54
IV. PARALLEL OPERATION
4.1 Introduction
Two (or more) identical ARTonPlus Series UPSs can be interconnected for parallel operation.
The main purposes for parallel use of ARTonPlus Series UPSs are:
-Redundancy for Increased Reliability
-Power Increase
Although recent UPS designs are perfect and have high MTBF figures, a second (or more) UPS can be
used in parallel with the first one, for supplying the critical load in case of any possible failure of the first
UPS. In such an application the faulty UPS is isolated automatically from the parallel system and the other
UPS (or UPSs) continues to supply the critical load. Use of Redundant UPSs in parallel, therefore, provides
increased reliability for the critical load connected to the parallel system output.
If power demand increases in a certain UPS appliction exceeding the power rating of an already installed
stand-alone UPS, a second (or more) UPS of the same model and power rating can be added in parallel to
the existing UPS to increase the output power capacity.
Schematic diagram of parallel connection of two ARTonPlus Series UPS units is shown in Figure 4.1
3 PHASE
MAINS I/P
3 PHASE
AC Output
Rectifier /
Charger
Battery
(Dual Polarity)
Maintenance
Bypass Switch
Static
Bypass
S2
(F4-F5-F6)
S1
(F1-F2-F3)
S5
(F10-F11-F12)
S3
S4
(F7-F8-F9)
Inverter
K2
K1
̃
-
-
̃
SB
Rectifier /
Charger
Battery
(Dual Polarity)
Maintenance
Bypass Switch
Static
Bypass
S2
(F4-F5-F6)
S1
(F1-F2-F3)
S5
(F10-F11-F12)
S3
S4
(F7-F8-F9)
Inverter
K2
K1
̃
-
-
̃
SB
Figure 4.1
Parallel Connection of two UPSs
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...
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Page 74: ...1 AGKK7080 01 2008...