MGE UPS Systems EPS 7000 - Manual (Page 17)

Introduction page 1 — 7
Users Manual
1.4.2.2 On-Battery Operation
If the main AC input source (mains 1) fails or goes out of tolerance, the charger stops. Power flows from the batteries
to the UPS inverters, which in turn supplies the attached load. When the main AC input source (mains 1) returns, the
charger restarts automatically and the UPS resumes its normal operation. See Figure 1-6.
If the batteries become depleted before the main AC input source (mains 1) returns, the inverter stops and the
attached load is transferred to the bypass AC input source (mains 2) if it is available.
Figure 1-6: On-Battery Operation, Power Flow Diagram.
TO
ATTACHED
LOAD
Main AC input
(mains 1)
Rectifier/battery
charger Inverter
Battery
Rectifier/battery
charger Inverter
Battery
UPS module
UPS module
Static switch
cabinet (SSC)
Additional
modules
Additional
modules
Bypass AC input
(mains 2)
Q2S
Static switch