ABB OMD800 - Page 8

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AUTOMATIC CONTROL UNIT, OMD800
Figure 2.4 OMD800 have the capability to monitor two three-phase power lines, both able to work
with single phase, too.
OMD800 has an external auxiliary power supply possibility for guarantying an uninterrupted power
supply for the device in the case where the Line 1 and Line 2 are not available.
From the display, user can choose whether the N-line is connected or not.
Figure 2.6 The circuit diagram, when N-line is not connected.
Figure 2.5 An external 24...110 Vdc auxiliary power supply
LINE 1
LINE 2
L1 L2 NL3
1
4
3
2
LN1
L1
L2
N
L3
X11
L1 L2 NL3
X12
1
4
3
2
LN2
L1
L2
N
L3
KA00426
LINE 1
LINE 2
NL1
1
4
3
2
L1
N
X11
L1 N
X12
1
4
3
2
L1
N
KA00425
LINE 1
LINE 2
L1 L2 NL3
1
4
3
2
LN1
L1
L2
N
L3
X11
L1 L2 NL3
X12
1
4
3
2
LN2
L1
L2
N
L3
KA00466
1
2
X41
AUX
LINE 1
LINE 2
L1 N
1
4
3
2
LN1
L1
L2
N
L3
X11
L1 N
X12
1
4
3
2
LN2
L1
L2
N
L3
KA00467
1
2
X41
AUX
LINE 1
LINE 2
L1 L2 L3
1
4
3
2
LN1
L1
L2
L3
X11
L1 L2 L3
X12
1
4
3
2
LN2
L1
L2
L3
KA00468
1
2
X41
AUX