Elmo DBP SERIES manual Oscillator Frequency/Amplitude Selection R228,R233

87

Oscillator

Creates sinusoidal waveform signal to excite the primary of the Resolver.

Oscillator Frequency/Amplitude Selection (R228,R233)

The frequency (fr) and amplitude (Vr) needed to excite the Resolver are taken from the Resolver data sheet.

Selecting the frequency:

R228 = 110/fr (Kohm)

0.1KHz < fr (KHz) < 20KHz

Selecting the amplitude:

Pay attention that the RMS amplitude does not exceed 7Vrms or that the peak-

to-peak (ptp) value is within the range of 2V < Vrptp < 20V. For Vr in peak-to-peak value:

	R233 = 6/(Vr - 2)	(Kohm)
For Vr in RMS value:
	R233 = 6/(2.82Vr - 2)	(Kohm)

Reference Voltage level to R/D (R192)

In order to adjust the reference voltage input level to 2Vrms, select R192 as follows:

R192 = 50 x (Vrrms - 2) (Kohm)

For Vrrms <2V, install R192=100 ohm.

DBP - Rev 6/93