Epson DFX-5000+, Service Manual

Page: 87 / 223

Operating Principles
2. When the carriage speed reaches the printer uses the acceleration driving
mode, based on the duty data, and the rest of the time, it uses Deceleration
driving mode 2. (Refer to Table 2-5.)
3. During this time the control circuit measures time periods using the encoder
signal, and controls the following:
When duty data becomes
before the carriage speed reaches SP2.
Then, when the carriage speed reaches SP2, the next sequence takes effect.
When the carriage speed reaches SP2 before duty data becomes the
next sequence takes effect.
When the carriage speed reaches SP2, PI control oversees the carriage speed
Deceleration control
Deceleration control provides smooth deceleration and prevents rapid vibration.
Figure 2-25. Deceleration Control Curve
Note : In Figure 2-25, the deceleration curve is labeled A and the driving modes are
labeled B.
and 3 indicate the PWM control section number.
EPSON Service Manual
2-35