Longitudinal Drive Motor Alignment to Field

Prerequisites

Table 2. Safety

warning

Personal injury and equipment damage
Strong Magnetic Field
When servicing any magnetic equipment, it is critically important that the service engineer consciously plan the path to be taken when moving highly ferrous devices in the magnet environment. the path should be as far from the magnet as practical and avoid high flux-density fields.
Safety Requirements
Movement of ferrous material in the magnet room must follow the GE service procedure for that device. When exiting, move away from the magnet in the most direct manner possible. Except when moving ferrous material to and from its native location on or near the magnet, the static magnetic field in any portion of the service path shall not exceed 200 Gauss.
Two (2) MR safety trained personnel must be present at all times when servicing highly ferrous devices in the areas of magnetic fields.
When planning a service path, it is critical that the path be clear and sufficiently wide. Ensure that there are no trip hazards, obstacles, clutter, slippery surfaces or other items even partially restricting the path. If there are portable obstacles in a path, remove them from the area and replace them after the service action is completed. It is required to walk the path prior to beginning service to ensure that there is sufficient space through which to pass for yourself and the object being serviced.

caution

FERROUS MATERIAL HAZARD!!
THE MOTOR IS MADE OF FERROUS MATERIAL. HOLDING THIS ASSEMBLY TOO CLOSE TO THE MAGNET BORE WILL CAUSE IT TO BE FORCIBLY ATTRACTED TO THE MAGNET.
TO PREVENT POSSIBLE BODILY INJURY OR DAMAGE TO MOTOR, MAGNET ENCLOSURE, OR MAGNET, DO NOT LIFT THIS MOTOR ABOVE THE LEVEL OF THE MOUNTING ON THE REAR PEDESTAL FRAME. TWO PERSONS ARE REQUIRED TO REPLACE THE MOTOR.

This procedure must be performed on either a replacement motor, or upon initial system installation to insure that the motor is properly aligned to the magnet field.

Procedure

Remove power to Long Drive Motor by switching off circuit breakers. Follow all Lock Out and Tag Out procedures by turning off the applicable breaker in the PDU (see Lockout / Tagout for System Cabinet PDU Main Breaker).
Remove left side cover of rear pedestal.

caution

PERSONAL INJURY OR EQUIPMENT DAMAGE
THE MOTOR IS MADE OF FERROUS MATERIAL. HOLDING THIS ASSEMBLY TOO CLOSE TO THE MAGNET BORE WILL CAUSE IT TO BE FORCIBLY ATTRACTED TO THE MAGNET.
TO PREVENT POSSIBLE BODILY INJURY OR DAMAGE TO MOTOR, MAGNET ENCLOSURE, OR MAGNET, DO NOT LIFT THIS MOTOR ABOVE THE LEVEL OF THE MOUNTING ON THE REAR PEDESTAL FRAME. TWO PERSONS ARE REQUIRED TO ALIGN THE MOTOR.

Remove four mounting bracket screws and loosen lower set screws. See Figure 1 .

Figure 1. Long Drive Motor Screws
When the Set Screws are loose, allow the motor to rotate to the magnetic field. See Figure 2
When the motor is aligned with minimal rotational force, re-tighten the set screws.

Figure 2. LONG DRIVE MOTOR ALIGNMENT
Then re-install the four mounting screws.

Finalization

Remove lock out an tag out devices and return power to the system.
Verify that pressing IN FAST button on Control Switch Board moves cradle into magnet bore, and that pressing OUT FAST button moves cradle out of magnet bore. If cradle movement is opposite of what it should be, reverse wires on terminals of longitudinal motor.