09.2008 Functions
Siemens AG 6SE7087-6QX70 (Version AK)
SIMOVERT MASTERDRIVES Compendium Motion Control 7-71
7.3.9 Vdmax closed-loop control (function diagram 610)
The Vdmax closed-loop control function allows briefly occurring
regenerative loading to be handled without the unit shutting down with
fault message F006 "DC link overvoltage". In this case, the frequency is
controlled (closed-loop) so that the motor does not excessively enter
over-synchronous operation.
For a steady-state load, the converter output frequency must increase.
If regenerative loading occurs when the machine is decelerating too
quickly (P464), this is automatically reduced so that the converter is
operated at the voltage limit.
Function diagram 610 shows how the Vdmax closed-loop control
function operates.
The Vdmax closed-loop control is also optimally suited for regenerative
operation, which can occur when the speed stabilizes at the end of
ramp-up.
P515 Vdmax controller
Value range 0 and 1
0: The Vdmax controller is inhibited.
1: The Vdmax controller is released.
P516 Dynamic response of the Vdmax controller
Value range 0 % to 200 %
This parameter enables the response of the PID controller to be
influenced.
At 0 %, the Vdmax controller is shut down.
The factory setting is 25 %.
The controller output can be visualized via connector K0271.
The activation point for the Vdmax controller can be parameterized in
P517.
Description
Parameters for
setting the Vdmax
closed-loop control
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