23
LEDs Lit
Alarm Description
How to React to the Alarm
Overload. The UPS beeps about twice per second
and switches to Bypass (see Section 503). Your
equipment needs more power (watts) than the UPS
is rated to provide.
Shut off the least important equipment connected
to the UPS. If this solves the overload problem,
the UPS will switch from bypass back to normal
operation (using either AC line input power or
battery power).
Overload (in Battery Mode) or Battery Test. The
unit switches to Bypass (see Section 503). If this
is an overload, the UPS beeps about twice per
second; if it is a battery test, the UPS sounds a
constant tone.
If the problem is an overload, see the
recommendations above. If the UPS is doing a
battery test, no action is needed.
If the Battery LED is on, this means Replace
Battery. Battery voltage is below 140 VDC. The
UPS will sound a constant tone, and the battery
LED will flash. If there is a power outage, the
UPS will shut down.
If the Battery LED is off, this is a High Ambient
Temperature alarm. The UPS will sound a
constant tone.
If the cause of the alarm is the battery, phone the
nearest Best Power office.
If the cause of the alarm is the temperature, make
sure the unit’s fans and vent holes are not
blocked, and make sure the temperature at the
UPS location is not above 40° C (104° F). If none
of these conditions caused the problem, phone the
nearest Best Power office.
High output voltage / inverter short circuit. The
UPS will sound a constant tone.
Phone the nearest Best Power office.
High DC bus voltage. The UPS will sound a
constant tone.
Phone the nearest Best Power office.
Bypass static transfer switch short. The bypass
static transfer switch was shorted when the line
breaker was turned on. The UPS will sound a
constant tone.
Phone the nearest Best Power office.
Inverter static transfer switch short. The inverter
static transfer switch was shorted when the UPS
was started. The UPS will sound a constant tone.
Phone the nearest Best Power office.
