can become important in the case of higher rotating field frequencies. When there is
an absolute reduction in signal strengths (amplitudes) as a result of the long cables,
P 566[0] - ENC_CH2_Amplitude can be used to subsequently increase these
amplitudes (up to a max. of +10.5%) so that a drive signal level of 80–85% for the
track signals is once again attained. This is achieved by adjusting the resolver
excitation amplitude. Parameter P 567[0] - ENC_CH2_EncObsAct can be used to
check the effects of adjusting the compensation settings. It returns the length of the
phasor for the track signals (sqrt(a²+b²)) and is accordingly a measure of “the
amplitude” of the track signals: If the phase shift is properly corrected at the end of
the compensation adjustment process, you can save the settings.
NOTE
l
This function is not available for the MSD Single-Axis Servo Drive
Compact.
l
Do not use cable lengths > 50 m without first consulting with Moog
.
6.6.2 Signal correction GPOC
(Gain Phase Offset Correction)
The resolver and Sin/Cos incremental encoder demonstrate systematic errors that
are reflected in the measured position and in the speed calculated from this (gain
and phase errors, offset components of the tracking signal). The GPOC method for
track signal correction compensates systematic errors. GPOC is available for
encoder channels 1 and 2.
MOOG
ID No.: CB40859-001 Date: 11/2020
MSD Servo Drive - Device Help
74
6 Encoder
Image 6.4: Track signals A and B with and without GPOC
