5. Static switch module (SSM)
6. Bypass input switch (BIS) S1
7. Handle for the bypass input switch
(BIS)
8. Maintenance bypass switch (MBS)
S2
9. Handle for the maintenance by-
pass switch (MBS)
10. DC-interface compartment
11. Communication interface
12. Connector area
33..33 UUPPSS ooppeerraattiinngg mmooddeess
The UPS operating modes are as follows:
Operating mode Description
Normal operating modes:
Double conversion mode
Critical load is supplied by the inverter, which
derives its power from rectified utility AC power. In
this mode, the DC/DC converter also provides
charging current for the DC source, if needed.
Variable Module Management System (VMMS)
mode
Critical load is supplied by the inverter. The
inverter derives its power from rectified utility AC
power, identically to double conversion mode. In
the VMMS mode, the 93PM G2 UPS system is
able to optimize the load level per power module:
the operating efficiency is significantly improved
when operating load is below 50 % of UPS
capacity. The UPS system will automatically place
the redundant power modules to suspended mode.
In case of any anomalies in utility or a sudden load
increase, the suspended power modules are able
to transfer to online mode with less than 2 ms
transition time.
Energy Saver System (ESS) mode
Critical load is supported securely by utility power
through the static bypass switch with double
conversion available on-demand with typically less
than a 2 ms transition time, should any abnormal
condition be detected in the utility. Operating the
UPS in the ESS mode increases system efficiency
up to 99 %, allowing significant savings in energy
losses without compromising system reliability
Other operating modes:
EATON 93PM G2 UPS USER’S AND INSTALLATION GUIDE P-164000956
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February 2021 www.eaton.eu 1199
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