Liebert 300 series Installation, Operaton & Maintenance Manual page 47

Input Frequency
Sync Range:
0.5 Hz
Input Frequency Sync Range. This screen
displays the selected frequency tolerance. The
input frequency synchronization range is
adjustable (by internal control switches) and
may be set at &I, 3, or 5 Hz. The input power
must be within this range for the UPS output to
become synchronized with the input power. The
UPS is shipped with this setting at 0.5 Hz.
Slew Rate
0.1 Hz/Second
Press a8 to set
Slew Rate. This screen displays the selected
(by the selection pads) in 0.1 Hz increments
from 0.1 to 1.0 Hz per second (the recommended
value is 0.1 Hz). The slew rate determines the
tracking time the UPS inverter requires to
match a new input frequency. For example, if
the input frequency changes from 60 to 61 Hz,
the UPS inverta frequency will eventually
change to 61 Hz. The slew rate is the speed at
which the frequency changes fkom 60 to 61 Hz.
Low Battery
Warning Time
05 Minutes
Press 4.J toset
Low Battery Warning. This screen shows the
selected Low Battery Warning Time. This value
is factory set at 5 minutes. However, it is
adjustable (by the selection pads) in one minute
increments from 1 to 99 minutes. When the UPS
is operating on battery power, an Alarm
Message will appear when this setting is
reached. This warns the operator that battery
shutdown is imminent.
DC Bus Walk-in
I
DC Bus Wal&in. This screen displays the
current DC Bus Walk-in time. This setting is
selectable (by internal control switch) to provide
either a slow (20 seconds) or fast (5 seconds)
ramp up time on the DC Bus. The UPS is
shipped with this setting at 5 seconds.
Time and Date:
I
Time and Date. This screen enables the
operator to set ihe current time, day, and date.
To change the current time and date settings,
perform the following:
1. Press the Alarm Silence pad. The HH
indication begins to flash.
2. Press the Up or Down pad to change setting.
3. Press the Alarm Silence pad to cycle
through the remaining time and date
settings.
Battery Test. The Series 300 UPS will
automatically perform a scheduled on-line
battery test if this feature is enabled by the
the battery supplies power to the load for 30
seconds. The DC bus voltage is then compared
I
of the tests, the DC voltage setpoint, and
whether the test is enabled. The battery test can
also be manuslly initiated by Liebert Customer
Service and Support.
If the DC bus voltage remains above the
message is stored in the alarm history. The
charger is turn down and normal UPS operation
is resumed.
Five
Second
HH:MM:SS