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Structure
RUN indicated LED (Green)
It shows the result of self-
monitoring. It lights up in
normal condition.
Numerical display LED
Following item is displayed
by indicator select switch
setting.
・Voltage measurement
・Pickup
・Setting value
・Fault record
・Clear fault record
・Forced operation (test)
Indicator select switch
The numerical display shows
according to this selection
switch.
Don't
leave
switch with halfway state.
Setting switches for
operation value and time
Set the setting values. The
black part is equal to maximum
value,
but
the
display is turned off.
Don't leave the switches with
halfway state.
Operating Description
1. Protection function
①The power supply can be derived from VT secondary.
Even if the voltage becomes 0V (blackout) during
operation, the internal power supply works up to
5 seconds.
②If input voltage is less than or equal to the
setting value, the operation timer starts. The
relay actuates the output contact and operation
indicator after a preset time of the operation
timer.
③After the relay operation, if input voltage is
greater than the setting value, the output contact
automatically resets.
The operation indicator keeps the operation status
(orange color). To reset the indicator, move the
reset lever up and down.
this
numerical
Fig. 4-1 Structure of MUV-A3 series (front view)
Operation indicator
The indicator turns from black into orange
color when the protection element is put into
operation.
Operation indicator reset lever
Move this lever up and down, then the operation indicator
resets.
(Note) Don't pull the lever strongly.
2. RUN display (Self-monitoring function)
This
relay
monitors
circuit, and program data at all time. The RUN LED
(green) lights up in the normal condition.
In the abnormal condition, the RUN LED goes out and
the error message Ｅ ｒ ｒ
numerical display LED, with the output contact
locked.
Since power supply is derived from VT secondary
voltage, the RUN LED lights off when the voltage
input is less than approx. 50V.
8
Test button
By turning the indicator select
switch to "TEST" and pushing
"TEST" button for 2 seconds or
more, output contact can be
forced to operate (except for
the case of LOCK setting).
CPU reset button
While this button is pressed,
the relay function is locked
and the RUN indicated LED is
turned off.
Setting switches for using
condition
Don't use any tool with a sharp
point when the switches are set.
(It may cause damage to the switch
lever.)
SW1
Frequency
ON
50Hz
OFF
60Hz
Factory settings are set to a
default of OFF.
control
voltage,
is displayed on the
JEP0-IL9556
electric
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