Handling Precautions - Mitsubishi Electric MELPRO-A Series Instruction Manual

Handling precautions

1. Panel mounting
①Be sure to connect the "E" terminal of the relay to D-
class grounding.
②The relay of unit-drawer type (RD type) can be drawn
out from the case.
2. Use and operation
①About the setting switches for using condition, factory
settings are set to a default of OFF. So it is necessary
to set the switches according to the conditions.
②Please refrain from changing the setting value during
operation, since unwanted operation may occur. However,
if the setting change is unavoidable, please press the
CPU reset button in order to lock the relay function.
Test
A relay test is carried out sufficiently before shipment,
but at the following cases, it is recommended the test
should be carried out again.
a. When the products are delivered and unpacked
b. At the time of starting operation of equipment
c. At the time of periodic inspection (Usually once a
year)
1. At the time of testing
①The input waveform should be a sine wave with little
distortion.
②During the test, set the position of the indicator
select switch to "V
0
MEASURE", or "PICKUP". Set the other setting switches
according to the test conditions of the operating
characteristic control point.
③ If user-defined control point is specified (e.g.
accuracy of relay characteristic is controlled at
service conditions),
manufacturer-defined
before in-service operation and then check accuracy of
the relay. After that, execute the test at the user-
defined control point, and use this data as a later
reference.
④Perform the test in combination with ZCT (MZT type) and
ZVT (MPD-3 type). Otherwise, direct input to the relay
may cause burning out.
2. Withstand voltage test
a. Please disconnect the relay from ZCT and ZVT. If a
voltage higher than the rated value is applied, it
may burn out.
MEASURE", "I MEASURE", "PHASE
0
execute the test
characteristic control
③Don't leave rotary switches with halfway (indefinite)
state.
④The RUN LED lights up in the normal condition when the
rated auxiliary power supply is input. If it still turns
off when the auxiliary power supply voltage exceeds 85V,
please contact our local agent and branch office since
the relay may fail.
3. Connection of V
①Be sure to connect the V
MPD-3 type ZVT or the MDG relay supplying V
on the relay power supply.
b. Apply 2000V AC (commercial frequency) between all
circuits and earth (E terminal) for one minute, and
make sure that there is no problem.
Y1 Z1
Y2 Z2
c. Apply 2000V AC (commercial frequency) between separate
circuits for one minute, and make sure that there is
no problem.
at the
point
Note) Never apply a test voltage between these circuits.
～
Y1
Y2
～
Z1 Z2
15
input terminal
0
input terminal (Y1-Y2) to the
0
Voltage applied terminals
P1 M a11 a12
P2 N a21 a22
Voltage applied terminals
P2
P1
Y1 Y2
a11
Z1 Z2
M N
P2
P1
P2
P1
P1 P2
, ～
Z1 Y1 M
Z2 Y2
M N
when turning
0
E
a11 a12 a21 a22
a11 a12 a21 a22
a12 a21 a22
a11 a12 a21 a22
Y1 Y2
Z2
Z1
M N
,
N
JEP0-IL9554