JOG NOW : Service & maintenance manual - rev. 6.2
Page 3.20
3.22.8.
T
READ BELT MOTOR DRIVE
3.22.9.
M
ECHANICS
The tread belt is actuated by the motor through a linkage consisting of the motor pulley, the driving
roller and the belt which connects them. In this way, a given belt motor speed corresponds to a
predetermined linear tread belt speed.
3.22.10.
C
ONTROLS
The control block diagram is as follows:
To actuate the motor, the CPU board communicates with the driver via the RS-485 serial link.
Based on the commands received, the Driver
drives the motor by applying a variable frequency
sinusoidal voltage: the frequency determines the speed of rotation of the motor and hence the linear
tread belt speed.
During its movement, the driver continually checks the motor by monitoring its current draw as
well. If any problems are detected (low voltage, over-current, SW or HW inverter, etc....) it halts the
motor and sends an alarm signal to the CPU board, which displays a “THE EQUIPMENT IS
BLOCKED” which may lead to different error codes stored by the driver.
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