Operation Manual ServoOne Supply Unit
32
ID no.: 1101.21B.6-00 Date: 04/2020
NOTe:
Further information and technical data on the use of common mode filters
can be found in the Mounting instruction Common Mode Filter CMR (ID no.:
1101.13B.x).
4.2.5
Use of common mode filters
If the axis controllers are supplied by the PSU, situations may occur which render the
mains input filter ineffective. The use of a common-mode filter in the DC link supply of
the axis controllers is an effective remedy here.
Recommendation:
The common mode choke should be used if
a.
There are more than 3-4 DC axis controllers in the network
or
b.
the motor cable lengths per axis controller are greater than 10 m or in total of
all axes be more than 30 m.
NOTe:
Typical servo cables have approx. 0.47 nF/m, corresponds to a permissible
total leakage capacitance of approx. 15 nF.
Note that values of 1 nF/m or more can easily be achieved with cables with
larger cross-sections (> 35 mm
2
).
See also condition “d”.
or
c.
In which users use special motors that have a higher parasitic capacitance to
earth.
Typical servomotors have approximately 10 nF.
or
d.
the total leakage capacitance is > 45 nF
Rule of thumb for total discharge capacity:
Electrical installation
Summary of Contents for ServoOne Series
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Page 90: ...Operation Manual ServoOne Supply Unit 90 ID no 1101 21B 6 00 Date Date 04 2020 Glossary ...
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