SMARTZONE UPS USER MANUAL
9
The input relay will remain closed (continuing to charge the battery – assuming
the anomaly is still within the operating range of the UPS)
The bypass relay will open
The output relay will close
The rectifier 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 Normal state. If the anomaly is outside of the UPS operating
range, then the UPS will transition to the Battery state. Refer to
Transitions Based on External Events
for state transitions based on input/output
events.
If an internal or an external output event occurs while operating in ECO mode, the
bypass relays will open, the input relay will open and the output will shut down. AC
power to the load will be lost.
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.
Convert Frequency (CF) Mode
This mode is only supported on the on-line double conversion UPS units. The UPS may
be set to CF mode to increase the allowable input frequency range of the UPS while
maintaining the desired output frequency. Setting the UPS to CF mode requires the
UPS unit to be derated. The 1-3kVA UPS units in CF mode are derated to 80% of the
maximum output but will maintain a 50Hz output frequency with an input frequency from
46Hz to 54Hz, or a 60Hz output frequency with an input frequency from 56Hz to 64Hz.
When CF mode is set, the Bypass state is automatically disabled (the unit cannot switch
to the Bypass state under any conditions, and frequency conversion is not supported
through the bypass path).
If the input power is lost or has any anomalies outside of the set ranges while the UPS
is operating in CF mode:
The batteries may 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.