Safety vacon • 9
Local contacts: http://drives.danfoss.com/danfoss-drives/local-contacts/
1
a) The protective grounding conductor must have a cross-sectional area of minimum 10 mm
2
Cu or 16 mm
2
Al. OR
b) There must be an automatic disconnection of the mains, if the protective grounding
conductor breaks. See Chapter 6. OR
c) There must be a terminal for a second protective grounding conductor in the same cross-
sectional area as the first protective grounding conductor.
The values of the table are valid only if the protective grounding conductor is made of the same
metal as the phase conductors. If this is not so, the cross-sectional area of the protective grounding
conductor must be determined in a manner that produces a conductance equivalent to that which
results from the application of this table.
The cross-sectional area of each protective grounding conductor that is not a part of the mains cable
or the cable enclosure, must be a minimum of:
•2.5 mm
2
if there is mechanical protection, and
•4 mm
2
if there is not mechanical protection. If you have cord-connected equipment, make
sure that the protective grounding conductor in the cord is the last conductor to be
interrupted, if the strain-relief mechanism breaks.
Obey the local regulations on the minimum size of the protective grounding conductor.
Table 1. Protective grounding conductor cross-section
Cross-sectional area of the phase
conductors (S) [mm
2
]
The minimum cross-sectional area of the
protective grounding conductor in
question [mm
2
]
S ≤ 16 S
16 < S ≤ 35 16
35 < S S/2
NOTE!
Because there are high capacitive currents in the AC drive, it is possible that the
fault current protective switches do not operate correctly.
If you use a fault protection relay, it must be of at least type B, preferably B+ (accord-
ing to EN 50178), with a trip level of 300 mA. This is for fire protection, not for touch
protection in grounded systems.
The earth fault protection inside the AC drive protects only the AC drive itself against
earth faults in the motor or the motor cable. It is not intended for personal safety.
Do not do voltage withstand tests on the AC drive. The manufacturer has already
done the tests. Doing voltage withstand tests can cause damage to the drive.
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