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screen as "Virtual LEDs." For setting, see Section 4.2.6.10. For operation, see Section 4.2.1. The
TRIP LED and an operated LED if latching operation is selected, must be reset by the user, either
by pressing the RESET key, by energising a binary input which has been programmed for
'Remote Reset' operation, or by a communications command. Other LEDs operate as long as a
signal is present. The RESET key is ineffective for these LEDs. Further, the TRIP LED is
controlled with the scheme switch [AOLED] as to whether or not it is energised by the output of an
alarm element such as OC4 ALARM, EF4 ALARM, etc..
The CB CLOSED and CB OPEN LEDs indicate CB condition. The CB CLOSED LED color can
be changed to one of three colors-(Red / Green / Yellow) .The LOCAL / REMOTE LED indicates
CB control hierarchy. When the LOCAL LED is lit , CB can be controlled by ○ and ｜ keys
on front panel. When the REMOTE LED lit , CB can be controlled by binary input signal or
communication. When neither of these LEDs is lit , the CB control function is disable.
The ▼ key starts the Digest screen (Metering, Virtual LED) indication on LCD. The ▼ key
makes screen change "Virtual LED" → "Metering" →"Indication and back-light off" when the
LCD is on the Digest screen.
The ENTER key starts the Main menu indication on LCD.
The END key clears the LCD indication and turns off the LCD back-light when the LCD is on
the "MAIN MENU".
The operation keys are used to display the records, status and setting data on the LCD, to input
settings or to change settings.
The USB connector is a B-type connector. This connector is used for connection with a local
personal computer.
Light emitting
diodes (LED)
To a local PC
Figure 3.1.3 Front Panel (model 400 / 420 / 401 / 421 / 820 / 821 )
Operation keys
63
6 F 2 T 0 1 7 2
Liquid crystal
display
Light emitting
diodes (LED)
Control keys
USB type B connector
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