• SIGNA MR355 / SIGNA MR360
  • Service Manual
  • 5856356-3EN Revision 5.0
  • Basic Service Documentation. Copyright General Electric Company.
  • Object ID: 00000018WIA30A77E20GYZ
  • Topic ID: id_13107079 Version: 3.0
  • Date: Aug 29, 2019 1:36:47 AM

Removing Active Shim Coils

Overview

The ShimConfig.cfg file is located in /usr/g/w/config and contains the following information for each coil:

  • harmonic naming order

  • current calculation; on or off

  • existing coil current value

  • pertubation current value

  • maximum power supply current

  • power supply or gradient coil name

  • harmonic name.

The vi editor is used to edit this file.

Coil Removal

  1. At the operator workspace, select the Tools icon in the desktop control panel.

  2. In the Service Browser, select the Calibration tab, then in the menu options on the left side of the browser, click LVShim. On the right side, click the link Click here to start this tool. Refer to Table 1.

Table 1. COIL REMOVAL
{unix prompt} ..................................cd /usr/g/w/configEnter
{unix prompt} ..................................Verify the file exists ls -al Shim*.*Enter ShimConfig.cfg is part of Load From Cold software.


                    If ShimConfig exists, the following is displayed:
-rw-rw-rw-   1 sdcbin  informix  7973 Sep20 18:25
ShimConfig.cfg

                  


                    vi ShimConfig.cfg to edit the file.
1. Move cursor to appropriate coil set.
2. Position on the line of the power supply to be turned off.
3. Move cursor to 2nd column of line and change the 1 to 0.
4. Exit vi saving changes.
The power supply with 0 in the 2nd column has been eliminated from the coil matrix.