Mounting, wiring, interfaces
SIMOCODE pro
GWA 4NEB 631 6050-22 DS 03
13-35
Example 2:
• 3UF1868-3GA00 current transformer:
– Primary current: 205 A at nominal load
– Secondary current: 0.25 A
• SIMOCODE pro with 3UF7 100-1AA00-0 current measuring module,
Set current 0.3 to 3 A
This means:
– The secondary current of the current transformer is 0.25 A at the rated
load and is, therefore, not within the 0.3 A to 3 A setting range of the
current measuring module used.
– The secondary current must be boosted by multiple looping of the
secondary cables through the through-hole openings of the current
measuring module. Double-looping results in 2 x 0.25 A = 0.5 A.
– The set current I
s
to be parameterized in SIMOCODE pro is 0.5 A.
Fig. 13-22: Example (2 of 2) for measuring current with an 3UF18 external current transformer
Note
When using basic unit 2 (SIMOCODE pro V) from version *E03* onwards,
the set current does not have to be converted. It will correspond to the
rated current flowing on the main current side.
Additional entry of the transformation ratio of the current transformer
(interposing transformer) will result in automatic conversion in the device.
M
3~
L1 L2 L3
K1
K2
K3
L
Main circuit
3UF18 current transformer
Basic unit
3UF 70
Secondary circuit
Primary current at
nominal load: 205 A
Secondary current: 2 x 0.25 A Set current I
s
: 0.5 A
Current measuring
module 3UF 71
Adjustment range:
0.3 A - 3 A
Double-looping through of the secondary cables
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