Mitsubishi Electric C Series Handling And Maintenance page 65

(iii)-2 NF400-UEW(4P), NF800-UEW
a) Detach the four cover mount screws (A) to remove the cover.
b) Fasten the electric operation type circuit-breaker using the four
breaker mount screws (B).
c) Connect electric operation unit to the terminal of the operational
circuit.
d) Fix the cover with the four cover mount screws (A).
❈ If the electric operation unit is to be removed from the circuit-breaker
for maintenance and inspection, the removal shall be made ac-
cording to the procedure for NF400-UEW(3P).
(iv) Flush plate type (refer to Fig. 4) ( U-series)
a) Maintenance and inspection of electrical operation unit (Removal
of this unit only) Same as for front connection/rear connection types.
Note. When mounting it, the smaller slider out of the two sorts of
sliders (insulating plates) between the bracket and cover
shall be incorporated into the upper plane, and the notched
portion of the larger one into the lower left corner.
(c) Motor-operated type electric operation circuitry
Note. The portion indicated by broken lines in the circuitry, is
added in the case of automatic resetting.
(1) Control circuit 1.
(400, 630 and 800AF)
G
Earth terminal
(DC-) A1
Control
E1
power
supply
T1
A2
E2
ON
B
OFF
Reset
C
ALa
D
M : Motor
X : Relay for ON operation
Y : Relay for OFF operation
Z : Relay for changing motor polarity
T1 : Timer for antipumping
T2 : Timer for automatic reset
LS : Limit switch
AL : Alarm switch for automatic reset (a contact)
Note 1. The above diagram indicates the MCCB when it is OFF.
Note 2. Since the electric operation is of self-sustaining type, instantaneous closing of op-
erational switch only ensures the required operation.
Note 3. The portion surrounded by the alternate long and short line represents the interior of
the electrical operation unit which has already been wired. Note that the (T2) ondelay
timer for the alarm switch for automatic resetting is not standardized. The user is
requested to spacify it.
Note 4. The relay has polarity in case of DC operation. Decide tha polarity you desires as
shown in the above diagram.
63
Z2
R3 R4
M
R1 R2
Z1
LS
Z
X1 Y1
X
Y
Z4a Z4b
T1b
R
Y2a T2a
Z3
(2) Control circuit 2.
(NF1000-SEW to NF1600-SEW)
Earth terminal
( DC– )
P2
Operational
power supply
P1
T2
S1
ON
OFF
S4
Reset
95
AL
(A)
(C)
Plane
F
Spacer
X
Y
Z
T1
X
Y
Y X
Z
X
Y
X
T1
T2
Y
T2
Cover
Frame
(D) Flash
plate
Handle
NFB
Fig. 4
Z
M
LS