Description of the Software Modules and Parameters
Parameter manual b maXX BM3000
Document no.: 5.12001.07
143
of 820
4
The lower the factor the lower the Ud voltage limit is and the greater the distance to the
breakdown torque.
If the breakdown torque factor is one then the Ud voltage limit at the breakdown torque is
1/
2-times of the phase voltage which is available.
See ZTorque Current Limiting– on page 470.
138.18 Iq limit breakdown torque
The maximum torque current which is accepted due to the breakdown torque limit or the
breakdown torque controller. The breakdown torque limit calculates the maximum torque
current with the present electrical frequency and Ud voltage limit and the breakdown
torque controller limits the maximum torque current as soon as the required voltage ex
-
ceeds the maximum permitted voltage.
The breakdown torque limit l
sq k limit
138.18 can be activated by Z138.1– bit 2 and set by
the factor of the breakdown torque Z138.17–. Furthermore this limit can be set by an
adaption mechanism automatically to reach the aimed Ud voltage limit in spite of moder-
ate discrepancies in the motor model. In general the adaption is not activated for reasons
of compatibility. If the breakdown torque limit is active it is recommended to activate the
adaption as well (
Z138.1– bit 5 = 1).
The breakdown torque controller is activated by Z138.1– bit 4. If the breakdown torque
controller is activate the breakdown torque limit does not act anymore.
If the breakdown torque limit as well as the breakdown torque controller are deactivated
then
l
sq k limit
138.18 = l
sq Max
Z19.8–.
The parameter 138.18 additionally is limited to 2 x max. total current of the drive Z19.6–.
Other torque current limits can also be set Z138.2–, Z138.3–, Z138.14–, Z138.15– and
the torque current limit caused by the torque limit Z138.22–.
Furthermore, other torque current limits are available: Z138.30–, Z114.5– and
Z114.6–. Furthermore, the motor-operating torque current can be disabled due to a pow-
er failure (refer to Z138.10– bit 1).
The strongest limit is effective. The definite upper and lower torque current limit is dis-
played in Z138.6– and Z138.7–.
See ZTorque Current Limiting– on page 470 and see also Z138.16–.
138.20 Max. torque actual value
The parameter presents the maximum internal torque of the motor M
max act
. which is
available due to the maximum total current actual value and the field current. This value
is calculated from the maximum torque current. If the maximum current of the motor is
limited by a monitoring (such as PU overload monitoring, refer to "bit mask external total
current limit"
Z138.8–), then this is regarded in this parameter.
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