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Illustration 11: Transformer Cabinet in VACON® 1000 Line-up Systems
Input current Hall sensor
Output current Hall sensor
3.3.4 Junction Cabinet
The junction cabinet is used for field cable connections. See 6.5 Cable Entry and Termination.
3.3.5 Start-up Cabinet
The start-up cabinet (+PSTC) is an option for the VACON® 1000 line-up systems. The main function of the start-up cabinet is to de-
press inrush currents that can lead to a dip in the supply voltage:
A phase-shifting transformer with a large capacity can produce a magnetizing surge as high as 6–8 times the rated current of
the transformer itself.
The power cells of the drive contain several capacitors, which require a large precharge current when high voltage is applied.
HV~
MCB
M
Junction
cabinet
Startup
cabinet
Drive
KM51
Output filter
cabinet
e30bi650.10
Illustration 12: Start-up Cabinet Primary Side Diagram
Install the start-up cabinet between the high-voltage power input and phase-shifting transformer. When the MCB of the drive is
closed, the start-up cabinet limits the magnetizing surge and charge current of the capacitance quickly and efficiently. After the
drive is powered up, the current-limiting resistance passes through the KM51 bypass, and the drive can function normally.
The main electrical components of the start-up cabinet are a high-voltage switch (vacuum contactor or vacuum breaker) and a cur-
rent-limiting resistor.
AQ363633621020en-000201 / 172F3117 | 21Danfoss A/S © 2021.06
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VACON® 1000
Operating Guide
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