Chapter 7 Operator Control and Display Panel
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MUST400_User manual_EN_REV02 User Manual
7.1.1 Mimic Current Path
The LEDs shown on the mimic current path represent the various UPS power paths and show the current
UPS operating status. The status description of indicators is shown in table.7-2.
Table.7- 2: Status Description of Indicator
Indicator
State
Description
Rectifier
indicator
Steady green
Rectifier of all modules is normal
Flashing green
At least one of module rectifier is starting
Steady red
At least one Rectifier of module fault
Flashing red
Main input of at least one module is abnormal
Off
Rectifier is not working
Battery
indicator
Steady green
Battery is charging
Flashing green
Battery is discharging
Steady red
Battery is abnormal (battery failure, no battery or battery reverse) or
battery converter is abnormal (failure, over current or over
temperature) , EOD
Flashing red
Battery voltage is low
Off
Battery and battery converter is normal, battery is not charging
Bypass
indicator
Steady green
UPS is working in bypass mode
Steady red
Bypass is failure
Flashing red
Bypass voltage is abnormal
Off
Bypass is normal and is not working
Inverter
indicator
Steady green
Inverter is feeding the load
Flashing green
Inverter is starting, or UPS is working in ECO mode
Steady red
At least one module’s inverter
is failure, and inverter is not feeding the
load
Flashing red
Inverter is feeding load, and at least one module’s inverter is failure
Off
Inverter is not working in all modules
Load
indicator
Steady green
UPS output is on and is normal
Steady red
UPS output is overload and time is over, or output is shorten, or output
has no power supply
Flashing red
UPS is overload
Off
No output voltage
Status
indicator
Steady green
Normal operation
Steady red
Fault
7.1.2 Audible Alarm (buzzer)
There are two different types of audible alarm during UPS operation as shown in table.7-3.
Table.7- 3: Description of Audible Alarm
Alarm
Purpose
Two short, one long
when system has general alarm (for example: main input abnormal), this
audible alarm can be heard
Continuous alarm
When system has serious faults (for example: fuse or hardware fault), this
audible alarm can be heard
