Siemens SIMOCODE pro System Manual page 435

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
Main circuit
L1 L2 L3
M
3~
Primary current at
nominal load: 205 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.
SIMOCODE pro
GWA 4NEB 631 6050-22 DS 03
to be parameterized in SIMOCODE pro is 0.5 A.
s
Secondary circuit
K1
K2
K3
L
3UF18 current transformer
Secondary current: 2 x 0.25 A
Mounting, wiring, interfaces
Double-looping through of the secondary cables
Current measuring
module 3UF 71
Adjustment range:
0.3 A - 3 A
Basic unit
3UF 70
Set current I : 0.5 A
s
13-35