Siemens SIPROTEC 7UT613 series, Manual, Page: 465 / 638

4.9 Thermal Overload
465
7UT613/63x Manual
C53000-G1176-C160-2
4.9 Thermal Overload
Setting Ranges
Trip Curve
Dropout to Pickup Ratios
Tolerances
Factor k according to IEC 60255-8 0.10 to 4.00 Steps 0.01
Time constant
τ
1.0 min to 999.9 min Increments
0.1 min
Cooling down factor at motor
stand-still K
τ
-factor 1.0 to 10.0 Steps 0.1
Thermal alarm stage
Θ
Alarm
/
Θ
Trip
50% to 100% referred to
trip temperature rise Steps 1 %
Current alarm stage
I
Alarm
0.10 to 4.00 A
1)
Steps 0.01 A
Start-up recognition
I
motor startup
0.60 to 10.00 A
1)
or
∞
(no start-up recogni-
tion)
Steps 0.01 A
Emergency start run-on time T
Run-on
10 s to 15000 s Steps 1 s
1)
Secondary values based on
I
N
= 1 A; for
I
N
= 5 A the currents must be multiplied by 5.
Θ
/
Θ
OFF
Dropout with
Θ
Alarm
Θ
/
Θ
Alarm
approx. 0.99
I
/
I
Alarm
approx. 0.97
For one 3-phase measuring location
relating to k ·
I
N
3 % or 10 mA
1)
;
class 3% according to IEC 60255-8
Referring to tripping time 3 % or 1.2 s at f
N
= 50 / 60 Hz
5 % or 1.2 s at f
N
= 16.7 Hz
for
I
/(k·
I
N
) > 1.25
1)
Secondary values based on
I
N
= 1 A; for
I
N
= 5 A the currents must be multiplied by 5.