Absolute Position Back-Up - JVL MIS17 Series User Manual

5.4
5.4.1 Position back-up
This feature is specifically ment to be used when the motor is equipped with a H2 en-
coder and is ment to be a "low cost" solution compared to having the H3 or H4 encoder
which is a full featured absolute multiturn encoder that takes care of keeping the motor
position intact regardless if the motor is powered or not.
5.4.2 Functional description
The position backup feature makes it possible to save the last position before power was
removed (the power supply at the CVI terminal). If the motor has not been moved more
that half a revolution in either direction during power down.
An hardware improvement have been made on newer motors having a serial number (la-
bel at motor will tell) >SN173000. Before and after serial number 173000 the MIS motor
therefor have a different functionality. Motors with a serial number >SN173000 auto-
matically saves the position every 1 second.
5.4.3 Setup position backup using MacTalk
TT2395-02GB
The available options when using the absolute position backup feature is available in Mac-
Talk as shown above.
The parameters available and their function are as follows:
Acceptance Count
Acceptance Voltage
Save Voltage
Value of P_IST after power up
P_IST=0
Absolute Single turn Encoder
Absolute Multiturn Encoder
108 JVL Industri Elektronik A/S - User Manual - Integrated Stepper Motors MIS17x, 23x, 34x, 43x

Absolute position back-up

Only MISxxx---H2---
Acceptance count Register 140
Acceptance voltage Register 139
Save threshold voltage reg. 141
SetupRegister Register 124
Only valid if H2 encoder is present
Valid for H2, H3 or H4 encoder
option. If no encoder option is
present the position data stored
by the backup system will be used.