SMARTZONE UPS USER MANUAL
7
If the input power is lost or has anomalies outside of the set ranges while the UPS is
operating in Normal mode:
The batteries will stop charging (input relay will open)
The bypass relay will remain opened
The output relay will remain closed
The battery will start providing the DC power to the DC to AC inverter, continuing
to provide uninterrupted AC power to the load
The UPS is now in the Battery state and will indicate an alarm; the UPS will continue to
provide power to the load for a limited time (runtime of the battery backup system
connected to the UPS for the percentage of load connected).
If an internal or an external output power event occurs while operating in Normal mode:
The input relay may open (depending on the internal event)
The output relay will open
The bypass relay will close (assuming the input is not outside of the input bypass
range), continuing to provide minimally conditioned AC power to the load.
The UPS is now in the Bypass state and will indicate an alarm. Refer to
State Transitions Based on External Events
for state transitions based on
input/output events.
Note:
This unit does have short-circuit protection but only when power is being provided
to the load through the inverter. If the unit is in ECO mode or in the bypass state when a
short-circuit occurs on the output of the UPS, the UPS unit may be damaged.
Line Interactive
Normal mode is the default working mode of the line interactive UPS units. When the
UPS is operating in Normal mode it provides a stable AC power output. The battery is
always being charged or maintained if there is input power within range. In Normal
mode, the input and output relays are closed, and the INV relay is switched away from
the inverter. In this state the input power is filtered and provided directly to the load. If
the input voltage is surging or sagging, the UPS will transition to the AVR state. In the
AVR state, if the input voltage needs to be increased, the boost and buck relays will be
in the boost position (up). If the input voltage needs to be decreased, the boost and
buck relays will be in the buck position (down).
If the input power is lost or has anomalies are outside of the set ranges while the UPS is
