Epson LX-86TM Especificações descarregar pdf (Página 55)

REV.-A

2.4.5 Carriage Motor

This section describes the sensor circuit, an outline of the firmware, and the drive circuit, which are

used to control the carriage motor. The specifications of the carriage motor are as follows:

Angle per step:

Number of steps per revolution:

Number of phases:

Excitation system and drive frequency:

Drive voltage:

Resistance per coil:

2.4.5.1 Home Position Sensor

7.5°

48 steps

Four

Unipolar drive, 2-2 phase excitation system (900

PPS)

Unipolar drive,

1-1

phase excitation system (450

PPS)

+24 VDC

41.5 ohms

A7Y0

The home position sensor detects the reference position of the carriage. The sensor is located at the

home position which is to the left of the first column. Figure 2-18 shows the home position sensor circuit.

—.—

—

R 20

CN7

5.6K

HOME

‘:

Home Position

Sensor

-d

Fig. 2-18. Home

R32

E05A03

(3B)

Position Sensor Circuit

When the carriage is at the home position, the reed switch is closed, and a LOW signal is input to the

HOME terminal of the

E05A03. The CPU reads MMIO port XX

H of the E05A03 to determine when

the carriage is at the home position.

2-23

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