Eaton DS7 - Page 59

2 Engineering
2.12 Loading conditions
DS7 Soft starter 09/16 MN03901001Z-EN www.eaton.com 55
Figure 36: Overload current X = 3 with DS7-34xSX055… soft starter
If a higher overload current (e.g. X ~ 5) is required, the start conditions stated
here require a DS7-34xSX100… (100 A) soft starter. The I
LRP
value here is
300 A for 5 s at 10 starts per hour. The required X
~ 5 (5 x 55 A = 275 A) is
thus fulfilled (X
~ 5.4).
Figure 37: Overload current X = 5 with DS7-34xSX100… soft starter
At X = 5 (I
LRP
= 275 A) the larger DS7-34xSX100… soft starter also allows
• 10 Starts per hour S with max. 10 s (T
x
),
• 20 Starts per hour with max. 7 s (T
x
).
SX55 1/h
DS7-34xSX055...
SX55 10/h
SX55 20/h
s
5 s
10 s
15 s
20 s
25 s
30 s
80 A 100 A 120 A 140 A 180 A160 A
I
LRP
= 165 A
200 A
30
1
20
10
t-Start (s)
SX100 1/h
SX100 10/h
SX100 20/h
s
5 s
10 s
15 s
20 s
25 s
30 s
175 A150 A 200 A 300 A250 A225 A 325 A 350 A
I
LRP
= 275 A
30
1
20
10
DS7-34xSX100...