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Operating Modes
The UNITY/I display automatically shows the mode the unit is operating in. Table 2 below
shows sample displays and explains what they mean.
TABLE 2 - Operating Modes
Mode Displayed
(Sample Display)
What It Means
Normal operation
load power ##%
The UPS is in the normal operation mode. During normal operation,
mains (AC line) passes through the UPS and out to the load. The unit’s
inverter regulates the output and charges the batteries. The second line
of the display shows the % load on the phase (leg) that is most fully
loaded.
Battery operation
time ## minutes
The UNITY/I has switched to battery operation. This happens when
AC input (mains) is out of tolerance (when it is outside of the unit’s
programmed limits). The main static switch opens, and the inverter
draws power from the batteries. The power is then sent out to the
loads. If the batteries are depleted, the unit will switch to standby mode
(see below) and wait for mains to return in tolerance. Then, if autostart
is programmed to “On,” the unit will automatically start about 30
seconds after mains returns. If autostart is programmed to “Off,” you
must start the unit manually by pressing the green button inside the
front door. (See Section 205 to program the autostart parameter.)
Bypass operation
In this mode, the AC input (mains) passes unregulated through the
bypass static switch, through the main transformer, and out to the
loads. The UPS inverter is in the standby mode and is synchronized to
the mains, ready to transfer the unit to battery operation if mains
voltage goes out of tolerance (see the Glossary). For 50 Hz units, this
display may mean that the internal bypass switch is in the “Bypass”
position; see Section 304.
Economy mode
The unit has been programmed to operate in economy mode. The AC
power flow is the same as in bypass operation, except that the unit will
periodically transfer into normal operation to charge the batteries
(default is every 7 days). The inverter is in standby and is synchronized
to the mains, ready to transfer to battery operation if mains voltage
goes out of tolerance (see the Glossary). The output voltage is not
regulated in this mode, but efficiency increases. If you would like to
program your unit for economy mode, phone BEST’s Worldwide
Service or the nearest BEST office for more information.
** Stand-by **
Both static switches are open. The unit is not supplying output voltage.
You can switch the unit on by pressing the green button inside the
front door.
Summary of Contents for UNITY/I UT310
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