9600 Service Manual - gmecorp-usa.com

34 Mechanical Assemblies
VERTICAL COLUMN ASSEMBLY
OVERVIEW
Raising and lowering of the C-Arm is accomplished by an AC motor that drives
two sets of chains, a set (1 horizontal, 1 vertical) on both sides of the vertical
column (see Figure 15). The 18 inch travel of the column is restricted at both
ends by an upper and lower limit switch. A scale on either side of the column is
provided to give an indication of the C-Arm height. Switches on top of the control
panel assembly are provided for the operation of the motor.
INITIALIZATION
During the Mobile C-Arm boot sequence the +24 V Interlock circuit completes,
energizing relay K3 on the Power/Motor Relay PCB. When K3 energizes 115
VAC is routed to relays K12 and K13 on the Power Motor Relay PCB. The
+24VDC from PS2 is also routed to relays K12 and K13 for their control by the
control panel switches located on top of the cross arm housing.
VERTICAL COLUMN UP
When the Vertical Column lift switch is pressed the +24VDC completes a circuit
to the DC return line (pin 1) and energizes relay K12. When K12 is energized
115 VAC is switched (pin 5 to pin 6) to the vertical lift motor via the LIFT_115
VAC_B line. At the same time, +24 VDC is removed from pin 8 of K13, the
vertical column down relay to prevent damage to the motor in case both switches
were accidentally pressed at the same time.
VERTICAL COLUMN DOWN
When the Vertical Column down switch is pressed the +24VDC completes a
circuit to the DC return line (pin 1) and energizes relay K13. When K13 is
energized 115 VAC is switched (pin 5 to pin 6) to the vertical lift motor via the
LIFT_115 VAC_A line. At the same time, +24 VDC is removed from pin 8 of K12
the Vertical Column lift relay to prevent damage to the motor in case both
switches were accidentally pressed at the same time.
LIMIT SWITCHES
Two limit switches (LS1 and LS2) are used; one engages near full extension of
the Vertical Column and one engages near full retraction. When opened the limit
switches remove electrical power from the lift motor and stop the vertical column
motion.