Application Example - Mitsubishi Electric MELPRO-A Series Instruction Manual

Application example

a) Single circuit
ZCT
3
"MZT"
PCT
DS
CB
c) Multiple circuits exceeding 20 relay units
CB
MDG-A3V
ZCT
ZCT
②
3
"MZT" "MZT"
Encircled numbers in the MDG-A3V relay shown above indicate the number of units installed.
For multiple circuits exceeding 20 relay units, supply V
(marked by "※" in the figures).
The MDG-A3V relay that supplies V
Each relay directly connected to the ZVT can supply V
(Note) 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
is 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.
MDG-A3V
ZVT
"MPD-3"
ZCT
" "
MZT
DS
CB
CB
CB
MDG-A3V
ZCT
③
3
"MZT"
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
0
Fig. 2-3 Application examples of MDG-A3V type relay
b) Multiple circuits
ZCT
"MZT"
"
PCT
DS
CB
CB
ZCT
"MZT"
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.
(Supply V from MPD-3 type ZVT and V
0
3
PCT
"
CB
MDG-A3V
MDG-A3V
ZCT
④
3
3
"MZT"
voltage from the V
0 0
voltage for 20 relay units.
0
12
(Directly supply V
3
"
MPD-3
CB
MDG-A3V
ZCT
3
"MZT"
expansion terminals of MDG-A3V relay)
0
MDG-A3V
①
ZVT
"
MPD-3
CB
MDG-A3V
ZCT
⑳ ㉑
3
"MZT"
※
expansion terminals (M-N) of the MDG-A3V relay
voltage directly from the MPD-3 type ZVT.
0
from MPD-3 type ZVT)
0
MDG-A3V
ZVT
"
MDG-A3V
3
CB
MDG-A3V
ZCT
㉒
3
"MZT"
JEP0-IL9554