SMARTZONE UPS USER MANUAL
8
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
The UPS may be set to Convert Frequency (CF) mode to increase the allowable input
frequency range of the UPS while maintaining the desired output frequency. Setting the
UPS to CF mode may require the UPS unit to be derated. The 5-10kVA 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. The 10-20kVA 3-phase UPS units in CF mode
have no derating and will maintain a 50Hz or 60Hz output frequency with an input
frequency from 46Hz to 64Hz. When CF mode is set, the Bypass state is automatically
disabled (the unit cannot switch to the Bypass state under any conditions, frequency
conversion is not supported through the bypass path).
While the UPS is operating in CF mode, if the input power is lost or has any other
anomalies that are outside of the set ranges:
•
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 CF mode, the output
relay will open and the output will shut down. AC power to the load will be lost. Refer to
Appendix C: State Transitions Based on External Events
Generator Mode
The UPS may be set to Generator mode to enable the UPS to have a wider input
frequency range (40Hz to 70Hz). Setting the UPS to Generator mode may require the
UPS unit to be derated. The 5-10kVA single-phase UPS units in Generator mode are
derated to 75% of the maximum output but will maintain a 50Hz or 60Hz output
frequency over the full input frequency range. The 10-20kVA 3-phase UPS units do not
have a Generator mode setting. These units always operate with a wider input
