User guide

P/N: 021-00154, Rev. A.6 - updated for V4.7 Tools Page | 159
COIL
CURRENT
DITHER
0 A
FULL
TIME
HIGH FREQUENCY PWM WITH DITHER GEN
GEN
FIG. 8
The dither current waveform can be regulated to maintain the desired amplitude regardless of the inductance of
the coil. The dither amplitude decreases toward zero as the duty cycle nears 0 or 100%, but is constant over
the rest of the current range. The valve will not be used at zero or full current in many systems and the dither
amplitude will be constant over the usable range of coil current. The dither generator allows the dither
amplitude and frequency to be adjusted independently for maximum positive effect with minimum system
problems.