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7.10. Diagnosis:
Site engineer can diagnose voltage, Current transformer connection
& phase sequence.
a.) Voltage Diagnosis: Site engineer can check whether voltage
is present at voltage input or not. if voltage
is below 45 VLL or 25 VLN, meter will read it
as no voltage.
Reasons for Voltage not present:
a.) Loose connections
b.) Wire break.
c.) Phase missing from the source.
d.) Fuse connected at input voltage might got blown off.
LCD
Series
ENERSOL
MFLR09
PROG
COM
V RV: No
YV: Yes BV:Yes
Input voltage connection is at terminal
10, 11 & 12 (13 for neutral).
if voltage present only at Y and B
terminal, than display will be shown
like this.
Sample Display read as
R Voltage - No connected
Y Voltage - Connected & greater than 25 VLN.
B Voltage - Connected & greater than 25 VLN.
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
11
11
12
12
13
13
14
14
15
15
16
16
17
17
18
18
Voltage inputs 80 = 480VAC LL
Voltage inputs 80 = 480VAC LL
Current Input: 50mA to 60A
Current Input: 50mA to 60A
Ph N
Ph N
Aux. Sup.
90-300V, 2VA
Aux. Sup.
90-300V, 2VA
RS485
RS485
DANGER
DANGER
Turn off power before working
Turn off power before working
R CT
R CT
Y CT
Y CT
B CT
B CT
RS485
RS485
V1 V2 V3 Vn
V1 V2 V3 Vn
+
+
-
-
R
Voltage
B
Voltage
Y
Voltage
a.) CT Connections: Site engineer can check whether CT is
connected in correct direction or in reverse
direction
Q: What is P1 and S1, S2 in CT label ?
A: P1 is a label on the CT, which assist us in mounting the
CT in correct orientation. The face of CT where P1 is
written, must be facing toward line side or source side.
S1 and S2 are the secondary wire of CT. MFLR09 whole
current meter comes with 60 Amp CT. The black wire of
CT is S1 and Red wire is S2. Black wire must be connected
to terminal with black rectangle at meter back side as
shown
1 2
3
4
5 6 7
8 9
10 11 12 13 14 15 16 17 18
Voltage inputs 80 = 480VAC LL
Current Input: 50mA to 60A
Ph N
Aux. Sup.
90-300V, 2VA
RS485
DANGER
Turn off power before working
R CT
Y CT
B CT
RS485
V1 V2 V3 Vn
+
-
Black Wire
of R Phase
CT
Black Wire
of B Phase
CT
Black Wire
of Y Phase
CT
Red Wire
of R Phase
CT
Red Wire
of B Phase
CT
Red Wire
of Y Phase
CT
CT Black wire
indication.
