Siemens MICROMASTER 440 Operating Instructions Manual page 216
0.12kw-250kw
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- Parameter manual (329 pages) ,
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3 Functions
V
DC_max
r0056 Bit 14
Fig. 3-83
On the other hand, if the Vdc_max controller increases the output frequency (e.g.
for a steady-state regenerative load), then the Vdc_max controller is disabled by an
internal drive inverter monitoring function and warning A0910 is output. If the
regenerative load continues, the drive inverter is protected using fault F0002.
In addition to controlling the DC link (closed-loop), the Vdc_max controller supports
the stabilizing processes of the speed at the end of an acceleration phase. This is
especially the case if there is an overshoot and the motor therefore briefly goes into
regenerative operation (damping effect).
The automatic increase of the braking ramp (refer to Fig. 3-83) can be
contradictory to the objective of the application. This behavior is not required,
especially for positioning drives and hoisting gear (e.g. cranes). A DC link
overvoltage condition can still be avoided by disabling the Vdc-max controller
(P1240 = 0) and by activating the following functions:
Extending the braking ramp (P1121)
Activating the compound brake (P1236) or dynamic brake (P1230)
216
V
DC
r1242
-controller active
1
0
⏐f⏐
Vdc_max controller
A0911
f
act
f
set
MICROMASTER 440
6SE6400-5AW00-0BP0
Issue 10/06
t
t
t
Operating Instructions
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