Figure CR Motor Drive Circuit Block Diagram

Deceleration 3

Stepping motor driver STK6713BMK4 (IC2) drives the PF motor. Figure 2-22 shows the PF motor drive circuit block diagram, and Table 2-9 provides the PF motor specifications.

Table 2-9. PF Motor Specifications

Specification

Description

Form

4-phase, 200-pole, HB* pulse motor

Supply Voltage

37 VDC (applied to the drive circuit)

Internal Coil Resistance

2.8 ohms + 10 % per phase at 25 oC

Frequency

4274 pps** (normal mode,, constant driving): 9.9 ips*** 2610 pps (middle speed mode,, constant driving): 6 ips

Current Consumption

Driving: 1.75 A, + 0.20 A per phase (average) Holding: 0.26 A, + 0. 2 A per phase (average)

The motor pulse switching signals are transmitted from CPU ports PG00 to PG03. The PF motor is controlled using open-loop phase switching based on the specified time data, and the phase driving method is 1-2 phase excitation. (When the PF motor is held, the phase driving method is 1 phase excitation.) The CPU selects the most suitable driving mode from the modes below according to conditions such as the paper feed length and the pull tractor condition.

□ Micro feed (adjust) mode : < 20 / 432 inches

□ Middle speed mode: > 20 / 432 inches and < 60 / 432 inches, or with optional pull tractor

Each phase switching FET in driver IC2 is an open collector. When the phase switching data is HIGH, the motor is turned on. The PFA port of the gate array monitors the phase A signal of the PF motor and checks whether it is operating normally. The PFA port is used as the WDT (watch dog timer). If PF motor operation is abnormal, the gate array outputs the /RSTOUT (reset request) signal to the system reset IC (IC13). Refer to Section 2.3.2 Reset Circuit.

Motor Epson 1050
Figure 2-23. PF Motor Drive Circuit Block Diagram

Figure 2-24 shows a block diagram of the RF motor drive circuit, and Table 2-10 provides the RF motor specifications. The RF motor is a stepping motor. The control circuit performs open-loop phase switching control according to the timing data for acceleration, constant speed, and deceleration. CPU ports PG10 to PG13 output the motor phase switching signals. The control method is not equipped with a hold circuit for changing the motor phase. The RF motor rotates when the carriage moves.

Table 2-10. RF Motor Specifications

Specification

Description

Form

4-phase, 48-pole, PM pulse motor

Supply Voltage

37 VDC (applied to the drive circuit)

Internal Coil Resistance

150 ohms + 10 % per phase at 25 oC

Frequency

720 pps

Current Consumption

Driving: 0.10 A (average)

Driving Method

Constant voltage driving, 2-2 phase drive

MAIN Board

E05B36

(IC1)

RFCOM

PG10

TMP95C061A

PG11

(IC2)

PG12

Q20.Q21

Q22 Q23

Q24 Q25

PNP Transistor x4

RFCOM

RFA

—►

RF B

RF Motor

RFC

—►

RF D

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