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CENTRIC 3x480, User Guide, rel. 1.7
25
Figure 18: "Setup > SYSTEM" options
7.2.1.1
SETUP > SYSTEM > NOMINAL SETTINGS
•
Nominal system output voltage:
you can modify the nominal output voltage to any of the values
listed on the screen, but first you must turn off the UPS by means of the ON/OFF button on the main
menu screen. Obviously, you should not change the output voltage unless you are sure that the new
value is appropriate for the load devices. An inappropriate output voltage can cause permanent
damage to the load devices.
•
Nominal system frequency:
the output frequency of the UPS can be set to either 50 Hz or 60 Hz.
Before modifying the UPS nominal frequency, the UPS must be turned off by means of the ON/OFF
button on the main menu screen. Obviously, the nominal system frequency chosen should be the same
as the nominal frequency of the rectifier input and bypass voltage.
•
Frequency tracking range:
The inverter frequency is normally governed by the frequency of the
bypass voltage, which will be a nominal 50 or 60 Hz. There may be natural fluctuations in the bypass
frequency. The frequency tracking range lets you determine how far away from the nominal frequency
the inverter will follow the bypass frequency. When the bypass frequency fluctuation exceeds the
frequency tracking range, the inverter stops following the bypass frequency and begins instead to
determine its frequency by means of the UPS's internal clock.
For example, the bypass frequency is a nominal 50 Hz, and you have set the frequency tracking range to
be
±
2 Hz. In this case, as long as the bypass frequency remains within the range of 48–52 Hz, the inverter
frequency will mirror it. When the bypass frequency passes these boundaries, the inverter frequency
ceases to be determined by the bypass frequency and comes under the control of the UPS's internal clock
(this is called "free-running mode"). When the bypass frequency returns to the range of 48–52 Hz, free-
running mode ceases and the inverter frequency again comes under the control of the bypass frequency.
7.2.1.2
SETUP > SYSTEM > NUMBER OF MODULES
This function is used to inform the
Centric
of:
•
the total number of UPS modules to be used,
•
how many of the UPS modules will provide redundancy, and
•
the total number of dc-to-dc converter modules.
