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10.10 Thermal Overload Protection (49)
Setting Ranges/
Resolutions
Trip Characteristic
Curve
Dropout Relations
Tolerances
Influencing Vari-
ables Referring to
[k · I
]
N
7SJ63 Manual
C53000-G1140-C120-1
K-Factor per IEC 60255-8
Time Constant
Thermal Alarm
(Θ ALARM)
Current Overload
Alarm (I ALARM)
Extension K-Factor
when Machine Stopped
Emergency Time
Trip Characteristic Curve
) ≤ 8
·
for (I/ k
I
N
Where:
Θ/Θ
trip
Θ/Θ
Alarm
I/I
Alarm
Referring to k · I
N
Thermal trip and alarm times
Power supply DC voltage (V
0.8 ≤ V
≤ 1.15
/ V
PS
PS nominal
Temperature in range
23 °F≤ ϑ
≤ 131 °F
amb
Frequency in range
0.95 ≤ f/f
≤ 1.05
N
1
) For I
= 1 A, divide all limits and increments by 5.
N
0.10 to 4.00
τ
1.0 min to 999.9 min (Increments 0.1 min)
Θ
/Θ
50% to 100% of the trip temperature rise
Alarm
Trip
I
0.50 A to 20.00 A
Alarm
k
- Factor
1.0 to 10.0 relative to the time constant
t
for the machine running(Increments 0.1)
10 s to 15000 s
See also Figure 10-6
τ
⋅
t
ln
=
t
trip time in minutes
τ
Temperature rise time constant
Load current
I
I
Pre-load current
pre
k
Setting factor per VDE 0435
Part 3011 and IEC 60255–8,
(see also Figure 10-6)
Nominal current of the device
I
N
Drops out with Θ
approx. 0.99
approx. 0.97
2 % or 50 mA
3 % or 1 s for I/(k ·I
3 % class per IEC 60 255–8
) in range
DC
1 %
0.3% /10º F
1 %
Technical Data
(Increments 0.01)
(Increments 1%)
1
) (Increments 0.05 A)
(Increments 1 s)
2
I
2
I
pre
------------ -
–
------------ -
⋅
⋅
k I
k I
N
N
------------------------------------------------ -
[min]
2
I
------------ -
–
1
⋅
k I
N
Alarm
1
); 2 % class per IEC 60 255–8
) > 1.25;
N
1
)
10-29
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