Short-Circuit Withstand Capability - Siemens SIMOVERT Master Drives 6SE70 Betriebsanleitung

Connection
3.1.1

Short-circuit withstand capability

In the event of a line-side short-circuit in front of the super-fast built-in fuses, the power fed in from the supply
depends on the protective devices provided on the system-side (NH fuses or circuit-breakers).
To ensure that the forces and temperatures that result from short-circuits of this type can be kept within
acceptable limits for the units, the following values calculated in accordance with DIN VDE 0660 Part 500 must
be complied with by the supply and by the fuses or circuit-breakers connected before the unit.
Size H:
Rated short-time withstand current: I
Rated surge withstand current:
The power rails must be mechanically buffered to absorb the short-circuit forces directly in front of their entry
point into the unit.
Size K:
Rated short-time withstand current: I
Rated surge withstand current:
The power rails must be mechanically buffered to absorb the short-circuit forces directly in front of their entry
point into the unit.
Unit Order No.
voltage
6SE70
38-2EH85-0AA0 380 to 480
41-0EH85-0AA0 380 to 480
41-3EK85-0AA0 380 to 480
41-8EK85-0AA0 380 to 480
37-7FH85-0AA0 500 to 600
41-0FH85-0AA0 500 to 600
41-3FK85-0AA0 500 to 600
41-5FK85-0AA0 500 to 600
41-8FK85-0AA0 500 to 600
37-7HH85-0AA0 660 to 690
41-0HH85-0AA0 660 to 690
41-3HK85-0AA0 660 to 690
41-5HK85-0AA0 660 to 690
41-8HK85-0AA0 660 to 690
Table 3.4 Recommended commutating reactor
3-6
ENGLISH
= 27.86 kA / 1s or I
cw
I = 85 kA
pk
= 69,86 kA / 1s or I
cw
I = 85 kA
pk
Rated input
current
(V) (A)
710 4EU3651-8UA00
888 4EU3651-0UB00
1156 4EU3651-1UB00
1542 4EU3951-2UB00
671 4EU3651-3UA00
888 4EU3651-4UA00
1119 4EU3951-2UA00
1306 4EU3951-3UA00
1633 4EU4351-2UA00
671 4EU3651-7UA00
888 4EU3951-0UA00
1119 4EU3951-5UA00
1306 4EU4351-0UA00
1633 4EU4551-0UA00
= 88.1 kA / 0,1s
cw
= 220 kA / 0,1s
cw
Commutating reactor 2%
Type Voltage / Frequency
(V / Hz)
400/50
400/50
400/50
400/50
500/50
500/50
500/50
500/50
500/50
690/50
690/50
690/50
690/50
690/50
current
(V / Hz)
460/60
460/60
460/60
460/60
Siemens AG 6SE7087-6AK85-0AA0
Common Rectifier Operating instructions
09.02
Rated
(A)
720
910
1120
1600
710
910
1120
1250
1600
710
910
1120
1400
1600