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2
Description of Relay
2.12
Thermal Overload Protection (49
Settings
Operational status
Maximum Continuous Overload Current k factor (Imax/In)
τ
Time Constant
(
Thermal Warning Stage
Current Warning Stage
Events that can control signal contacts, trip contacts, or
LEDs
Trip Time Characteristic
Dropout Ratios
Θ
⁄
(
Θtrip
)
(approx.)
Θ
⁄
(
Θwarn
)
(approx.)
I/I warn (approx.)
Operating Tolerances (with default settings)
k times In
Trip time
Effect of Environmental Influences on Times and Tolerances
Supply power voltage
Ambient temperature
System frequency
Specifications for Thermal Overload Protection (49
Table 2.9
26
Θwarn
)
⁄
(
Θtrip
)
1 and 49
-
-
Active, inactive, or block
contacts; choice can be temporarily
-
changed using binary
signal inputs
0.10 to 4.00 (0.01 steps)
1.0 to 999.9 min (0.1 min. steps)
50 to 100% referred to trip temperature rise
0.10 to 4.00 times In (0.01 steps)
Change in operational status; pickup, dropout, trip, and reset
events, start of time delay before trip. All events are logged, as
are the amplitude of the ground current and the phase
difference at the time of a trip.
τ is a constant describing the thermal behavior of the
object (see Section 9.3.2 on page 108).
I
is the present measured load current.
load
I
is the previous measured load current.
preload
I
is the maximum allowed continuous overload current
max
(a setting, see Section 9.3.1 on page 108)
ln means "the natural logarithm of..."
0.99
0.99
0.99
±10% of characteristic value (for k× I
±10% of setting value or 2s, whichever is greater
≤ 1% if between 80% and 115% of nominal voltage
≤ 0.5% / 10 K if between
-
5°C and 40°C (23°F and 104°F)
≤ 1% if between 95% and 105% of nominal frequency
-
-
1 and 49
2)
7UT51 v3
2)
-
-
angle
)
n
PRIM-2330C
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