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DFS1/DFS2 Power Installation Guide
Issue Number: 2
4.5
Ground connections
4.6
Upstream protection
Figure 4-5 Upstream protection label
Ground connections
The equipment must be grounded (earthed). The wiring must conform to local regulations
and codes of practice. This is the responsibility of the installer.
The ground loop impedance must conform to the requirements of local safety regulations.
The grounded connection must be capable of carrying the prospective fault current until
the protective device (fuse, etc.) disconnects the AC supply.
The cross-sectional area of the Ground (Earth) conductor must be not less than half the
cross-sectional area of the input phase conductors.
The ground connections must be inspected and tested at appropriate intervals.
Electrochemical corrosion of grounding terminals
Ensure that grounding terminals are protected against corrosion, for example caused
by condensation.
It is necessary to install upstream fuses to protect the supply cables from overload and
fire. The recommended fuse types and current ratings are marked on the Upstream
Protection label fixed to the outside of the drive enclosure (See Figure 4-5).
Upstream fuse ratings for all DFS drives are shown in Table 4-2. The fuse voltage rating
must be suitable for the drive supply voltage.
WARNING
WARNING
WARNING
Summary of Contents for DFS 1
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