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DFX-8500
Rev. B
2-2
8
Deceleration control:
Deceleration control provides smooth deceleration and prevents rapid vibration.
The duty data for deceleration control is determined for each printing mode. Pulse width modulation (PWM)
determines each printing mode.
Current speed - SP3
1. The printer uses Deceleration driving mode 2, based on the duty data, and the rest of the time, it uses
Deceleration driving mode 1.
2. During this time the control circuit measures time periods using the encoder signal, and controls the
following:
• When duty data becomes Duty
min1
before the carriage speed reaches SP3.
• When the carriage speed reaches SP3 before duty data becomes Duty
min1
, the next sequence (SP3 -
Speed 0) takes effect.
SP3 - Speed 0
1. When the carriage speed reaches SP3, Deceleration driving mode 3 takes effect. This control method is
the inverse-continuity break method.
2. During this time, the control circuit measures time periods using the encoder signal. When the rising
edge of next pulse is not detected after 1.5 seconds, Deceleration driving mode 1 takes effect and the
control circuit controls short-break.
0
SPref
SP3
Deceleration 2
or
Deceleration 1
Control Signal
PWM Perodic Time
1 2 3
Deceleration 3
Deceleration Curve
Note: 1, 2, and 3 indicate the PWM control section number.
Figure 2-22. CR Motor Drive Circuit Block Diagram