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ABB MMCO-2 Instruction Leaflet page 28

Multi-phase overcurrent relay

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51
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51
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51
51
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OTHER
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51
KEYBORRD
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7 PUSHBUTTONS
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INST
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52
REAL
TIME
CLOCK
POWER
SUPPLY
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N
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>
/
DISPLAY
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v
Vl
+ 5
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OR
7
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51
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6
7
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OPTION
2 OR 3
INST
.
LOCKOUT
(
IF USED
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MUX
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OC
51
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6
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7
1
RC
/
DC
A
/
D
RY
MONITOR
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±
520
0
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RANGING
MICRO
-
COMPUTER
I
OB
TRIP
-
TEST
*
TRIP
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4
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CPTICN
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DERD
-
MRN
CIRCUIT
/
/
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ALTERNATE
R
POS
X
REMOTE
T RESET
LA
COMMUNICATIONS
OPTION
7
51
IS
-
o
-
X
r
-
O
-
X
OPTO
-
1
ISO
51
20
NEG
REMOTE
RESET
OPTION
ALTERNATE B
POS
4
GRD
30
CKD
-
10 OR H 3
)
CKRC
)
^
DIREC
DIREC
L
-
O
-
*
OPTO
51
ISO
18
51
19
OPTO
ISO
Q
-
X
51
20
NEG
DIRECTIONAL
OPTION
51
-
TIME
OVERCURRENT RELAY MMCO
52
-
CIRCUIT BREAKER
CM
1609 C 74
Sub 1
CM
-
J
Figure 12
.
MMCO External Schematic
co
CM

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