Siemens siprotec 7SJ63 - Thermal Overload Protection (49)

Technical Data
10-297SJ63 Manual
C53000-G1140-C120-1
10.10 Thermal Overload Protection (49)
Setting Ranges/
Resolutions
K-Factor per IEC 60255-8 0.10 to 4.00 (Increments 0.01)
Time Constant τ 1.0 min to 999.9 min (Increments 0.1 min)
Thermal Alarm Θ
Alarm
/Θ
Trip
50% to 100% of the trip temperature rise
(Θ ALARM) (Increments 1%)
Current Overload I
Alarm
0.50 A to 20.00 A
1
) (Increments 0.05 A)
1
)
Alarm (I ALARM)
Extension K-Factor k
t
- Factor 1.0 to 10.0 relative to the time constant
when Machine Stopped for the machine running(Increments 0.1)
Emergency Time 10 s to 15000 s (Increments 1 s)
Trip Characteristic
Curve
See also Figure 10-6
Dropout Relations Θ/Θ
trip
Drops out with Θ
Alarm
Θ/Θ
Alarm
approx. 0.99
I/I
Alarm
approx. 0.97
Tolerances Referring to k · I
N
2 % or 50 mA
1
); 2 % class per IEC 60 255–8
Thermal trip and alarm times 3 % or 1 s for I/(k ·I
N
) > 1.25;
3 % class per IEC 60 255–8
Influencing Vari-
ables Referring to
[k · I
N
]
Power supply DC voltage (V
DC
) in range
0.8 ≤ V
PS
/ V
PS nominal
≤ 1.15 1 %
Temperature in range
23 °F≤ ϑ
amb
≤ 131 °F 0.3% /10º F
Frequency in range
0.95 ≤ f/f
N
≤ 1.05 1 %
1
) For I
N
= 1 A, divide all limits and increments by 5.
t τ
I
k I
N
⋅
-------------


2
I
pre
k I
N
⋅
-------------


2
–
I
k I
N
⋅
-------------


2
1
–
-------------------------------------------------
ln ⋅
=
Trip Characteristic Curve
t trip time in minutes
τ Temperature rise time constant
I Load current
I
pre
Pre-load current
k Setting factor per VDE 0435
Part 3011 and IEC 60255–8,
(see also Figure 10-6)
I
N
Nominal current of the device
Where:
for (I/ k
· I
N
) ≤ 8
[min]
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