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Chapter 1 Introduction
6
4. ECO Mode
If the load has no requirement for power quality but has a high requirement for
efficiency, then the UPS can be set in ECO mode. In this mode, the system will
power the load through the static bypass switch and the rectifier will charge the
batteries. When the bypass source fails or out of normal range, the UPS will revert
back to normal mode and powers the load through the batteries. The total transfer
time will be less than 15 msecs. When the bypass source recovers back to normal,
the system will return to ECO mode automatically and the system efficiency is
greatly improved, as shown in Figure 1-8. Note that the ECO mode function can
only be set by qualified personnel and applies to single UPS modules only.
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-~
~
outputMains
Bypass
Figure 1-8 ECO mode
5. Maintenance Mode
When the UPS has to be repaired or has to undergo routine maintenance, the UPS
can be set to maintenance mode by switching on the maintenance bypass circuit
breaker. The load will be powered from the maintenance bypass supply without
interruption.
During maintenance, the circuit breakers Q1, Q2, QF1 and Q5 should be switched
off to ensure the safety of maintenance personnel. See Figure 1-9.
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OutputMains
Bypass
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-~
Q5
QF1
Q1
Q2
Q3BP
Figure 1-9