Functions
6-268 7SA6 Manual
C53000-G1176-C156-2
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.
6.19.3 Settings
Note: The indicated secondary current for setting ranges and default settings refer to
I
N
=1A.Forthenominalcurrent5Athecurrentvaluesaretobemultipliedby5.
6.19.4 Information Overview
Addr. Setting Title Setting Options Default Setting Comments
4201 Ther. OVERLOAD OFF
ON
Alarm Only
OFF Thermal overload protection
4202 K-FACTOR 0.10..4.00 1.10 K-Factor
4203 TIME CONSTANT 1.0..999.9 min 100.0 min Time constant
4204 Θ ALARM 50..100 % 90 % Thermal Alarm Stage
4205 I ALARM 0.10..4.00 A 1.00 A Current Overload Alarm setpoint
4206 CALC. METHOD Theta Max
Average Theta
Theta from Imax
Theta Max Method of Acquiring Tempera-
ture
F.No. Alarm Comments
1503 >BLK ThOverload >BLOCK Thermal Overload Protection
1511 Th.Overload OFF Thermal Overload Protection OFF
1512 Th.Overload BLK Thermal Overload Protection BLOCKED
1513 Th.O/L ACTIVE Thermal Overload Protection ACTIVE
1515 Th.O/L I Alarm Th. Overload: Current Alarm (I alarm)
1516 Th.O/L Θ Alarm Th. Overload Alarm: Near Thermal Trip
1517 Th.O/L Pickup Th. Overload Pickup before trip
1521 Th.O/L TRIP Th. Overload TRIP command
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