Epson SEIJ98006 manual PF Motor Excitation Mode and Usage, Excitation phase Usage Minimum step

EPSON Stylus Color 900 Revision C

Unlike the previous EPSON ink jet printers, the number pf the phase excitation input ports in the motor drive IC of this printer has increased to 8. The previous micro step system used total of 4 phase excitation input signals for both Phase A and Phase B. (Stylus COLOR, Stylus PRO series, and Stylus PRO XL series are exceptional, since they transfer 4-bit serial data from ASIC to the motor driver.) This is because the micro stepping was controlled by the software only. On the other hand, LB1847 enables 4W1-2 phase excitation using the hardware and is equipped with the necessary number of input ports (8 ports) for current setting signals. Among 8 input ports, 4 are allocated to each phase, A and B. Therefore, 16 types of current setting data can be constantly sent to the driver IC. The LB1847 controls the micro stepping system by exciting the corresponding phase based on the combinations of the setting signals sent from the ASIC.

Table 2-17 shows the excitation modes used for the PF motor and their usage.

Table 2-17. PF Motor Excitation Mode and Usage

Excitation phase	Usage	Minimum step
2-2 phase drive	Not used	1/720"(0.035 mm)
	Fast feed 1
1-2 phase drive	Fast feed 2	1/1440"(0.018 mm)
	Special fast feed
W1-2 phase drive	Not used	1/2880"(0.009 mm)
2W1-2 phase drive	Middle-speed feed	1/5760"(0.004 mm)
	Normal feed
4W1-2 phase drive	Micro adjust feed	1/11520"(0.004 mm)
	Slow feed

Operating Principles Electrical Circuit Operation Principles 70