Section 6 - Fault Isolation
6-35
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 (hose clamps). 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.4
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
header, page 6-17 in this section.
To Next Page
Loading...
