SMARTZONE UPS USER MANUAL
8
operating in Normal mode, the INV relay will switch to the inverter and the battery will
continue to provide uninterrupted AC power to the load through the inverter. The UPS is
now in the Battery state; 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 event occurs while operating in Normal mode, the
input relay remains closed, the INV relay may switch to the inverter (depending on the
internal or external event), and the output relay may open (depending on the internal or
external event). Power may be lost to the load. Refer to
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 (from the battery). If the unit is in Normal mode when a
short-circuit occurs on the output of the UPS, the UPS unit may be damaged.
ECO Mode
This mode is only supported on the on-line double conversion UPS units. When the
UPS is in Normal mode and the power requirements for the load are not critical and the
input source is stable (no power anomalies), the UPS may be set to Energy Savings
(ECO) mode to increase the efficiency of the power supplied through the UPS. In ECO
mode, all voltage increases and decreases will be passed along to the load.
Additionally, any frequency variations on the input will get passed on to the load. When
the UPS is manually configured for ECO mode, the output relay opens, and the bypass
relay closes. The input relay remains closed, continuing to keep the backup batteries
charged. When the UPS is in ECO mode, the source power is minimally conditioned.
If the input power is lost while the UPS is operating in ECO mode:
The batteries will stop charging (input relay will open)
The bypass relay will open
The output relay will close
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. When the UPS is operating in ECO mode, if the
input power has any anomaly (power sags, power surges, under-voltages, over-
voltages, electrical line noises, frequency variations, switching transients, and harmonic
distortion) that are outside of the bypass set ranges:
