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78
Fig. 71
Nominal Motor Current (IMn):
Nominal Motor Temperature (TMn):
Time Constant Off:
Time Constant Normal:
Time Constant Overheat:
Warning Temperature (Twarn):
Trip Temperature (Ttrip):
Environment Temperature (Tenv):
Reset Temperature (Trst):
Initial Temperature (Tinit):
Parameter
Nominal Motor Current (IMn)
Nominal Motor Temperature (TMn)
Time Constant Off (I < 0.1 IMn)
Time Constant Normal
Time Constant Overheat (I>2IMn) 10...20000
Warning Temperature (Twarn)
Trip Temperature (Ttrip)
Environment Temperature (Tenv)
Reset Temperature (Trst)
Initial Temperature (Tini)
The threshold setting range is expressed in primary current Ampere [A], up to 20 IMn with IMn is the motor nominal
current, by default equal to In, the feeder Nominal Primary Current value entered in the General Settings.
Nominal Motor current for operational condition detection.
Nominal Motor Temperature, asymptotically reached at IMn
with environment temperature Tenv.
Time constant for cooling down.
Time constant for motor operational condition.
Time constant for overload condition.
Temperature threshold for warning condition.
Temperature threshold for trip condition.
Ambient temperature.
Initial (i.e. after reset by Configuration Tool) motor tempe-
rature.
Initial motor temperature at protection initializing.
Values
Default
0.5 – 1.2 p.u. di In 50
50 - 400
50
10...60000
10
10...20000
10
10
50...400
50
50...400
100
10...50
20
10...400
10
10...400
10
Step Unit
ExplanationType
1
A
Nominal Motor Current
1
°C
Operating Temp. at Tenv and IMn
1
s
Cooling constant
1
s
Working heating constant
1
s
Overheating constant
1
°C
Overtemperature alarm <Ttrip
1
°C
Overtemperature trip
1
°C
Ambient temperature <Tini
1
°C
Reset temperature <Tini
1
°C
Tenv < Tini < TMn
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