Siemens 3RK1308‑0 00‑0CP0 Series Equipment Manual page 68

Functions
6.3 Basic function/basic parameter
Current motor current
The latest current in the motor starter is returned via the process image for analysis. In
addition, you can read out the latest current with phase precision in data set 94.
The current is measured in two phases. The current for the third phase is calculated. The
highest of the three values is determined. The returned 6-bit value specifies the motor
current ratio I
The value is represented by one digit before the decimal point (DI 1.5) and five digits after
the point (DI 1.0 to DI 1.4). This results in a maximum ratio for I
(approx. 197 %).
The resolution is 1/32 per bit (3.125 %).
DI 1.5 DI 1.4
2 2
0 -1
1 0.5
0 0
1 0
1 0
1 1
I
curr
I
rated
Default setting
● In the ET 200SP motor starter, the rated operational current is preset at the factory to the
maximum value. In the event of renewed parameterization, the parameters last set apply.
● Due to the engineering systems, the rated operational current is preset to the minimum
value for safety reasons. You must therefore parameterize this value when you configure
the system. The ET 200SP motor starter may otherwise trip due to overload on first
starting.
Settings
Table 6- 1 Settings for actual motor current
Device parameters
Rated operational
current
The setting range depends on the device type.
68
/ I (I
curr rated rated
DI 1.3 DI 1.2
2 2
-2 -3
0.25 0.125
0 0
0 0
1 1
1 1
= rated operational current I
= rated current of the motor
Default settings
In the motor starter: maximum value or last
•
parameterization
In engineering systems: minimum value
•
= parameterized rated operational current).
DI 1.1
2
-4
0.0625
0
0
0
1
x value (DI 1.0 to DI 1.5)
rated
Setting range
•
•
•
•
•
Increment: 0.01 A
Equipment Manual, 11/2019, A5E34821005002A/RS-AC/003
/ I of 1.96875
curr rated
DI 1.0
2
-5
0.03125 Sum = 1.96875
0 I = 0
curr
0 I = I
curr rated
0 I = I
curr rated
1 I = I
curr rated
0.1 A ... 0.4 A
0.3 A ... 1 A
0.9 A ... 3 A
2.8 A ... 9 A
4 A ... 12 A
Motor starter (3RK1308‑0**00‑0CP0)
x 1
x 1.375
x 1.96875