• ident max torque deviation [5] = 3 % dr09
• ident max speed deviation [6] = 3 % dr04
• ident torque number of samples [7] = 1000
• ident speed stability check duration [8] = 30 ms
• ident speed max settle duration [9] = 500 ms
6.2.9.2 Execution of the torque offset identification
The identification is related to a specific switching frequency and a defined control
mode. Therefore, the required settings in the associated parameters is10 switching
frequency and cs00 control mode must be carried out before the measurement
routine is executed.
Außerdem muss der Antrieb so parametriert sein, dass er nicht schwingt und den
Drehzahlsollwerten auch folgen kann.
Activation of the measurement routine is only possible with modulation switched
off. The measurement routine is executed in the operating state st12 state machine
display = 5: start operation active.
By starting the measurement routine the parameters of moxx torque torque offset
data fswx are described. starting speed [2] and speed step [3] are automatically
calculated from the settings of mo38. The value of data status [1] is "0: not availa-
ble“. The control mode for which the measurement is performed is stored in control
mode [4].
The switching frequencies for which identification can be performed are defined by
the parameterization of is22 Basic Tp. If value 0: 62.5µs is selected for "basic Tp“,
mo39 torque offset data fsw0 and mo43 torque offset array fsw0 contain the values
for 2 kHz, mo40 torque offset data fsw1 and mo44 torque offset array fsw1 contain
the values for 4 kHz, mo41 torque offset data fsw2 and mo45 torque offset array
fsw2 contain the values for 8 kHz and mo42 torque offset data fsw3 and mo46
torque offset array fsw3 contain the values for 16 kHz.
If "basic Tp" is value 1: 71.4us is fsw0 = 1.75 kHz, fsw1 = 3.5 kHz, fsw2 = 7 kHz
and fsw3 = 14 kHz.
Thus, fsw0 is always the lowest switching frequency defined by is22, fsw3 is the
highest one.
For the identification, the speed mo38 [1] start speed (= moxx torque torque offset
data fswx => starting speed [2]) is approached first. Offset measurement occurs
when the speed is stable.