If overloading or a short circuit occur in the TracFeed
®
SFA, it has
to be securely switched off by a safeguard. An overcurrent protec-
tion device is installed in the TracFeed
®
SFA for this purpose. The
overcurrent protection device can only trigger if a sufficiently large
current can flow over a defined period of time. Among other fac-
tors, the size of the current depends on the earthing resistance.
Only carry out the earthing measurement in con-
sultation with the responsible energy provider com-
pany.
Personnel:
n
Qualified electrician for high and
medium voltage
Protective equip-
ment:
n
Protective clothing
n
Industrial safety helmet
n
Protective gloves
n
Safety footwear
n
High-vis clothing
Tool:
n
Measuring device for earthing resist-
ance
Requirement:
n
Before the start of measurement, the supply grid connected to
the earthing switch must be isolated.
1.
Measure the earthing resistance.
The earthing resistance must be less than
2
Ω
.
For this measurement, use a suitable meas-
uring device tested in accordance with
IEC 61557-3 (DIN EN 61577-3,
DIN VDE 0413-3).
2.
After completing the measurement, check that the earthing
switch is connected to the supply grid again.
3.
Log the measured values.
Measurement of the earthing resist-
ance
Assembly
Final checks > Electrical measurements and function tests
14.09.2022
TracFeed
®
SFA Electromechanical remote motor drive
53
