In case connector of XFA or XFD-PS is very tight

Prerequisites

Table 1. Personnel requirements
Required persons	Preliminary requirements	Procedure	Finalization
1	Not Applicable	60 minutes	Not Applicable

Table 2. Tools and test equipment
Item	Quantity	Effectivity	Part number	Manufacturer
Non Magnetic Tool Set	1	-	-	-
Digital volt meter (DVM)	1	-	-	-

Table 3. Replacement parts
Item	Quantity	Effectivity	Part number	Manufacturer
	-	-	-	-

Table 4. Safety

DANGER

STRONG MAGNETIC FIELD!

FERROUS MATERIALS CAN BECOME DANGEROUS PROJECTILES IN THE PRESENCE OF THE MAGNETIC FIELD PRODUCED BY THE SIGNA MAGNET.

Do not Bring any ferromagnetic tools or equipment into the magnet room.

DANGER

FATAL ELECTRIC SHOCK HAZARD!!

THE GRADIENT Amplifiers ACT AS CONSTANT LOAD SOURCES, AND WILL SEND maximum CURRENT TO ANY LOAD including any human who get across the outputs.

TO PREVENT FATAL ELECTRIC SHOCK, Follow loto steps as given in first section of this document to disable and verify safe voltage levels.

Table 5. Required conditions
Condition	Reference	Effectivity
PDU must be turned OFF. Refer to Lockout / Tagout for MDP(Main Disconnect Panel) or Facility PDU.	-	-

CAUTION

Wait 30 minutes to discharge the charge of Super Capacitor inside of XFD-PS.

Wait for 30 minutes.

Go to Magnet Room.
Remove Cover for XFD Power Pannel Assy.

Figure 2. Cover for XFD Power Pannel Assy.
Check the voltage at each axis terminals (X, Y, Z) and confirm that there is no voltage. Refer to Figure 3 for voltage check point.

Note:
Normally, the voltage of upper terminal will be 0 V after 30 minutes.

For lower terminal, the voltage may exist in case of switch failure in XFD-PS and the charge of super capacitor cannot be discharged.

If voltage exists in lower terminal, please check that SW1 of XFD-PS is turned to discharge position.

If SW1 is at discharge position, waited for 30 minutes, and voltage still exists at lower terminal, wait until the voltage becomes 0V.

While waiting, please install cover for XFD Power Pannel Assy.

At worst case, it will take 1 days to discharge.

Figure 3. Voltage Check
Remove the tight connector of XFD Power Pannel Assy.

Once XFA or XFD-PS is installed, connect the connector of XFD Power Pannel Assy and fix the screw tightly.
Install Cover for XFD Power Pannel Assy.
For normal operation, do not forget to turn the SW1 of XFD-PS to OPERATION mode.