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JVL Industri Elektronik A/S - User Manual - Integrated Stepper Motors MIS23x, 34x, 43x
87
5.5.5
Position retention time
A special high temperature "Poly-carbon mono fluoride" lithium cell is used as backup for
the absolute multi-turn encoder. Compared to standard cells this one has extremely
good performance at high temperatures up to 125 degrees Celsius.
Normal lithium cells self-discharge very rapidly just being exposed to a temperature of
60 degree celsius.
The retention time of the position when the motor is not supplied is better than
10
years
. This depends of how long time the motor is in use and the temperature.
The self-discharge at 85 degrees celsius (185 degrees Fahrenheit) is 6% per year, and
2% per year at 40 degrees celsius (104 degrees Fahrenheit).
Concerning the retention time, there is no big difference if the motor is in use at a high
temperature or it is powered down (low temperature).
The absolute multi-turn encoder's current consumption from the battery when the mo-
tor is not externally powered, is max. 1.5µA.
The curves below shows what is considered as a worst case scenario for the retention
time. The curves are based on 40 and 85 degree celsius (108/185F)
without any exter-
nal power applied to the motor
meaning that the internal battery have to supply cur-
rent to the encoder circuitry all the time. The current consumption of the encoder
circuitry is however not dominant compared to the internal leakage current in the bat-
tery.
Hints to optimise the battery lifetime:
1.
Avoid to place the motor in an environment with high temperatures.
2. Set the running and especially the standby motor current as low as possible in order
not to heat up the motor unnecessarily.
3. Keep the external power applied as much as possible.
Only MISxxx---
H3
--
0
20
40
60
80
100
120
0
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16 17 18 19 20
Batt
Batt
Batt. level (%)
Battery life time as function of temperature
Years
Battery level when temp. = 40deg.(108F)
Battery level when temp. = 85deg.(185F)
Содержание MIS23 Series
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Страница 59: ...JVL Industri Elektronik A S User Manual Integrated Stepper Motors MIS23x 34x 43x 57 4 Using MacTalk ...
Страница 71: ...JVL Industri Elektronik A S User Manual Integrated Stepper Motors MIS23x 34x 43x 69 5 Description of functions ...
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Страница 117: ...JVL Industri Elektronik A S User Manual Integrated Stepper Motors MIS23x 34x 43x 115 8 Registers ...
Страница 188: ...186 JVL Industri Elektronik A S User Manual Integrated Stepper Motors MIS23x 34x 43x ...
Страница 189: ...JVL Industri Elektronik A S User Manual Integrated Stepper Motors MIS23x 34x 43x 187 9 Building Sequential Programs ...
Страница 260: ...258 JVL Industri Elektronik A S User Manual Integrated Stepper Motors MIS23x 34x 43x ...
Страница 261: ...JVL Industri Elektronik A S User Manual Integrated Stepper Motors MIS23x 34x 43x 259 11 Modbus interface ...
Страница 265: ...JVL Industri Elektronik A S User Manual Integrated Stepper Motors MIS23x 34x 43x 263 12 Stand alone electronics ...
Страница 278: ...276 JVL Industri Elektronik A S User Manual Integrated Stepper Motors MIS23x 34x 43x 13 Technical Data ...
Страница 288: ...286 JVL Industri Elektronik A S User Manual Integrated Stepper Motors MIS23x 34x 43x 13 7 Trouble shooting guide ...
Страница 294: ...292 JVL Industri Elektronik A S User Manual Integrated Stepper Motors MIS23x 34x 43x 14 5 Connection to PLC PC Boards ...
Страница 296: ...294 JVL Industri Elektronik A S User Manual Integrated Stepper Motors MIS23x 34x 43x 15 1 Cables ...
Страница 301: ...JVL Industri Elektronik A S User Manual Integrated Stepper Motors MIS23x 34x 43x 299 16 Appendix ...
Страница 335: ...JVL Industri Elektronik A S User Manual Integrated Stepper Motors MIS23x 34x 43x 333 ...
Страница 336: ...334 JVL Industri Elektronik A S User Manual Integrated Stepper Motors MIS23x 34x 43x 17 Declarations ...
Страница 341: ...JVL Industri Elektronik A S User Manual Integrated Stepper Motors MIS23x 34x 43x 339 ...
Страница 342: ...340 JVL Industri Elektronik A S User Manual Integrated Stepper Motors MIS23x 34x 43x 17 4 Index ...