• SIGNA™ Hero 3.0T Service Methods
  • 5852800-8EN Revision 1.0
  • Object ID: 00000018WIA30159230GYZ
  • Topic ID: id_15667055 Version: 1.3
  • Date: Jul 5, 2019 5:47:15 PM

ICC Coolant Deionization

Prerequisites

Table 1. Personnel requirements
Required personsPreliminary requirementsProcedureFinalization
15 minutes90-180 minutes, depending on initial resistivity value10 minutes
Table 2. Tools and test equipment
ItemQuantityEffectivityPart numberManufacturer
Funnel1---
Water Removal Pump Kit 1---
DVMR Deionization Kit1-

5224090

-
Deionization Filter Cartridge Kit1-

5264701

-
5 gallon pail1-

2239133

-

About this task

This procedure describes the process to deionize and filter the coolant for ICC cabinet. The Deionization Kit will hook-up to the cooling loop to increase the electrical resistivity level and to filter the coolant. Chemical additives will also be added back into each cooling loop. A general schematic of the setup for a cooling loop is shown below. Deionization can be performed while other planned maintenance tasks are being done in parallel since scanning is still allowed when the tool is hooked up and running.

Figure 1. General Schematic
Topic ID: id_sbt_n4l_rhb

Deionization and Filtering the Gradient Coil Coolant

Procedure

  1. Open the ICC door.
  2. Open the Deionization Kit case and place on the floor in front of the cabinet. Position case so the pump is closest to the floor and horizontal to the floor.
  3. Uncoil the hoses by unfastening the Velcro straps.
  4. Using the wrench tool included with the kit, unscrew both the DI and Filter housings. Each housing may need to be pulled away from the case to fit the wrench behind.
  5. Open the package for the Deionization Cartridge, place it into the housing. Screw back into the top labeled Deionization. Be sure to tighten fully.
    Note: Check that the arrow on the DI cartridge is pointing UP.
  6. Open the package for the Filter cartridge, place it into the housing and screw back into the top labeled Filter. Be sure to tighten fully.
  7. Remove the plug from the GCU tank fill port. Connect the Funnel Extension to the fill port and thread the DI tank adapter into it.
  8. Connect the DI Kit coolant suction line quick disconnect to the drain port quick disconnect on the side of the GC reservoir.
  9. Connect the DI Kit coolant return hose quick disconnect to the DI tank adapter.
  10. Observe the suction line. Coolant should be trickling into the suction line. If coolant is observed in the suction line at the pump, the pump is sufficiently primed. If no coolant is observed in the suction line, verify that the return line is connected properly to the reservoir refill port.
    Note: DO NOT attempt to run the DI kit pump until the pump is primed.
    Figure 2. GCU Setup
  11. Connect power cords:
    1. Connect power cord to extension power cord.
    2. Connect extension cord to DI Kit power outlet located at the bottom of Control Unit and turn on the Power Circuit Breaker.
  12. Turn on the Service Outlet Breaker.
    Figure 3. Service Outlet Breaker
  13. Note: The deionization process for the Gradient Coil usually takes about 1 hour (but can take up to 3 hours, depending on the initial resistivity) and cannot be done while the system is in clinical scanning state. The process not only removes coolant contaminants but also coolant additives. Because of this, the procedure will run until the resistivity is > 600 kΩ-cm which could result in scan stop. Re-introducing the additives later will greatly decrease the coolant resistivity to the typical 7 kΩ cm to 12 kΩ cm level.

    Error trip level and deionized resistivity value transfer table show as below:

    Figure 4. Deionized Resistivity Transfer Table
    Check the resistivity of Gradient Coolant from Functional Diag (Diagnostics > System > Power/Support System > Cabinet Monitor Functional Diag). If resistivity is 600 kohm cm, turn off the Service Outlet Breaker.
    Figure 5. Functional Diag
    Note: If Gradient Coolant resistance is not within the specification but it does not change much, check that GCU is correctly working by checking the pressure meter.
    Note: If customer is scanning, exit the Common Service Desktop and perform [TPS reset] before turning over to the customer.
  14. Perform the following steps.
    1. Disconnect the QD of the DI kit return line from the tank adapter at the tank fill port. Then, set the hose into the Service Tank.
      Note: Coolant may spill out from the hose when disconnecting. Prepare Tank near the hose when disconnecting.
    2. Disconnect the quick disconnect (QD) of the DI kit suction line from the QD at the reservoir drain port. Then, set the hose into the Service Tank.
    Figure 6. Remaining Coolant in DI Kit
  15. Remove the tank adapter from the tank fill port connection.
  16. Place the funnel into the fill port of the GCU reservoir and restore coolant from the tank to the GCU reservoir.
  17. Fill the Gradient Coil Deionization Chemicals additive into GCU reservoir until the chemical reaches to the center of bottle label.
    Figure 7. DI Chemical
    Note: If you are scanning:

    If the chemical contents are filled into the reservoir too fast, the resistivity value may drop rapidly and reach a trip level, thus interrupting the customer scan. The resistivity should be in the 7kΩ-cm to 12kΩ-cm range after adding the GC additives.

    Note: Dispose of the Deionization Chemicals per local regulation.
  18. Top up the GCU tank with coolant if the coolant level is low. See GCU/CCU Coolant Refill.
  19. Remove the funnel and replace the hex plug for the GCU reservoir refill port.
    Note: If Deionization and Filtering of Power Electronics is also needed, you can skip the DI Kit Filter Replacement & Finalization tasks. You can go directly to next task Deionization and Filtering the Power Electronics Coolant.
Topic ID: id_ops_44l_rhb

Deionization and Filtering the Power Electronics Coolant

Procedure

  1. Note: The Power Electronics coolant should likewise be filtered using the deionization kit in order to keep the coolant clean and to refresh the coolant additives.
    Remove the plug from the CCU tank fill port. Connect the Funnel Extension to the fill port and thread the DI tank adapter into it.
  2. Connect the DI Kit coolant suction line quick disconnect to the drain port quick disconnect on the side of the CCU reservoir.
    Note: You can connect to the drain port displayed on the left or right (below), depending on the cabinet version.
  3. Connect the DI Kit coolant return hose quick disconnect to the DI tank adapter.
    Figure 8. PE Setup
  4. Turn On the Service Outlet Breaker.
  5. Run for 30 minutes. Then, turn off the Service Outlet Breaker.
  6. Perform the following steps.
    1. Disconnect the QD of the DI kit return line from the tank adapter at the tank fill port. Then, set the hose into the Tank.
      Note: Coolant may spill out from the hose when disconnecting. Prepare Tank near the hose when disconnecting.
    2. Disconnect the quick disconnect (QD) of the DI kit suction line from the QD at the reservoir drain port. Then, connect the hose to the hand pump
    3. Using hand pump. push out the coolant remaining in the DI Kit to the tank.
    Figure 9. Remaining Coolant in DI Kit
  7. Remove the tank adapter from the tank fill port connection.
  8. Fill the Power Electronics Deionization Chemicals additive into CCU reservoir until the chemical reaches the center of bottle label.
    Figure 10. DI Chemical
    Note: Dispose of the Deionization Chemicals per local regulation.
  9. Top up the CCU tank with coolant if the coolant level is low. See GCU/CCU Coolant Refill.
  10. Remove the funnel and replace the hex plug for the PE reservoir fill port.
  11. Follow the DI Kit Filter Replacement procedure to drain the DI Kit.
Topic ID: id_bxp_p4l_rhb

DI Kit Filter Replacement

Procedure

  1. Unplug the DI Kit power cord and extension cord.
  2. Using the wrench tool, do the following:
    1. Remove the DI housing and filter housing from the kit.
    2. Discard any residual fluid in the housings into the bucket.
      Note: This fluid is bio-friendly and can be discarded down a normal sewage drain. Although the water is treated for bateria and water corrosion, the levels of concentrate are safe for water and sewer systems disposal.
    3. Discard the DI filter cartridge and the filter cartridge.
    4. Re-install the empty DI housing and Filter housing so they are hand tight.
Topic ID: id_mvg_q4l_rhb

Finalization

Procedure

  1. Wipe down all wet surfaces.
  2. Close the ICC door.
  3. Coil the power extension cord and place on top of the DI & Filter support bracket.
  4. Coil the DI Kit hoses using the Velcro straps. Close the case and clasps.
    Figure 11. Packing the DI Kit