Liebert 300 series Installation, Operaton & Maintenance Manual page 56

Alarm Message
Bypass frequency out of
Load transferred to bypass due
Excessive retransfers attempted
Static Switch failure
UPS output not synchronized to
input power
Input power single phased
BYPASS
Input power frequency is outside of the specified tolerance
(adjustable range .5 to 5 Hz). Automatic transfers to the Static
Bypass Line are prohibited. Do not operate the Rotary Switch
Critical load connected to the UPS has exceeded the UPS power
rating. The load has been automatically transferred to the Static
Bypass Line. Power to the load is not being conditioned by the
UPS. An automatic retransfer will be attempted when the load
is reduced. Determine cause
DC bus voltage has exceeded the specified limit. The load has
been autmnaticslly transferred to the Static Bypass Line. An
automatic retransfer will be attempted when the DC bus voltage
ret- to within tolerance. Contact Ziebert Customer Service
and Support this condition persists
if
Several automatic retransfer attempts (15 attempts during 20
minutes or less) have been made to retransfer the load from the
Static Bypass Line back to the UPS. The UPS has not been able
to consistently sustain the load because of an overload condition
or an imwter failure. The load will remain on the Static Bypass
Line. Power to the load is not being conditioned by the UPS.
Check other messages
for
overload and reduce the load.
A fault has been detected in the Static Transfer Switch.
Automatic transfers to the Static Bypass Line are prohibited.
Contact Ziebert Customer Service and Suuport.
UPS SYSTEM
UPS inverter output is not synchronized with the input power.
Automatic transfers to the Static Bypass Line are prohibited.
This is usually a temporary condition that is corrected
automatically by the UPS internal control system.
Meaning and
Corrective Action
the overload and reduce the Eoad.
of
than 2 minutes.
for more
Determine cause
failure.
the
of