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0170009-J0 Rev B
A-5 Inverter Failure
If there is a short circuit in the output circuit when the power is supplied from the inverter, the UPS shuts
down the inverter to shut off power to the loads. The fail LED illuminates and the buzzer beeps con-
tinuously. The UPS does not switch on automatically after the short circuit condition disappears. The UPS
must be re-started manually. Refer to Section 5.2.1, Start Up in Normal AC Mode.
A-6 Inverter/Internal Over temperature
The UPS switches to the bypass mode if the UPS experiences an internal over-temperature when the
utility voltage is normal. The UPS switches back to the inverter mode when the over-temperature disap-
pears. If an over temperature occurs when the utility voltage is outside the UPS design limits, the buzzer
beeps continuously and the Fault LED illuminates. The UPS shuts off the power to the loads.
A-7 Inverter Over
An Inverter Over condition means that the current and inverter output voltages are outside the design
limits.
If the UPS inverter delivers an over-current and out-of-tolerance voltage to its outlets, the UPS is out of
order. The UPS switches to the bypass mode if the utility voltage is normal. The Utility LED, Bypass
LED, and Fault LED illuminate.
If these two fault conditions occur when the utility voltage is outside the UPS design limits, the UPS shuts
off the power to the loads and the Fault LED illuminates.
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