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Functions
6.19.3 Settings
Addr.
Setting Title
4201
Ther. OVERLOAD
4202
K-FACTOR
4203
TIME CONSTANT
Θ ALARM
4204
4205
I ALARM
4206
CALC. METHOD
6.19.4 Information Overview
F.No.
Alarm
1503
>BLK ThOverload
1511
Th.Overload OFF
1512
Th.Overload BLK
1513
Th.O/L ACTIVE
1515
Th.O/L I Alarm
Th.O/L Θ Alarm
1516
1517
Th.O/L Pickup
1521
Th.O/L TRIP
6-268
Since an overload usually occurs in a balanced way, this setting is of minor impor-
tance. If unbalanced overloads are to be expected, however, these options lead to dif-
ferent results.
Averaging should only be used if a rapid thermal equilibrium is possible in the protect-
ed object, e.g. with belted cables. If the three phases are, however, more or less ther-
mally isolated (e.g. single conductor cables or overhead lines), one of the maximum
settings should be chosen at any rate.
Note: The indicated secondary current for setting ranges and default settings refer to
I
= 1 A. For the nominal current 5 A the current values are to be multiplied by 5.
N
Setting Options
OFF
ON
Alarm Only
0.10..4.00
1.0..999.9 min
50..100 %
0.10..4.00 A
Theta Max
Average Theta
Theta from Imax
>BLOCK Thermal Overload Protection
Thermal Overload Protection OFF
Thermal Overload Protection BLOCKED
Thermal Overload Protection ACTIVE
Th. Overload: Current Alarm (I alarm)
Th. Overload Alarm: Near Thermal Trip
Th. Overload Pickup before trip
Th. Overload TRIP command
Default Setting
OFF
Thermal overload protection
1.10
K-Factor
100.0 min
Time constant
90 %
Thermal Alarm Stage
1.00 A
Current Overload Alarm setpoint
Theta Max
Method of Acquiring Tempera-
ture
Comments
Comments
7SA6 Manual
C53000-G1176-C156-2
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