Description of the Software Modules and Parameters
Parameter manual b maXX BM3000
Document no.: 5.12001.07
421
of 820
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4.6.3 Error reaction controlled stop
Another error reaction is the controlled stop. This is required if the motor must be stopped
quickly, but the error reactions "Stop at current limit", "RFG Quickstop ramp" and "RFG
Ramp-down" are not possible, e.g. because of an encoder error.
There are two versions of the controlled stop, braking in I/f operation and braking in U/f
operation, which can be selected in parameter
Z18.9– bit 6.
In I/f operation a constant current is preset by parameter Z133.22– and then the ramp of
the RFG is started at the last effective speed set value. Subsequently the frequency is
reduced linearly to frequency 0. If the speed set value is not available the last speed ac
-
tual value is used as start value.
At braking in U/f operation the current set values are controlled to 0 A at the frequency of
the last effective speed set value for a short time. The voltages adjust themself according
to the EMF of the motor. Subsequently the voltages are reduced linearly to standstill.
A soft torque reduction (see Z108.19–) is possible for both error reactions. At braking in
U/f operation the voltage at speed 0 is reduced only to zero voltage (Z166.5–). Subse-
quently the residual voltage is reduced linearly to the time for torque reduction.
NOTE!
If the error reaction controlled stop is selected for an encoder error, other errors must
set to this error reaction, which can occur subsequently to a faulty encoder evalua
-
tion. This includes the following errors 203 and 204 (overspeed), 201 (speed control
deviation) and 211 (field angle monitoring).
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