External Accessories - Mitsubishi Electric C Series Handling And Maintenance

3.6.10 External accessories

(1) Electric operation device
1 1
1 Spring-charged type (1) 1 1
• Electric operation
• Manual operation
Caution on remote operation (electric operation)
(i) Press ON switch for 0.1 sec. or more, and OFF switch for 20 msec. or more. Otherwise the
switches may not work.
(ii) The electric operation circuit is set up so OFF switch takes priority. Even if ON switch and OFF
switch are pressed at the same time, therefore, the breaker is turned OFF without fail.
(iii) For the automatically reset type, use a breaker alarm switch (micro-loading) and connect ter-
minals S1, S2 and S4 as shown in following Fig. Since the operation circuit has an ON signal
one-shot output circuit in addition to the function to give priority to the OFF switch, an auto-
matic resetting system with an UVT is set up and such a cycle as ON (invalid) → trip → OFF
(reset) does not repeat even if the breaker has been tripped without UVT excitation when the
ON signal is continually transmitted.
In addtion, when the circuit breaker trip from OFF status by the UVT, the circuit breaker can not
reset automatically. Invalid operation of ON is required. After invalid operation of ON, it resets
automatically.
(iv) If a reset preventive UVT is installed and the UVT has been unexcited when the breaker is
OFF, the breaker mechanism trips but the electric operation unit breaker OFF status is kept
indicated. Even if the UVT is excited afterward, the breaker mechanism is kept tripped and
turning the switch ON trips the mechanism. In such a case, the electric operation unit indicates
tripped (ON is indicated for the 225·250AF). After resetting, turn on the breaker OFF again.
(v) Any articles using same voltage incorporate switching power supply, so they may interfere with
any communications equipment (AM radio, for instance) used in their vicinity. In such a case,
provide a noise filter on the input side. An electrolytic capacitor is used as switching power
supply. Draw your due attention to the use and custody at high temperature.
53
: When ON switch is turned off, a relay drives the motor to reset the latch mecha-
nism, instantaneously turning the breaker ON with the accumulated force of the
input spring. When OFF switch is turned off, the relay drives the motor to turn
the breaker OFF (reset) and charge the input spring at the same time.
: Shift MANU/AUTO selector switch on the cover top to MANU then press ON
button. The latch mechanism is reset and the accumulated force of the input
spring instantaneously turns on the breaker ON.
Turning OFF (resetting)
Draw out the manual handle and reciprocate it a few dozen times to turn the
breaker OFF (reset) and charge the input spring at the same time.
Operation power supply
ON
OFF
AL"a"
P1
P2
Power
S1
supply
module
S2
S4