Mitsubishi Electric MELPRO-A Series Instruction Manual page 13

External connection diagram (Example)
AC110V
To P1-P2 of
MDG-A3V
(E
CB
AC110V
kt
P1 P2
K k Z1
MDG-A3V
ZCT
ℓ
"MZT" Z2
L
Y1 Y2 E
ℓt
1. For wiring materials from ZCT, ZVT, and V
0.75mm 2 or more and connect their shields to D-class grounding. The cable burden shall be less than 5Ω both ways.
(In the case of 0.75mm
2. The number of MDG-A3V and MVG-A3V relay which can be directly connected from MPD-3 type ZVT is up to 20. However, previous
models (e.g. MDG-A1V or MVG-A1V relay) or another series (e.g. MELPRO-D/S series) are combined, the number of connectable
relays is limited to 5. Don't exceed the maximum number of relay units.
If many units more than the limitation are needed to apply V
terminals. The MDG-A3V relay that supplies V
MPD-3 type ZVT. Each relay directly connected to the ZVT can supply V
3. To supply V voltage from the expansion terminals, the control power of the supply source relay must be turned on.
0
The relay that receives V
not turned on or if it fails. From the viewpoint of system reliability, if up to 20 MDG-A3V relays are installed, it is
recommended to connect directly from the MPD-3 type ZVT.
4. The CB tripping circuit and alarm circuit of MDG-A3V relay for feeder protection are omitted in this figure above.
The same circuit as in the power receiving point is required.
5. This figure is shown about the voltage tripping system. For current tripping system, MGX-1 type auxiliary box is required.
6. For MDG-A3V-RD type relay, please connect terminals between Z2 and Y2 with 2mm
7. Don't connect the "ℓ" terminal of MZT type ZCT to ground.
●Connect line.
ZCT
"MZT"
DS
PF
VT
)
D
CB
CB CB
ZCT ZCT
M
MDG- MDG-
ZCT
A3V A3V
N "MZT"
Same as Same as
on the left on the left
Y1 Y2 E Y1 Y2 E
(E )
D
(E ) (E
D
expansion terminals (M-N), please use 2-core shielded cables with a diameter of
0
2
, one way is about 100 meters.)
voltage from the expansion terminals must receive V
0
supply from the expansion terminals cannot be operated if the control power of the source relay is
0
Fig. 2-4 External connection diagram
AC110V
kt
P1
K k Z1
MDG-A3V
ℓ
Z2
L
ℓt
Y1
PCT
Voltage
tripping
coil
52a
Pallet switch
BN
CB
AC110V
kt
P1 P2
K k Z1
MDG-A3V
ℓ
Z2
L
Y1 Y2 E
ℓt
)
D
voltage, supply V
0
voltage for 20 relay units.
0
13
BP
P2
a11
a12
a21
a22 To alarm circuit
Y2 E
(E )
D
MPD-3C
High-voltage capacitor
N N N
MPD-3W
MPD-3T
Shield cable
Transformer box
N
T
E
(E )
A
CB
ZCT
"MZT"
kt
M
K k Z1
MDG-A3V
N
ℓ
Z2
L
ℓt
(E )
D
(E )
D
from expansion terminals (M-N) to Y1-Y2
0
0
2 cable when sub-unit of the relay is drew out.
Y1(50Hz)
Y1(60Hz)
Y2
(E )
D
CB
AC110V ZCT
MDG-
P1 P2
M
A3V
N
Same as
Y1 Y2 E on the left
Y1 Y2 E
(E )
D
(E )
D
voltage directly from the
JEP0-IL9554