56
In REDUNDANT parallel mode, the total VA rating of the parallel system is equal to the VA rating of
a single UPS used in the system.
Only after all the UPS units in the system fail and are isolated from the
system, the critical load is transferred to Bypass supply without interruption.
If this mode is active, you will see ‘’REDUNDT. MODE/MS’’ on the LCD panel of one of the UPS units, and
you will see ‘’REDUNDT. MODE/SL’’ on the LCD panels of all the other UPS units connected in the parallel
system.
As explained above, higher degree of reliability for supplying a critical load can be obtained by choosing
REDUNDANT mode for parallel operation and using as many as possible parallel connected UPSs.
4.2.3. N+1 REDUNDANT mode
This mode is used for operation of at least three (2+1 configuration) UPS units connected in parallel for
increased reliability. If this mode is selected, the load is shared equally by each UPS available in the
parallel system (N+1 numbers of UPS units), during normal operation.
In case of a failure of any one of the UPS units, the faulty UPS is isolated from the parallel system and the
critical load is supplied by the remaining N number of UPSs. If any one of those UPS units fails too, then
the critical load is transferred to bypass supply via the static bypass switches of the parallel connected
UPSs. If the faulty UPS returns to normal operation, it joins the parallel system again and starts sharing the
load.
In N+1 REDUNDANT parallel mode, the total VA rating of the parallel system is equal to the VA
rating of a single UPS multiplied by N.
If this mode is active, you will see ‘’N+1 REDUNDANT/MS’’ on the LCD panel of one of the UPS units, and
you will see ‘’N+1 REDUNDANT/SL’’ on the LCD panels of all the other UPS units connected in the parallel
system.
More detailed diagrams for two (or more) ARTonPlus Series UPSs connected in parallel are given in
Figures 4.2 and 4.3
Figure 4.2.a
2 units in parallel
Figure 4.2
ARTonPlus Series Parallel UPS Signal Cable Connections
Parallel
Port 1
Parallel
Port 2
Parallel
Port 1
Parallel
Port 2
Summary of Contents for ARTon Plus series
Page 1: ...SERVICE TRAINING NOTES ARTon Plus SER S UPS 10 15 20 30 40 kVA 3 Faz Giri 3 Faz k...
Page 2: ......
Page 13: ...9 Figure 1 4 2 IGBT Rectifier...
Page 14: ...10 Figure 1 4 3 Transformerless 3 Phase Inverter...
Page 15: ...11 Figure 1 4 4 ARTonPlus series UPS Basic Diagram...
Page 21: ...17 Figure 1 5 3 PFC3P R1 Board...
Page 23: ...19 Figure 1 5 4 IPMD3P Board...
Page 28: ...24 Figure 1 5 5 P3MC R5 Board...
Page 31: ...27 Figure 1 5 6 ADVS01 R1 Board...
Page 33: ...29 Figure 1 5 7 SDXC300 R1 Board...
Page 36: ...32 Figure 1 5 9 ITF3 R2 Board...
Page 39: ...35 Figure 1 5 11 OPS3 Board...
Page 40: ...36...
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Page 73: ......
Page 74: ...1 AGKK7080 01 2008...
