Connect Current Transformers - Fronius Smart Meter 240V-3 UL Instructions De Service

Three-Phase Four-Wire Stinger
Three-Phase Two-Wire Corner Grounded Delta (only 240V-3 and 480V-3)
Connect Current The current transformer must generate 333.33 millivolts AC at rated current. See the cur-
Transformers rent transformer data sheets for CT ratings.
-
-
-
-
-
-
D-
Fronius
Inverter
D+
-
CT L1
WHITE
CT L2
BLACK
CT L3
Source
Faces
Load
Faces
Current
Transformers
D-
Fronius
Inverter
D+
-
CT L1
Shorting
CT L2
Jumper
CT L3
Source
Faces
Load
Faces
Current
Transformers
Do not use ratio or current output such as 1 amp or 5 amp output models!
See the CT data sheets for the maximum input current ratings.
Be careful to match the CTs with the voltage phases. Make sure the CT L1 is measur-
ing the current on the same phase being monitored by the L1 voltage input and the
same for phases L2 and L3. Use the supplied colored labels or colored tape to identify
the CT leads.
To minimize current measurement noise, avoid extending the CT wires, especially in
noisy environments. If it is necessary to extend the wires, use twisted pair cable 22 to
14 AWG, rated for 300 V or 600 V (not less than the service voltage) and shielded if
possible
Make sure the CTs face the correct direction. An arrow might indicate either the load
or the source (public grid)
If you see strange readings on unused phases, jumper the unused CT inputs: for each
unused CT, connect a short cable from the terminal marked with a white dot to the ter-
minal marked with a black dot.
Fronius Smart Meter
L1
L2
L3
240 Vac 120 Vac
240 Vac
240 Vac 120 Vac
208 Vac
Fronius Smart Meter
L1
L2
L3
Ground
N
Fuses or
Breaker ≤ 20 A
Phase L1
Phase L2
Phase L3
(Wild Leg)
Neutral
N
Fuses or
Breaker ≤ 20 A
Phase L1
Phase L2
(Ground)
Phase L3
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