Xtreme Power Conversion Corporation
M90U-80 & 140 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 turned off.
• Make sure the breakers, Input 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. 3 jumper wires connect Input1 and Input2
(factory default).
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. A warning message will be indicated if the N is not connected.
There is no Breaker between Input2 and STS Module, the STS module is powered up when Input2 is powered,
though the Q1 Breaker is OFF.