Internal Connection Diagram - Mitsubishi Electric MELPRO-A Series Instruction Manual

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
setting.
・V , I , and phase measurement
0 0
・V , I pickup
0 0
・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 numerical
display is turned off.
Don't leave the switches with
halfway state.
Operation indicator reset lever
Move this lever up and down, then the operation
indicator resets.
(Note) Don't pull the lever strongly.

Internal connection diagram

switch
this
Fig. 7-1 Structure of MDG-A4 series (front view)
※ RD-type has shorting bar in I circuit.
0
a 190V
V
V
0
0
Level assessment
a 110V
f +
Directional
assessment
+
Z1
I
0
I
0
Level assessment
Z2
P1
Auxiliary
power supply
Power supply
P2
Continuous
monitoring
Power circuit
monitoring
Fig. 7-2 Internal connection diagram
Operation indicator
The indicator turns from
orange color when the protection element
is put into operation.
Operation indicator
RUN indicator
Output
X0
contact
X0
X1
Output
contact
X1
9
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. In addition, the
output contact is reset from
self-hold state.
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
SW2 Output contact
ON Self-hold (Ho.)
OFF Auto-reset (FU.)
Factory settings are set to a
default of OFF.
black into
a11
Output contact
a12
a21
Output contact
a22
E
JEP0-IL9559