Information Introduction Mechanical Installation
Electrical Installation
UL Listing Information
An MCB (miniature circuit breaker) may be used in place of fuses under the following
conditions:
• The fault-clearing capacity must be sufficient for the installation
•The I
2
T rating of the MCB must be less than or equal to that of the fuse rating listed above
For a parallel DC bus system the maximum AC input fusing is shown in Table 4-2 below.
Table 4-2 Maximum AC input fusing
4.4 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.
The supply and motor ground connections are made using the M6 threaded hole in the
metal back plate of the drive located at the top and bottom of the drive. See Figure 4-2
for details.
Figure 4-2 Ground connection
Model
Fuse Rating
IEC class gG
Fuse Rating
Class CC
Input cable size
AAmm
2
AWG
All 20 20 4.0 12
Refer to the supplier of your drive for further information regarding DC bus paralleling.
Electrochemical corrosion of earthing terminals
Ensure that grounding terminals are protected against corrosion i.e. as could be caused
by condensation.
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.
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