Danfoss iC7 Series Design Manual page 52

Design Guide | iC7 Series Air-cooled System Modules
Table 14: Selection of the Correct Pre-charging Unit
System modules
IM10 + IM10 / IR10 + IR10
IM11 + IM11 / IR11 + IR11
2 x IM10 + 2 x IM10 / 2 x R10 + 2 x IR10
2 x IM11 + 2 x IM11 / 2 x IR11 + 2 x IR11
3 x IM11 + 3 x IM11 / 3 x IR11 + 3 x IR11
4 x IM11 + 4 x IM11 / 4 x IR11 + 4 x IR11
5 x IM11 + 5 x IM11 / 5 x IR11 + 5 x IR11
6 x IM11 + 6 x IM11 / 6 x IR11 + 6 x IR11
Table 15: Maximum Capacitance of the Pre-charging Unit
Pre-charging unit
Pre-charging unit 10 (IEC or UL)
Pre-charging unit 20 (IEC or UL)
Pre-charging unit 30 (IEC or UL)
There are thermal restrictions in a repeated use of the pre-charging unit. See the allowed pre-charging cycle in a 60 °C (140 °F) ambient
temperature in Table 16.
Table 16: The Thermally Allowed Pre-charging Cycle
Step
1.
2.
3.
4.
5.
6.
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Pre-charging unit
Pre-charging unit 10 (IEC or UL)
Pre-charging unit 20 (IEC or UL)
Pre-charging unit 30 (IEC or UL)
Network [V AC]
400/500
690
400/500
690
400/500
690
Task
Charging
Discharging
Charging
Discharging
Wait for the pre-charging unit to cool
down.
Repeat
Capacitance [μF]
66500
29500
184000
76500
275000
114500
Duration
10 s
50 s
10 s
50 s
10 min
–
AJ389643111587en-000101 / 172F6361A