Carriage Drive; Space Motor Control - Ithaca 75 User Manual

82
Series 70 Maintenance Manual

CARRIAGE DRIVE

Space Motor Control

Figure 52: Communication Sequence for Space Motor Control
The motor control LSI (Q4) outputs the space motor phase signals (SP-U,
SP-V, SP-W) 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 whose pulse width is
controllable by the program, and is used to control the motor drive time.
The SP ON/OFF signal is output during acceleration and deceleration when
greater torque is required.
The motor driver (MTDV) drive the space motor in accordance with these
signals. Pins 9 and 11 of the MTDV are for the over-voltage (9) and over-
current (11) protective circuits
.