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.
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,
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 "I
0
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).
Otherwise, direct input to the relay may cause burning
out.
2. Withstand voltage test
a. Please disconnect the relay from ZCT. If a voltage
higher than the rated value is applied, it may burn
out.
b. Apply 2000V AC (commercial frequency) between all
circuits and earth (E terminal) for one minute, and
make sure that there is no problem.
① MGR-A3V-R
Voltage applied terminals
a
B1
P1 Z1
b
P2 Z2
B2
MEASURE". Set the other setting
execute the test
characteristic control
c
E
if the setting change is unavoidable, please press the
CPU reset button in order to lock the relay function.
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.
② MGR-A3T-R
P1 Z1
P2 Z2
c. Apply 2000V AC (commercial frequency) between separate
circuits for one minute, and make sure that there is
no problem.
① MGR-A3V-R
② MGR-A3T-R
at the
point
3. Operation characteristics test
①Fig. 3-8 and 3-9 shows the example of test circuit.
②When this test is carried out, be sure that the main
circuit is turned OFF.
③When the rated power supply voltage is applied, the RUN
display LED (green) lights up. This indicates that the
relay works properly.
④When adjusting the test current during the operating
time test, it is recommended to press the CPU reset
button to lock the operation of this relay. If the
operation is locked and the test current is adjusted,
an accurate test is possible.
⑤By 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).
16
Voltage applied terminals
T1 O1
B1 S0 S2
O2
T2 B2 S1
Voltage applied terminals
P1 P2
Z1 Z2
Z1 Z2
Voltage applied terminals
P1 P2
Z1 Z2
Z1 Z2
E
a c
b B1 B2
a c
b B1 B2
P1 P2
T1 O1 B1 S0 S2
O2 B2
T2 S1
O1 B1
T1 S0 S2
T2 O2 B2 S1
P1 P2
[ZCT combination]
JEP0-IL9555