Torque Current Limiting - Baumuller b maXX BM3000 Operating Manual

4.7
Controllers
NOTE!
Up to firmware version V01.08: The dead time measurement must be repeated if the
PWM frequency is changed.
From Firmware version V01.09: If the correction table
firmware version V01.09 onwards and the adaption of the dead time compensation
according to the PWM frequency is active
of the dead time compensation is corrected according to the effective PWM frequen-
cy. A new dead time measurement after a change of the PWM frequency is therefore
not necessary. However the best results are generally reached if the used PWM fre-
quency corresponds to the PWM frequency at the moment of the dead time measure-
ment.

4.7.2.3 Torque Current Limiting

The torque current limiting acts on the integral term of the speed controller and on the out-
put of the motor manager before the current is forwarded to the current controller.
There is no limiting at the output of the speed controller because a digital filter can be in-
serted between the speed controller and the motor manager, or an Isq can additionally
be fed into the motor manager.
The torque current limiting can be set separately for motor or generator operation
(Z138.2–, Z138.3–). By adapting the "Mode of Iq limit "
iting can alternatively be applied to Torque Direction 1 or Torque Direction 2. For "asym-
metric" limiting, operating quadrants 1 to 4 are evaluated using the present speed and
torque current. Hysteresis
rants.
Two symmetrical limits
pendent on quadrants. The limiting
ogous input or fieldbus process data. Other limits of the torque current are the breakdown
limit (Z138.18–, also refer to
to Z138.8–).
A torque current limit is set by the torque limit
Furthermore, the torque current can be disabled due to a power failure (refer to
bit 1).
Always the less value of these limits is effective! The effective limit values are displayed
in
The settable torque current limits Z138.2–, Z138.3–,
standardized by the "Max. torque current"
rameter. The parameters of ProDrive can be entered and displayed in ampere (as this
was demanded by the setting auxiliary) but the values can change in the operating pro-
cess because the reference value could change due to field weakening or to external total
current limit. Refer to the parameter
Dependent of the standardization modes (parameter "Mode lq limit"
bit 3) the calculation of the parameter
ing standardization or limit modes accordant to the motor type are available: Load mode
Standard, Load mode ASM-lsdMax and the current mode.
470 Parameter manual b maXX BM3000
Document no.: 5.12001.07
of 820
Z138.14–
Z138.6–
Iq upper limit and
(Z123.1–
Z138.4–
can be set when determining the operating quad-
Z138.15–
and are available in addition to the limit de-
Z138.14–
is intended for a fast cyclic access via anal-
ZBreakdown torque–
Z138.22–
Z138.7–
Iq lower limit.
Z19.8–
Z19.8– and Z138.1–.
Z19.8–
can be changed. Consequently, the follow-
Z123.15–
is measured from
bit 3 = 1), the effective voltage
Z138.1–
bit 0, the separate lim-
on page 498) or external limits (refer
as well.
Z138.14– Z138.15–
and
and is the percentage set of this pa-
Z138.1–
Baumüller Nürnberg GmbH
Z130.10–
were
bit 1 and