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2.1 LED DISPLAY
1) Load on inverter [ LOAD ON INVERTER ](green)
Illuminates when power is supplied from inverter to the critical load.
(Indicates the state of inverter transfer switch "52C".)
2) Battery operation [ BATTERY OP. ](yellow)
Illuminates when power is supplied from batteries following a power failure.
3) Load on bypass [ LOAD ON BYPASS ](yellow)
Illuminates when power is supplied to load devices by static bypass.
(Indicates the state of bypass transfer switch "52S".)
4) Overload [ OVERLOAD ](yellow)
Illuminates in overload condition.
5) LCD fault [ LCD FAULT ](red)
Illuminates when an error occurs.
6) UPS fault [ UPS FAULT ](red) [Annunciator: intermittent or constant tones]
Illuminates when an error occurs in the system. In this case, the details of the error are
indicated on the display panel.
2.2 EPO BUTTON (Emergency Power Off button) (7)
When activated, the Emergency Power Off (EPO) function shuts down the UPS module. The
critical load will lose power and also shutdown. The EPO function can be performed both locally or
remotely.
2.3 LIQUID CRYSTAL DISPLAY (8)
The Liquid Crystal Display (LCD) touch panel indicates power flow, measured values, operational
guidance, data records and error messages. The LCD panel has a back-light which facilitates
viewing in different ambient lighting conditions. The LCD will automatically clear and turn off, if the
screen is not activated within 3 minute period. The LCD is turned back on when it is touched again.
Every error indicator will be cleared 24 hours after the event and can be reproduced by pressing
any key on the panel.
9900D SERIES UPS
OWNERS / TECHNICAL MANUAL
MITSUBISHI ELECTRIC 9900D SERIES UPS
Page Number:
2-2
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