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Siemens AG 6SE8004-0BH76
SIMOVERT MV Commissioning Instructions
107
5.3.2
Power-off sequence
A power-off sequence can be initiated in various ways
♦
Pressing the OFF button on the drive converter (if this is enabled in the FP IO):
Sequence corresponding to OFF1
♦
OFF1 from the remote control (terminal strip or PROFIBUS DP):
The drive is shut down
♦
OFF2 from the remote control (terminal strip or PROFIBUS DP):
Inverter inhibit, motor coasts down
♦
OFF3 from the remote control (terminal strip or PROFIBUS DP):
The drive is shut down with another ramp
♦
Fault trip
A fault trip can be initiated in various ways:
♦
when internal monitoring functions and protective devices respond.
♦
the safety circuit is interrupted, e.g. by opening the doors of the power
section or by pressing the mushroom head pushbutton in the door
♦
external fault signaled via the remote control
(terminal strip or PROFIBUS DP).
The faults can be assigned a fault class with the appropriate parameterization.
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Significant faults; the circuit-breaker is opened as quickly as
possible and the DC link discharged. The drive converter
goes into the FAULT condition
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Fault; the drive is shutdown as for OFF1. The drive
converter goes into the FAULT condition
The circuit-breaker is opened after the drive is shut down and the inverter inhibited.
When the circuit-breaker is opened, the white signal lamp goes dark and the green
signal lamp goes bright.
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The DC link can still be live (under voltage) even after the circuit-breaker is opened
and the green signal lamp is bright.
The DC link discharges itself.
For a fault trip, the DC link is discharged as quickly as possible via the integrated
discharge circuit (crowbar thyristor).
The sequences for the various power-off procedures are described in more detail
in the following sequence diagrams.
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For SIMOVERT MV drive converters with
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, the energy can only be
fed from the line supply to the drive. Regenerative feedback is not possible. The
drive can only draw as much power, as the drive converter takes as power loss.
The ramp-function generator down ramps must be set so that the drive converter
does not go into a fault condition with DC link overvoltage.
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