R
SC
= 250 R
SC
= 200 R
SC
= 100 R
SC
= 50
Classification
S
k
S
A
S
A
S
A
S
A
3
Non-rigid mains
3 12 15 30 60
2 8 10 20 40
1 4 5 10 20
0,6 2,40 3 6 12
R
SC
Mains short-circuit ratio
S
k
Mains Short-Circuit Power
S
A
Connected load of all electric loads at connection point (apparent
power of fundamental wave)
Tab.7-3: Maximum Allowed Connected Load
Measures for Compliance with Al‐
lowed THD or Distortion Factor
For public mains we distinguish the following mains connections:
● Mains connections with I ≤ 16 A (EN 61000-3-2):
With an R
SC
≥ 1000, there normally isn't any restriction of the allowed
mains current distortion (according to EN 61000-3-2).
● Mains connections with I > 16 A;I < 75 A (EN 61000-3-12; I > 75 A not
defined by any standard at present):
The power supply company determines the restrictions. Unless there
are other values available, the following data can be considered as
guide values.
R
SC
Allowed THD of mains current
Allowed distortion factor of
mains current
≥ 1000 THD > 48% K > 45%
≥ 120 THD ≤ 48% K ≤ 45%
> 33 THD < 13% K < 12 %
Tab.7-4: Allowed THD / Distortion Factor with Given R
SC
of the Mains
(U < 600 V)
Measures to comply with the maximum allowed THD or distortion factor:
● Use of mains chokes
● Use of supply units with incorporated power factor correction PFC
The following fact applies to the mains choke: The higher the in‐
ductance of the mains choke, the lower the TDH / distortion factor
and the mains pollution.
The THD values specified in the table below can be obtained under the fol‐
lowing conditions:
● Supply unit operated with nominal power
● Operation with constant load
● Low degree of voltage distortion at the point of power supply connection
at which the supply unit has been connected (according to EN
61000-2-4, compatibility level in accordance with class 2)
DOK-INDRV*-SYSTEM*****-PR06-EN-P
Rexroth IndraDrive Drive Systems with HMV01/02 HMS01/02, HMD01, HCS02/03
Bosch Rexroth AG 83/309
Project Planning of Mains Connection
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