Epson DFX-5000+, Service Manual

Page: 91 / 223

Operating Principles
Table 2-6. PF Motor Specifications
Specification Description
Form
4-phase, 200-pole, HB* pulse motor
Supply voltage
35 VDC 6% (applied to the driver circuit)
Internal coil resistance
2.85 0.32 per phase at 25°C (77°F)
Frequency
4274 pps** (normal mode, constant driving): 9.9 ips***
2610 pps (middle speed mode, constant driving): 6 ips
Current consumption
Driving: 1.95 A, 0.20 A per phase (average)
Holding: 0.26 A, 0.02 A per phase (average)
* HB = Hybrid
** pps = pulses per second
*** ips = inches per second
RF Motor Driver Circuit
Figure 2-28 shows a block diagram RF motor driver circuit, and Table 2-7
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
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.
Figure 2-28. RF Motor Driver Circuit
EPSON Service Manual 2-39