Toshiba 431B Manuale Utente

 

4300 Series Ancillary Cabinets Installation and Operation Manual

The 431M Mechanical Interlock Plate is locked in the  On-Line position by a solenoid.  When the UPS is 

placed in Static Bypass mode, the light on the front of the MBS lights and the  interlock solenoid  retracts 

and allows the Mechanical Interlock Plate to be moved.  See Figure 12-8.

1.  Place the UPS in static bypass.  The Bypass indicator light on the 431M should illuminate and the 

interlock solenoid will retract. 

NOTE:  If the Bypass indicator light DOES NOT ILLUMINATE in bypass mode, contact Toshiba Field 

Service immediately.
2.  Slide the Mechanical Interlock Plate to the center position as shown in Figure 12-8 B.

3.  Switch  CB2 ON (up) as shown in Figure 12-8 C.

4.  Switch CB3 OFF (down) and CB1 OFF (down), as shown in Figure 12-8 D.

5.  Slide the mechanical Interlock Plate to the left position as shown in Figure 12-8 E.

6.  The circuit breakers are now locked in Maintenance Bypass position.  

1.  The Maintenance Bypass position is shown in Figure 12-8 E.  The UPS should be in static bypass 

mode, and the MBS indicator light should be illuminated.

2.  Slide the mechanical Interlock Plate right to the Center position as shown in Figure 12-8 D.

3.  Switch in order, CB1 ON (up), and CB3 ON (up) as shown in Figure 12-8 C.

4.  Switch CB2 OFF (down), as shown in Figure 12-8 B.

5.  Slide the mechanical Interlock Plate to the right position as shown in Figure 12-8 A.

6.  Place the UPS in  On-Line mode.

7.  The MBS indicator light should extinguish, and the MBS solenoid locks the Mechanical Interlock Plate 

in place.    

CB3

Maintenance Bypass to  On-Line

CB1

CB2

(C)

(E)

(A)

(B)

 On-Line  to Maintenance Bypass

CB3

(D)