12 Shield T3 60 – 500KVA User Manual
Danger
During Maintenance mode, dangerous voltages are present on the terminal of
input, output and neutral, even with all the modules and the LCD turned off.
The UPS which without External maintenance switch in Maintenance Mode,
dangerous voltages are present on terminal and internal Copper bar.
1.4.5
ECO Mode
The economy control operation (ECO) mode is an energy-saving mode, In
ECO mode, when the bypass input voltage is within the ECO voltage range,
the static bypass turns on, and the bypass supplies power, and inverter is
standby. When the bypass input voltage is beyond the ECO voltage range,
the UPS transfers from bypass mode to normal mode.
Rectifier
AC/DC
Main
Static Bypass
Manual Bypass
Inverter
DC/AC
Charge/
Discharge
Output
Battery
Bypass
Figure1-7 UPS conceptual diagram in ECO Mode
o
Note
There is a short interruption time (less than 10ms) when transfer from ECO mode to
battery mode, it must be sure that the
interruption
has no effect on loads.
1.4.6
Auto-restart Mode
The battery may become exhausted following an extended AC mains failure.
The inverter shuts down when the battery reaches the End of Discharge
Voltage (EOD). The UPS may be programmed to “System Auto
-Start Mode
after EOD”. The system starts after a del
ay time when the AC main recovers.
The mode and the delay time are programmed by the commissioning
engineer.
1.4.7
Frequency Converter Mode
By setting the UPS to Frequency Converter mode, the UPS could present a stable
output of fixed frequency (50 or 60Hz), and the bypass static switch is not available.
