XPRT-6kVA, XPRT-10kVA USER’S MANUAL
UNINTERRUPTIBLE POWER SUPPLY (UPS)
Xtreme Power Conversion® (XPC) Corporation
Page 57
Bypass Out of Limits
The input utility voltage or input utility frequency is outside bypass tolerance but inside UPS input
tolerance. Bypass operation is inhibited: if for whatever reason the UPS is not able to deliver the required
output, output power is lost. If the input frequency is often out of tolerance – during which bypass
operation is inhibited and an alarm is generated – it may be useful to disable bypass function (via UPS
monitoring software) after which the unit operates as a UPS without automatic bypass switch.
NOTE
The unit can be used as frequency converter: the input frequency range is 47.5-
63Hz, the output frequency is selectable 50/60 Hz, via UPS monitoring
software. If the unit is used in this configuration, the bypass function is no
longer available.
Overload
The demanded power exceeds the nominal capacity of the UPS. The “overload warning” alarm occurs
when the load exceeds 150% the UPS will immediately switch to bypass, assuming that the conditions for
a transfer to bypass are fulfilled.
If an overload condition between 110-150% persists, the UPS will also switch to bypass operation. In both
conditions the “overload” alarm is generated.
During an overload the UPS may automatically switch off within a few minutes (load dependent) and
output power is lost:
•
if a transfer to bypass is inhibited, or
•
if the bypass function has been disabled, or
•
if the UPS operates on battery.
To avoid these problems, be absolutely certain that the power demand of the protected equipment is
within the limits of the UPS.
Replace Battery
Either the batteries are almost chemically worn out or the battery wiring, including the battery fuse, is
faulty. If the batteries are aged, they must be replaced as soon as possible to ensure full protection for
your equipment. Perhaps the 'replace battery' alarm occurs after a test which you started immediately
after installation or after a power failure. In this case the alarm may be incorrect as the batteries have
been (partially) discharged during transport or storage or during the power failure. For this reason we
advise to execute battery test only after 5 hours on line operation with no input utility failures. This
allows the UPS to recharge the batteries.
