Thermal Overload - Siemens SIPROTEC 7UT613 series Manual

4.9

Thermal Overload

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