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Section 4
1MAC050144-MB C
Protection functions
218
615 series ANSI
Technical Manual
The physical and dielectric insulations of the system deteriorate with age and the
deterioration is accelerated by the temperature increase. Insulation life is related to the
time interval during which the insulation is maintained at a given temperature.
An induction motor stalls when the load torque value exceeds the breakdown torque value,
causing the speed to decrease to zero or to some stable operating point well below the rated
speed. This occurs, for example, when the applied shaft load is suddenly increased and is
greater than the producing motor torque due to the bearing failures. This condition
develops a motor current almost equal to the value of the locked-rotor current.
51LR is designed to protect the motor in stall or mechanical jam situations during the
running state. To provide a good and reliable protection for motors in a stall situation, the
temperature effects on the motor have to be kept within the allowed limits.
4.1.12.6
Signals
Table 211: 51LR Input signals
Table 212: 51LR Output signals
4.1.12.7
Settings
Table 213: 51LR Non group settings
4.1.12.8
Monitored data
Table 214: 51LR Monitored data
Name
Type
Default
Description
I_A
SIGNAL
0
Phase A current
I_B
SIGNAL
0
Phase B current
I_C
SIGNAL
0
Phase C current
BLOCK
BOOLEAN
0=False
Block signal for activating the blocking mode
Name
Type
Description
TRIP
BOOLEAN
Trip
Parameter
Values (Range) Unit Step
Default
Description
Operation
1=Enable
5=Disable
1=Enable
Operation Disable / Enable
Pickup value
0.10...10.00
xln
0,01
2.50
Pickup value
Trip delay time
100...120000
ms
10
2000
Trip delay time
Reset delay time
0...60000
ms
1
100
Reset delay time
Name
Type
Values (Range)
Unit Description
PICKUP
BOOLEA
N
0=False
1=True
Pickup
PICKUP_DUR
FLOAT32
0.00...100.00
%
Ratio of pickup time / trip time
51LR
Enum
1=enabled
2=blocked
3=test
4=test/blocked
5=disabled
Status
Содержание 615 Series ANSI
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Страница 29: ...1MAC050144 MB C Section 615 series ANSI 22 Technical Manual ...
Страница 389: ...Section 4 1MAC050144 MB C Protection functions 382 615 series ANSI Technical Manual ...
Страница 485: ...Section 6 1MAC050144 MB C Supervision functions 478 615 series ANSI Technical Manual ...
Страница 635: ...Section 10 1MAC050144 MB C Other functions 628 615 series ANSI Technical Manual ...
Страница 707: ...Section 15 1MAC050144 MB C Applicable standards and regulations 700 615 series ANSI Technical Manual ...
Страница 711: ...Section 16 1MAC050144 MB C Glossary 704 615 series ANSI Technical Manual ...
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