Digital Equipment HA3000, Installation Manual

Page: 67 / 96

INSTALLATION 4–27
The seven power cables connecting the UPS CSA Cabinet to the UPS cabinet are provided
(Figure 4–17).
Four cables are connected to the isolation/step-down transformer terminals X1, X2, X3,
and X0. The other end of these cables are marked A, B, C, and N. These three phase
cables must be connected to the main ac input (MAINS1) terminals in the UPS cabinet,
and the neutral cable must be connected to the neutral busbar in the UPS cabinet.
Three cables are connected to the load side of the mechanical contactor (K2) in the UPS
CSA Cabinet. The other end of these cables are marked A, B, and C. These three phase
cables must be connected to the bypass ac input (MAINS2) terminals in the UPS cabinet.
A ground cable is supplied with the UPS CSA Cabinet. This ground cable must be
connected between the ground busbar in the UPS CSA Cabinet and the ground busbar in
the UPS cabinet.
K 4
K2
SW1
A
B
C
X1
X2
X3
H3
H2
H1
HA33D UPS CSA CABINET
CB1
G
X0
F4
F5
F6
A
B
C
G
A
B
C
NEUTRAL to UPS
TO UPS
BYPASS AC
INPUT (MAINS2)
MAIN AC
INPUT (MAINS1)
600 Vac
BUILDING
SOURCE
TO UPS
TO UPS
MKV-A2241-91
Figure 4–17 HA33D UPS CSA Cabinet Wiring Diagram
4.5.1.2 Connecting the HA33F with CSA Assembly Only
The connections to be made are the three-phase, four-wire Wye plus equipment ground.
The phase rotation must be A, B, C. Size the main input cables and upstream protection
devices according to the UPS cabinet input ratings.
Field wiring connections are made to TB4 which is located on the left-side wall of the
UPS CSA Cabinet (Figure 4–18). To gain access to this area, the door of the UPS
CSA Cabinet must be unlocked and opened, and the upper inside cover panel must
be removed.