Thermal Overload Protection 49 - Siemens SIPROTEC 7SJ61 Manual

Technical Data

4.12 Thermal Overload Protection 49

4.12 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
Power supply direct voltage in range 0.8 ≤ V
Temperature in range of 23.00 °F (–5 °C) ≤ Θ
Frequency in range f
Frequency out of Range f
344
0.10 to 4.00
1.0 min to 999.9 min
th
/Θ 50% to 100% of the trip excessive temperature Increments 1 %
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
1.0 to 10.0 relative to the time constant for the
machine running
10 s to 15000 s
Emergency
) 40 °C to 200 °C = –13 °F to +185 °F
Nom
Drops out with Θ
Approx. 0.99
Approx. 0.97
Nom
Nom
± 5 Hz
N
± 5 Hz
Nom
Alarm
2 % or 10 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
≤ 1.15
/V
PS PSNom
≤ 131.00 °F (55 °C)
amb
C53000-G1140-C210-1, Release date 02.2008
Increments 0.01
Increments 0.1 min
Increments 0.01 A
Increments 0.1
Increments 1 s
Increments 1 °C
= 1 A, or 50 mA for I = 5 A,
Nom
) > 1.25;
1 %
0.5 %/10 K
1 %
Increased Tolerances
SIPROTEC, 7SJ61, Manual