Owandy Radiology i-max touch, Service Manual

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SERVICE MANUAL
Description
I-Max Touch 3-7
3.3.1. Power supply assembly
It is located in the rear part of the column and is mainly composed by the
mains switch (S1), a 24Vdc 7A switching mode power supply which
supplies all circuits of the machine excluding the column motor, and a
further power supply which supplies the column motor and the enabling
circuit for X-ray emission.
The power supply assembly also acts as an interface with a number of
external signals and circuits like:

Input for remote X-ray push button (S7) and output to the CPU of the
same signal.

Outputs for the "Ready" and "X-ray ON" lamps (X3).

Driving of the DC column motor (M1): this motor can be activated
either through its control board (A1), in case the movement is
requested by the operator acting on the keyboard, or through the
switch S2 located in the rear part of the column base. This switch
can be used to raise/lower the column during the installation phase
when the CPU has not been yet connected to the system.

Input for the emergency column motor microswitches (S3 and S5):
these microswitches indicate the limit for the movement of the
column. If for any reason, the column goes beyond these
microswitches, the motor is de-activated by cutting the voltage.
Normally, the position of the column is also monitored by two other
microswitches (S4 and S6) that, as for all the other positioning
sensors, provide their signals to the Column CPU board (A1).
The unit does not include a voltage selector circuit for the mains voltage.
Therefore, the unit is manufactured in different versions, depending on
the line voltage of the installation place.
The power supply assembly module also includes the Column CPU board
(A1) that is dedicated to the control of the vertical column motion during
all phases (slow speed, ramp up to high speed, ramp down from high to
low speed, end run microswitches control, etc.).