Resolver compensation: New parameter 0x2C44:10 for simplified test condition for constant speed (from V02.15.02)

Function extension:
Resolver Compensation: The measuring method used in the i700 requires a constant rotary motion with as little external influence as possible. The specific properties of the resolver should be determined and not the properties of the entire drive system.

In phases with speed changes (acceleration / deceleration) the identification run is therefore interrupted and continued in phases with constant speed. To detect phases with constant speed, the specified speed reference value is evaluated and checked for 'acceleration close to zero' as an additional criterion. The tolerance window is set quite small.

If necessary, the acceleration criterion can now be deactivated with the newly implemented parameter. It is then sufficient if the speed is above 500 rpm for the identification to be processed. See also the remarks under Notes.

New setting parameter: 0x2C44:10 (0x3444:10) Resolver compensation: Acceleration criterion

0x2C44:10 = Off [0] : Condition for continuing des identification process:
(Speed set value > 500 rpm)
0x2C44:10 = On [1] (default) : Condition for continuing des identification process:
                                                             (Speed set value > 500 rpm) AND
                                                             (acceleration close to zero, ripple of speed set value inside a small tolerance window)

Contained in which products?
Servo inverter i700, V1: no implementation intended for V1

Servo inverter i700, V2: from V02.15.02.12693

Application:

Execution of resolver compensation under the following conditions:

Servo inverter i700 operated in csv mode (speed-controlled) and
position control is performed in the higher-level control system.

In this constellation, the speed setpoint is supplied with the control signals from the higher-level position control loop. The fluctuations that occur are recognized as successive acceleration and deceleration phases. Depending on the magnitude of the fluctuations, it may happen that the identification is run through without result because the condition 'acceleration close to zero' is not fulfilled over the entire execution time and thus no phase of constant speed is detected.

In such cases it is now possible to switch off the 'sharp' acceleration criterion with the new parameter.

Note:

With regard to the quality of the determined values of the resolver compensation, 'unfavorable' measurement conditions can exist if the speed reference value is supplied with strongly fluctuating control signals from a superimposed position control loop.

By switching over to the simplified criterion, the user deliberately accepts less favorable measuring conditions and thus possibly less good compensation of the resolver error or, in extreme cases, even an opposite effect.

Search terms: resolver identification, resolver error, resolver error compensation

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