SMARTZONE UPS USER MANUAL
9
frequency range with no derating.
Note:
The Generator mode is saved on the 5-10kVA UPS units; when the 5-10kVA UPS unit is
powered OFF and restarted, the unit will restart in Generator mode.
While the UPS is operating in Generator mode, if the input power is lost or has any
other anomalies that are outside of the operating range of the UPS,
•
The batteries will stop charging (input relay will open)
•
The bypass relay will remain opened
•
The output relay will remain closed and 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. 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 Generator mode, the
input and output relays open and the bypass relay closes (assuming the input is not
outside of the input bypass range), continuing to provide unconditioned AC power to the
load. The UPS is now in the Bypass state with no frequency or voltage conditioning.
Output frequency and voltage will equal input frequency and voltage. Refer to
Appendix C: State Transitions Based on External Events
Note:
The UPS does not have output short circuit protection in the Bypass state.
UPS States
The UPS automatically transitions to different states based on internal or external
events; the user may also force the UPS into some states through one of the user
interfaces. There are eight different states that the UPS may be in. Refer to
C: State Transitions Based on External Events
.
Normal State
The UPS will go into the normal state when the UPS is set to Normal Mode at setup
time. This is the default mode and state that the UPS will power up in on new units from
the factory. If the UPS is set for Normal Mode, the Normal state is the default state
where the UPS will return to after the internal or external event has been cleared or the
forced state has expired.
