Track signal correction (GPOC) X7

NAVIGATION: encoder > X7_ (eg_SinCos_Channel1) > Track signal correction (GPOC) X7

Track signal correction (GPOC) X7

For channels 1 and 2 the GPOC (Gain Phase Offset Correction) method can be activated for the analog track signals. This enables the mean systematic gain, phase and offset errors on the analog track signals to be detected and corrected. GPOC weights the amplitude of the complex pointer described by the track signals by special correlation methods. The dominant errors can thereby be determined very precisely, with no interference from other encoder errors, and then corrected.

Variants for track signal correction

CORR: Track signal correction with stored values
ADAPT: Track signal correction with online value tracking

Parameters

P. no.	Parameter name Settings	Function
P 0549 P 0561 P 0586	ENC_CH1/2/3_Corr	Selection of correction method
(0)	OFF	No method selected
(1)	CORR	Activate correction with stored values
(2)	ADAPT	Track signal correction with automatic (online) value tracking
(3)	RESET	Reset values
P 0550 P 0562 P 0587	ENC_CH1/ 2/3_CorrVal	Signal correction / Values obtained
(0)	OffsetA	Offset, track A (sincos)
(1)	OffsetB	Offset, track B (sin)
(2)	GainA	Gain, track A (sincos)
(3)	GainB	Gain, track B (sin)
(4)	Phase	Phase

Tabelle: Parameters for track signal correction

Correcting track signals

Open the manual mode window and set speed-controlled mode.
Set the optimization speed
- Resolver: approx. 1000 to 3000 rpm
- SinCos encoder: approx. 1 to 5 rpm
Switch to "ADAPT" during operation and wait about 1-3 minutes for the compensation algorithms to reach their steady state. The speed ripple should decrease after about 1 minute (observed with scope; actual speed value or observation of values in
P 0550, P 0562, P 0587, ENC_CH1 / CH2 / CH3_CorrVal).
Switching from ADAPT to CORR saves the values. If new values are to be acquired, you must switch from CORR to ADAPT and save them again.

ATTENTION:

When replacing a motor, the GPOC for this system must always be repeated.