Thermal Overload Protection - Siemens SIPROTEC 7SK80 Manual
Motor protection
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Also See for SIPROTEC 7SK80:
- Manual (512 pages) ,
- Product information (80 pages) ,
- Manual (43 pages)
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Technical Data
4.14 Thermal Overload Protection 49
4.14
Thermal Overload Protection 49
Setting Ranges / Increments
K-Factor per IEC 60255-8
Time Constant τ
Thermal Alarm Θ
Current Overload I
Extension kτ Factor when Machine
Stopped
Emergency Time T
Nominal Overtemperature (for I
Trip Characteristic
Dropout Ratios
Θ/Θ
Trip
Θ/Θ
Alarm
I/I
Alarm
Tolerances
Referring to k · I
Referring to trip time
Influencing Variables Referring to k · I
Auxiliary DC voltage in range
0,8 ≤ V
/V
Aux
AuxNom
Temperature in range –5 °C (41 °F) ≤ Θ
Frequency in range of 50 Hz to 70 Hz
Frequency in range 0.95 ≤ f/f
Frequency outside range 0.95 ≤ f/f
374
th
/Θ
Alarm
Trip
for I
= 1 A 0.10 A to 4.00 A
Alarm
Nom
for I
= 5 A 0.50 A to 20.00 A
Nom
Emergency
)
Nom
Drops out with Θ
Approx. 0.99
Approx. 0.97
Nom
Nom
≤ 1.15
amb
≤ 1.05
Nom
≤ 1.05
Nom
0.10 to 4.00
1.0 min to 999.9 min
50% to 100% of the trip excessive
temperature
1.0 to 10.0 relative to the time constant for
the machine running
10 s to 15000 s
40 °C to 200 °C = –13 °F to +185 °F
Alarm
3 % or 15 mA for I
Nom
2 % class according to IEC 60255-8
3 % or 1 s for I/(k ·I
Nom
3 % class according to IEC 60255-8
1 %
≤ 55 °C (131 °F)
0.5 %/10 K
1 %
Increased tolerances
E50417-G1140-C344-A4, Release date 08.2010
Increments 0.01
Increments 0.1 min
Increments 1 %
Increments 0.01 A
Increments 0.1
Increments 1 s
Increments 1 °C
= 1 A, or 75 mA for I
= 5 A,
Nom
) > 1.25;
SIPROTEC, 7SK80, Manual
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