Oki Microline 390, Maintenance Manual, Page: 34 / 174

3.1.6 Spacing drive circuit
(1) Spacing control
The motor control outputs the spacing motor phase signals
SP-V,
and in accordance with the spacing command from the microprocessor, and at the same
time outputs the overdrive signal (SPD-A).
The SPD-A signal is a fixed-period pulse signal. The pulse width is controllable by the program,
and is used to control the motor drive time.
The SP ON/OFF signal is used to control acceleration and deceleration motor torque.
The motor driver (MTDV) drives the spacing motor in accordance with these signals. Pins 9 and
11 of the MTDV are for the protection circuits against overvoltage and overcurrent,
respectively.
SP-u
SP-v
SP-w
SPD-A
64
l - l
SP-ON/OFF
Overdrive
current
wave form
3-7