Technical Data
10-29
7SJ63 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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