16
JEP0-IL9553
Handling precautions
1. Panel mounting
①
Please connect the input terminals of relay
corresponding to the polarity of CT secondary output.
(Refer to Fig. 1-5)
If the connection of polarity is in the wrong, the relay
may not operate when a fault occurs.
②
When the existing product is replaced by MOC-A3 type,
the adapter may be necessary for some type.
③
The relay of unit-drawer type (RD type) can be drawn
out from the case.
2. Use and operation
①
About 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.
②
About MOC-A3T-R relay
In regard to this current tripping relay, current flows
into the tripping coil of CB by opening the b contact
of this relay, so the contact may be damaged if the
current is too big.
Therefore, please disconnect the output contact from
the tripping coil of CB and see if b contacts (between
T1R and C2T2R, T1T and C2T2T) are normally closed.
③
Please 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.
④
Don't leave rotary switches with halfway (indefinite)
state.
⑤
The RUN LED lights up in the normal condition when the
current input is 1.5A or more. If it still turns off
when the current input exceeds 1.5A, please contact our
local agent and branch office since the relay may fail.
R
S
T
k
(E )
D
ℓ
C1R T1R
T1T C1T
a2
a1
C2 C2
T2R T2T
k
ℓ
a) Incorrect connection
R
S
T
k
(E )
D
ℓ
C1R T1R
T1T C1T
a2
a1
C2 C2
T2R T2T
k
ℓ
b) Correct connection
This figure shows the connection of current tripping
type. For voltage tripping type, the terminal number
should be changed as below.
T1R
⇒
T1, T1T
⇒
T2, C2T2R
⇒
C2R, C2T2T
⇒
C2T
Fig. 1-5 Connection example
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
①
The current input waveform should be a sine wave with
little distortion.
②
During the test, set the position of the indicator
select switch to "LAPSE". 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), execute the test at the
manufacturer-defined characteristic control point
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.
2. Withstand voltage test
a. Apply 2000V AC (commercial frequency) between all
circuits and external box (fixing screw for mounting)
for one minute, and make sure that there is no problem.
Type
Voltage applied terminals
MOC-A3V
External box
(Fixing screw for
mounting)
MOC-A3T
External box
(Fixing screw for
mounting)
b. Apply 2000V AC (commercial frequency) between separate
circuits for one minute, and make sure that there is
no problem.
Type
Voltage applied terminals
MOC-A3V
MOC-A3T
T2
T1 a1
C1R C1T
C2R C2T
a2
C1R
C2
T2R
T1R a1
C1T
T1T a2
C2
T2T
C1R
C2
T2R
T1R
C1T
C2
T2T
T1T
a1
C1R C2R
C1T C2T
C2R
C1T C2T
T1 a1
T2 a2
a1
a2
T1
T2
C1R
C2
T2R
T1R
C1T
C2
T2T
T1T
C1R
a2
