Application
Application of Pulse Output
S2
S1
S2
S1
S2
S1
S2
S1
S2
S1
S2
S1
V1
V1
N
N
L
L
N
N
PULSE
O/P
PULSE
O/P
+
+
-
-
+
+
-
-
RS485
RS485
V2
V2
V3
V3
+
+
+
+
I
1
I
1
I
2
I
2
I
3
I
3
!
Process Integration
L
L
N
N
!
Energy Controller
MFM374
MFM374
29
selec
Pulse output from MFM374 meter can
be used as alarm generator or total
energy controller by interfacing it with
presettable counter and control circuits
(Contactors, Relay, Trip Circuit).
The counter is loaded with the
maximum energy consumption. When
count reaches setpoint it provides
output to control circuit to take
appropriate action.
Pulse output from MFM374 meter
can be interfaced into a process
through a PLC for on line control of
energy content in the process.
If the PLC has a self excited 24V
digital input, external 24V DC supply
is not needed.
The kWh pulse is also used to derive
average kWh information at the PLC.
24V DC
24V DC
P
L
C
+
+
To
Control
Circuit
C
O
U
N
T
E
R
+
I/P
O
/P