IAI MSEL, Instruction Manual, Page: 100 / 234

Chapter 4 Home-Return /
Absolute Reset
92
4.4.4 Absolute Encoder Backup Type
Item Specification
Battery model AB-7
Number of Units 1 unit/axis (4 units/4 axes max.)
Battery Voltage 3.6V
Current Capacity 3300mAH
Reference for battery replacing timing
(Note 1)
Approx. 3 years (It may differ depending on
condition of use)
Note 1 Replace the battery regularly.
4.4.5 Charging Absolute Battery
Have the battery charged continuously for 72 hours or more for the first time to use or after
replacing the battery. While 24V is being supplied to a controller, battery is being charged.
Data Retaining Duration (Reference assuming a battery is new)
Setting in Each
Axis Parameter
No. 49
Upper Boundary for Number of
Encoder Rotation When Power is
off [rpm]
Reference for
Duration of
Battery
Remaining [days]
Retaining
Duration as of 1
Hour of Battery
Charging
(Reference) [hrs]
0 100 20 6.6
1 200 15 5.0
2 (factory default) 400 10 3.3
3 800 5 1.6
The data will be lost if the controller is off for more than the capable duration to retain the data.
Charge the battery as early as possible.
A battery has its life, and the capable duration to retain data decreases gradually. Replace the
battery if the retaining duration is remarkably dropped even after charging it properly.
e.g.) Conditions of Use;
Monday to Friday = Charged for 8 hours per day, discharged for 16 hours
Saturday and Sunday = Discharge
1) If setting is Parameter No. 19 = 3;
Total Charging: Operation time 8 [hrs] per day * Retaining time 1.6 [hrs] per hour of
charging * Weekdays 5 [days] = 64 [hrs]
Total Discharging: Stopped time during night 16 [hrs] * Weekdays 5 [days] + Stopped time
in weekend 48 [hours] = 128 [hrs]
Assuming to start on Monday with the battery fully charged, the total discharging exceeds
the total charging by 64 [hrs], thus the amount of fully charged keeps decreasing by 64
[hrs].
2) If setting is Parameter No. 19 = 2;
Total Charging: Operation time 8 [hrs] per day * Retaining time 3.3 [hrs] per hour of
charging * Weekdays 5 [days] = 132 [hrs]
Total Discharging: Stopped time during night 16 [hrs] * Weekdays 5 [days] + Stopped time
in weekend 48 [hours] = 128 [hrs]
Assuming to start on Monday, the total charging exceeds the total discharging, thus there
is no need of continuous full charging. The battery is charged for 4 hours in one week.