Hologic DISCOVERY A, Technical Manual

Page: 264 / 274

A-18
Motor direction has reversed during stepping [E_MOTION_REVERSED_I] Comment: Whenever a motor is moving, the driver checks its position every three
seconds. If the motor direction at each of these check intervals is not in the correct
direction, the driver stops motion and returns this error.
Motion reversal is primarily due to the stepper motor cutting out because of a thermal
overload and usually occurs on the AY motor. In most cases, a mechanical problem
(loose belt, loose encoder coupling, etc.) causes this problem. In some cases, a bad
encoder and in fewer cases, a bad drive board causes this problem.
Action: Wait a few minutes for the motor to cool down and re-try the scan.
Check the drive belt tension. Check the encoder coupling setscrew. If the problem is
not corrected, replace the drive board. If these steps fail, replace the encoder motor.
The procedure for these operations can be found in the Remove and Replace section of
this manual. If the problem persists, contact Hologic Technical Support.
Motor is at a limit [E_LIMIT_POSITION_I] Comment: An application tried to move the motor beyond the limit position (i.e., the
motor need not necessarily be at a limit).
Action: Be sure that the table and C-arm are at the correct starting position before
starting a scan. Verify that the range of motion (positive limit position) of the motors
(AR, AY, TX, TY and TZ) are correct for the QDR model. Also see the discussion
under E_COLLISION_IMMINENT_I.
Motor power has been turned off because the arm and table have collided! [E_COLLISION_STOP_I]
Action: To proceed, select emergency Motion on the Utility menu. Then push the table
away from the arm. To restart the system, select retry by pressing the <ENTER> key.
No A/C line interrupts! [E_WORKSTATION_BOOT_I] Action: Check that instrument power is on. When the problem is corrected, press
<Enter> to continue. If you want to leave instrument power off, press <ESC> to boot in
the workstation mode. In this mode, you can not do any scans even if you turn
instrument power back on. This massage can occur if the Emergency Stop switch is
pushed in.
Refer to the “NO A/C Line Interrupts” message at start-up on page 6-9.
No motion detected while motor stepping [E_NO_MOTION_I]
ERROR MESSAGE
HARDWARE
/SOFTWARE
ERROR
LOCUS COMMENT/ACTION