
Xtreme Power Conversion Corporation
M90S-4S User’s Manual
Page 26
Uninterruptible Power Supply
3.3.6 ECO Mode
The ECO Mode is enabled through the LCD setting menu. In ECO mode, the load is powered by bypass when the
bypass voltage and frequency are within the acceptable ranges. If the bypass is out of range, the UPS will transfer
the power source of load from bypass to inverter. In order to shorten the transfer time, the rectifier and inverter
are working when the UPS is in ECO mode.
ECO Mode Diagram
3.3.7 Shutdown Mode
When the UPS is in the off state and the utility power source is absent, the UPS will enter shutdown mode. Or
when the UPS has discharged the battery to the cut-off level, the UPS will enter shutdown mode as well. When the
UPS enters this mode, it is going to shut off the control power of UPS. The rectifier, charger and inverter are all in
off state.
Bypass
Main
Load
Rectifier
Inverter
STS
Q1
Input Breaker
Q2
Maintenance Breaker
Q3
Output Breaker
Battery Breaker
Inverter
Relay
Shutdown Mode Diagram