• SIGNA™ Hero 3.0T Service Methods
  • 5852800-8EN Revision 1.0
  • Object ID: 00000018WIA3002FE20GYZ
  • Topic ID: id_13106083 Version: 4.2
  • Date: Jul 21, 2021 10:57:16 AM

Power on sequencing 1

Prerequisites

Personnel requirements
Required personsPreliminary requirementsProcedureFinalization
1-30 minutes-
Tools and test equipment
ItemQuantityPart numberManufacturer
Digital Voltmeter (DVM)1--
Required conditions
MDP or Facility PDU is properly configured for voltage selection. Refer to Vendor manual.
E-Off Jumper of MDP was removed. Refer to vendor manual.
Table 1. Safety

About this task

The following provides an overview of each main component in this sequence:

List of Procedures

This document includes the following Power On Checklist procedures:

  • Perform LOTO on MDP or Facility PDU.
  • Confirm Internal Power Wiring to the Power Distribution Unit (PDU)
  • Confirm Overload and Short Circuit Trip Settings for the PDU Input Circuit Breaker
  • Check the gradient cable connection at the ISC Gradient Filter at Penetration Panel side.
  • System Main Breaker ON. ( All circuit breakers OFF position)
  • System Cooling Sub breaker ON (ICC GCU/CCU Breaker OFF)
  • Host Sub breaker ON
  • ICE/ICN Sub breaker ON
Topic ID: id_SL1816277-1178706

Confirm internal power wiring to the Power Distribution Unit (PDU)

Procedure

  1. Remove the ISC PDU bottom cover.
  2. Confirm that the three Input Voltage Selection Terminal Blocks are wired in the correct configuration. If the power connections are not configured properly, ensure that the proper personnel correct the wiring.
    Figure 1. Input voltage selection
    Figure 2. How to remove/install terminal cable
  3. Pull all the cables at the terminal and confirm that the cables are firmly connected to the terminal.
    Figure 3. Cable connection check
  4. Restore the ISC PDU bottom cover.
Topic ID: id_SL1816282-1178706

Confirm overload and short circuit trip settings for the PDU input circuit breaker

About this task

The overload and short circuit trip settings for the input circuit breaker must be set to the correct values corresponding to the input voltage.

Procedure

  1. Remove the small cover plate under the main circuit breaker.
  2. Lift open the transparent plastic cover on the lower portion of the circuit breaker to access the DIP switches controlling the circuit breaker.
  3. Make sure the switches are configured correctly. The illustration below shows the position of the DIP switches for each input voltage.
    Figure 4. Circuit breaker DIP switch settings
  4. If the DIP switches are not configured correctly, correct the DIP switches settings.
  5. Restore the small cover plate.
Topic ID: id_SL4802573-1178706

Check gradient cable connection at gradient filter

Procedure

  1. Check the gradient cable connections at gradient filter at penetration panel of ISC to make sure there are no shorts between two axis or load shorts to ground.
    Note: Complete this section BEFORE applying power to the system.
  2. Make sure the following checks between points are low resistance (< 5 ohms) with a DVM in the following table.
    Table 2. Gradient coil load check — ensure same coil
    From To Expected value
    X-Axis +X-Axis –< 5 ohms
    Y-Axis +Y-Axis –< 5 ohms
    Z-Axis +Z-Axis –< 5 ohms
  3. Make sure the following checks between points are open (> 10 k ohms) with a DVM in the following table.
    Table 3. Gradient coil load check — no shorts
    From To Expected Value
    X-Axis +Y-Axis +> 10 k ohms
    X-Axis +Z-Axis +> 10 k ohms
    Y-Axis +Z-Axis +> 10 k ohms
    X-Axis +Ground> 10 k ohms
    Y-Axis +Ground> 10 k ohms
    Z-Axis +Ground> 10 k ohms
  4. If any of the Table 1 and Table 2 checks fail, review the installation instructions for gradient cable connections between the magnet and the ISC prior to applying power to the system.
    Note: This check does not ensure X, Y and Z gradient load coils are connected to the corresponding gradient amplifier.
Topic ID: id_SL12731103-1178706

System power on

Procedure

  1. Make sure all circuit breakers on the front of the ISC cabinet PDU are in the off position.
  2. Set the GOC PDU breaker to on position.
    Figure 5. GOC PDU breaker
  3. Notify field service and other installation personnel who are working at the installation site that the LOTO will be removed so the MDP or Facility PDU power can be turned on.
  4. Restore power of ISC PDU at MDP or facility PDU.
  5. Switch on the ISC PDU main breaker.
  6. Switch the sub breakers to on according to the following order.
    1. Cabinet sub breaker on
    2. Push EMO Reset button
    3. System cooling sub breaker on
    4. HOST sub breaker on
    5. ICE/ICN sub breaker on
    Note: Host and ICE/ICN sub breaker must be on when turning on the GCU power in ICC.
  7. Proceed to ICC Hose Inspection, Coolant Fill, and Coolant Leak Check.