2. INSTALLATION
24
2.5
Connecting the UPS (Continued)
2.5.2
Connecting a UPS Equipped with Terminal Blocks
NOTE: An easily accessible and appropriate disconnect device must be
provided as part of the installation. Mark all circuit breakers supplying
power to the UPS in case it must be shut down in an emergency.
WARNING: Installation and wiring of a UPS equipped with terminal blocks must
be done by qualified technicians only. The wiring must conform to
applicable electrical codes. Make sure that the main utility panel is
shut off before proceeding.
1.
Connect the input wires to the input terminal block. Use 14 AWG
(2.0 mm
2
) wiring and torque the screws to 35 in–lb (4.0 N–m).
2.
Start and test the UPS without a load connected as described in Section
3.2.
3.
Shut off the UPS and connect the output wires to the loads. Use 14 AWG
(2.0 mm
2
) wiring and torque the screws to 35 in–lb (4.0 N–m).
Figure 2.12
Terminal Block
Connection Box
Input Terminal Block
Output Terminal Block
3. OPERATION
37
3.5
Front Panel Indicators and Controls (Continued)
8
Standby Mode
Sequentially flashing LEDs indicate the UPS is in Standby mode. The UPS
is ready to switch to On Line or On Battery mode, but there is no output.
Listed below are conditions that will make the UPS go into the Standby
mode and how the UPS responds to line conditions.
A.
The UPS is switched on with no utility line AC power present.
The unit switches into On Line
mode when utility line AC power is
present.
B.
The UPS is in On Battery
mode and shuts down because of low
battery charge.
C.
The UPS is in On Battery
mode and is shut down by an RS–232
Inverter Off
command.
D.
The UPS is in either On Line
or On Battery Mode and is shut down by
an RS–232 Output Shutdown command.
The UPS stays latched in this mode until an RS–232 Output Shutdown
Inactive command is received. If utility line AC power is present at the
input, the UPS switchs into
On Line Mode after the Output Shutdown
Inactive command is received. If there is no utility line AC power
present, the UPS stays in Standby mode, switching into On Line Mode
when utility line AC power is available.
