SDU AC-A Series
A272-290 Rev. 5 07/2018
Page: 4
!
WARNING
Risk of electric shock, disconnect AC main power source before wiring. Ensure proper grounding
4. I/O Wiring:
Make sure the UPS and the AC Supply is OFF (disconnected) before installation. Wire the
UPS terminals with 90 °C rated copper wire according to the table below. Connect the AC input ground
terminal to the main supply ground. Connect line in neutral supply conductors. Connect the loads to the
output hardwire connector. Verify proper wiring connections then apply power to the UPS.
Reference
Figure 2.
Wire Gauge
10-18 AWG
Screw Torque
9 lb-in. (101.7 N-cm)
5. Internal Battery:
Charge the UPS battery for a minimum of 8 hours before initial use. The UPS charges
its battery whether the UPS is on or off, when it is connected to AC power.
6. Warning Label:
Apply the provided electrical shock warning label to the panel, making it clearly visible
to the user.
Risk of electrical shock—
hazardous live parts inside this
panel may be energized from the
battery supply, even when the
input ac power is disconnected.
7. Do not
connect Ground to Neutral on either input or output terminals of the UPS unit.