1 Control panel 8 Rectifier input switch (optional)
2 Door latch 9 Battery breaker (optional)
3 Communications area 10 MBS (optional)
4 UPM 1 11 Area for internal batteries
5 UPM 2 12 Communication cable conduit
6 UPM 3 13 Static bypass section
7 UPM 4 14 Power cable connections
3.2 UPS operating modes
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 battery charg-
er also provides charging current for the
battery, if needed.
- Variable Module Management System
(VMMS) mode
Critical load is supplied by the inverter. The
inverter derives its power from rectified util-
ity AC power, identically to double conver-
sion mode. In the VMMS mode, the 93PM
UPS system is able to optimise the load
level per power module: the operating effi-
ciency is significantly improved when oper-
ating load is below 50% of UPS capacity.
The UPS system will automatically place
the redundant power modules to suspen-
ded mode. In case of any anomalies in utili-
ty or a sudden load increase, the suspen-
ded 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 de-
tected in the utility. When operating in the
ESS mode, the load is protected with inher-
ent surge suppression. Operating the UPS
in the ESS mode increases system effi-
ciency up to 99%, allowing significant sav-
ings in energy losses without compromis-
ing system reliability
Eaton 93PM UPS 30–200 kVA User's and installation guide
©
Eaton Corporation plc 2017. All rights reserved. Revision: 005 Document ID: P-164000249 18 (126)
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