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7.1.7
RTD Overload Biasing
The RTD biasing calculates a motor thermal value based on the highest stator RTD measurement. The motor thermal overload content is
set to this calculated value, if this calculated value is higher than the motor thermal overload content. The RTD biasing is calculated as
follows:
Max measured stator RTD temp < RTD Bias Min Level (RTD27)
BiasOL
%
=
0
RTD Bias Min Level (RTD27) < Max measured stator RTD temp < RTD Bias Mid Point Level (RTD28)
BiasOL
RTD
MinBiasTemp
MidBiasTemp
MinBiasTemp
%
max
=
-
-
´
Hot Cold Ratio
_
_
RTD Bias Mid Point Level (RTD28) < Max measured stator RTD temp < RTD Bias Max Level (RTD29)
BiasOL
RTD
MidBiasTemp
MaxBiasTemp
MidBiasTemp
%
max
=
-
-
´
(
. %
_
_
)
_
_
99 9
-
é
ë
ê
ù
û
ú +
hot cold ratio
hot cold ratio
RTD Bias Max Level (RTD29) < Max measured stator RTD temp
BiasOL
%
. %
=
99 9
The RTD Biasing levels are generally set by using the motor data as follows:
RTD Bias Min Level (RTD27): This parameter is typically programmed to the ambient temperature rating of the motor.
RTD Bias Mid Level (RTD28): This parameter is typically programmed to the temperature rise rating of the motor.
RTD Bias Max Level (RTD29): This parameter is typically programmed to insulation rating of the motor.
118
7 - THEORY OF OPERATION
10
0
20
30
40
50
60
70
80
90
100
0
50
50
100
150
200
250
Maximum RTD Temperature (C)
RTD
B
ias
V
alue
(%)
Hot/Cold Ratio
RTD BiasMin
RTD BiasMid
RTD BiasMax
RTD Bias Curve
Figure 30: RTD Bias Curve
Содержание RediStart EXEXMVRMX3 Series
Страница 2: ......
Страница 10: ......
Страница 11: ...1 Introduction 1...
Страница 17: ...2 Technical Specifications 7...
Страница 27: ...3 Installation 17...
Страница 38: ...EXMVRMX3 I O Card Layout 3 9 EXMVRMX3 I O Card Layout 28 3 INSTALLATION Figure 11 EXMVRMX3 I O Card Layout...
Страница 48: ......
Страница 49: ...4 Keypad Operation 39...
Страница 59: ...5 Parameter Groups 49...
Страница 67: ...6 Parameter Description 57...
Страница 122: ...NOTES 112 6 PARAMETER DESCRIPTION...
Страница 123: ...7 Theory of Operation 113...
Страница 155: ...NOTES 145 7 THEORY OF OPERATION...
Страница 156: ...146 7 THEORY OF OPERATION...
Страница 157: ...8 Troubleshooting Maintenance 147...
Страница 185: ...NOTES 175 8 TROUBLESHOOTING MAINTENANCE...
Страница 186: ......
Страница 187: ...Appendices 177...
Страница 213: ...203 APPENDIX H 3 YEAR WARRANTY...
Страница 221: ...Publication History Revision Date ECO 00 12 15 06 Initial Release...