Type 2 Pre-charge circuit design
Type 2 pre-charge uses contactor M2 in addition to M1. An additional pre-charge secondary
winding is employed to be able to reach full rated voltage of the transformer primary and cell
connected secondaries.
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Figure 8-17
Type 2 Pre-charge Component Connections
Sequence of Operation
1. To start pre-charge,
DriveReadyToPrecharge_I
must be
true.
PrechargeStartEnable_O
is set true to start the sequence.
2. M2 is closed to begin resonance by connecting a capacitor in series with the
secondary.
PrechargeM2Close_I
is set equal to true.
3. When the input primary voltage reaches the max phase voltage set by the parameter
"Precharge voltage level" (2634), M2 contactor is commanded to
open.
PrechargeM2Close_I
is set equal to false.
4. The M2 acknowledge comes back,
PrechargeM2CloseAck_O
is set equal to true
.
M1
contactor is commanded to close,
PrechargeM1Close_I
is set equal to true.
Advanced Operating Functions
8.18 Pre-charge using SOP
Control Manual
Operating Manual, A5E50491925A
293
Содержание SINAMICS PERFECT HARMONY GH180
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