Manual Shut Down Sequence; Start-Up Sequence - Danfoss VLT AFE 302 Operating Instructions Manual

Crane System Design

3.8 Manual Shut Down Sequence

•
Stop all motor drives.
•
switch off the AFE start signal.
•
Delay one second.
•
Open the mains contactor
•
Switch off the HT transformer if necessary
•
In emergency, command the AFE to stop and open
the AFE contactor, or pull the safe stop and open
the AFE contactor.
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VLT Active Front End AFE 302 Operating Instructions Liebherr

3.9 Start-up Sequence

The following figure shows the system start-up sequence
flow chart. The flow chart describes the interaction among
Auxiliary Hardware, AFE Frequency Converters, and Liebherr
Control PLC. The arrowed lines indicate the flow of the
actions. The Liebherr PLC expects to receive the "Control
Ready" and "Ready" signals from the AFE frequency
converter and it will send "Run" signal to AFE frequency
converter. The waiting periods and the number of tries are
tentative. The "Control Ready" signal is on when the power
in Control Card (CC) is on. The meaning of the "Ready" signal
in the AFE frequency converter is different from the one in
the standard frequency converter. The "Ready" signal in the
AFE frequency converter is on when the DC voltage is
boosted to the level within the AFE regulation range.
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MG.33.X2.02 - VLT is a registered Danfoss trademark
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