CIRCUTOR CVM-B Series - Manual (Page 15)

Measurement system:
Secondary winding of the current transformer:
(MC3 type transformer)
Secondary winding of the neutral current transformer:
Power
Supply
V
L1
L1
L2
L3
N V
L3 L2
V
L1
V
V
L1
V
L2
V
L3
a b
A B
a b
A B
3P1
2P1
1P1
3P2
2P2
1P2
Br
own/Gr
een
Gr
ey/P
ink
Gr
een/W
hit
e
Red/Blue
S1 S2 S1 S2 S1 S2
L1
P1 P2
L2 L3
P1 P2P1 P2
S1 S2
LN
P1 P2
N V
REF REF
N
S1 S2
P1 P2
POWER SUPPLY
~ ~
+ -
V
L2
V
L3
N
V
REF
N
REF
a b
A B
V
REF
N
REF
LOAD
figure 4: Three-phase measuring with a 4-wire connection (MC3 type transformer (/0�250))�
NB: The unit can calculate the neutral current without having to measure it, option: Calculated
current
.
The MC3 transformer secondary value is set to 0.250 A.
The transformer for measuring the LN neutral current cannot be
MC type.
15 Instruction Manual
CVM-B100 - CVM-B150