Handling Precautions - Mitsubishi Electric MELPRO A Series Instruction Manual

External connection diagram (Example)
a. Voltage tripping type
a-1 VT from power side
F
VT
BP
CB
Voltage tripping coil
52a Pallet switch
BN
b. No-voltage tripping type
F
VT
CB
No voltage
tripping coil

Handling precautions

1. Panel mounting
①The 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.
③Don't leave rotary switches with halfway (indefinite)
state.
④The RUN LED lights up in the normal condition when the
rated voltage is input. If it still turns off when the
input voltage exceeds 55V, please contact our local
agent and branch office since the relay may fail.
⑤When the operating voltage setting switch is set to
the LOCK, the b contacts open when RUN LED is turned
on. If input voltage is turned to zero from this
state, the b contacts remain open.
E
D
P2
P1
b2
b1
To alarm
MUV-A3V
c1
circuit
c2
E
D
P2
P1
b2
ａ1
To alarm
MUV-A3V
c1
circuit
c2
Fig. 4-3 External connection diagram
a-2 VT from load side
BP
CB
BN
F
●Connect
(Note) In order to avoid unwanted trip
before the relay resets because of CB
close, please set a timer (approx. 2～3s)
as this figure above.
⑥This relay has a built-in capacitor to hold the power
supply up to the operating time setting in case of power
failure. If the power outage lasts approximately 10
seconds or longer, the capacitor runs out of charge and
the RUN LED of the relay turns off. When power is
restored from this state, it takes up to 2 seconds to
resume operation and to reset output contacts.
⑦If the input voltage at the time of power recovery is
less than the setting value, the output contacts are
once reset as in the case of ⑥ above and then operated
after the setting operation time. If the energizing time
is short, the capacitor may not be fully charged, and
the relay may not operate properly.
Input voltage
b contact
(Setting: 100V)
10
b1
MUV-A3V
c1
P2
P1
T
T
Voltage
tripping
coil
52a
Pallet
switch
VT
E
D
line.
90V
0V
2s
ON
OFF
Operation time
b2
To alarm
circuit
c2
ON
JEP0-IL9556