LEGRAND Megaline Rack Operating And Maintenance Manual page 43

4. Customising the UPS operating mode
4.5 UPS Setup
Output
Voltage
Frequency
N+x Redundancy
NB: Redundancy Settings
This function is used to manage the redundancy of the power modules. For example: a load requires N power modules; X power
modules must be added to achieve N+X redundancy.
If the load applied exceeds the power supplied by N modules during operation, the UPS will signal the lack of redundancy.
A numerical example is given below:
Load
Input
PLL Enable
Extended PLL Range
NB: PLL Settings.
The PLL function ensures the UPS output frequency is synchronised with the input so that the changeover at zero takes
place at the exact same time. Should the by-pass intervene, e.g. due to unanticipated loads, input-output synchronisation
is guaranteed.
42
®
ð
Power
boards
3700 3
3700 4
1500 4
1000 4
ð
Voltage To set the UPS output voltage (V)
To set the UPS output frequency (Hz)
Nominal Value: to set a numerical value for the output
frequency (50 or 60)
Frequency Auto Selection:
If enabled, the UPS reads the frequency of the input
voltage and then synchronises the output to the same
value.
If disabled, the UPS uses the set Nominal Value.
To set the number of redundant boards
N+x Redundancy
(refer to NB: Redundancy Settings)
Total
Redundancy
power (W)
3750
5000
5000
5000
If enabled, the UPS synchronises the output sine wave
with the input
PLL Enable If disabled, the output voltage is not synchronised with
the input. This is indicated by the flashing of the status
warning light (green)
If enabled, the UPS synchronises the output voltage with
the input for variations in frequency of +/-14%
Extended PLL
the nominal value.
Range
If disabled, the PLL is synchronised for variations in
frequency of +/-2%.
Redundancy
alarm (W)
0 no
1 3750
2 2500
3 1250
Overload
alarm (W)
3750
5000
5000
5000