Xtreme Power Conversion Corporation
M90 User’s Manual
Page 22
Uninterruptible Power Supply
2.11 Wiring
WARNING:
• Before connecting any wire, make sure the AC input and battery power is completely cut off.
• Make sure the breakers, Main Breaker (Q1), Maintenance Breaker (Q2), Output Breaker (Q3) and battery
breaker are all in the OFF position.
2.11.1 Installation Drawing
UPS
G
To User Safety ground
Inp
ut
1
R
S
T
N
To Main SUPPLY
(Power Cables)
Inp
ut
2
R
S
T
N
To Bypass SUPPLY
(Power Cables)
O
ut
put
R
S
T
N
To Critical Load
(Power Cables)
BA
T
+
N
-
To External BATTERY
(Power Cables)
Figure 2-23 UPS Cabinet Wiring
2.11.2 AC source connection
For Single input application, connect Input1 to the AC power source and use 3 short wires to connect Input1 and
Input2.
For Dual input application, connect input1 to the Main AC power source and connect input2 to the Bypass power
source.
The sequence of three phase, R, S and T must be connected accordingly. The wrong sequence will alarm a warning
when the UPS is powered.
The N must be connected firmly. A warning message will be indicated, if the N is not connected well.
There is no Breaker between Input2 and STS Module, the STS module is waked up when Input2 is powered, though
the Q1 Breaker is OFF.