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5. OPERATION
5.8 Absolute position detection system
CAUTION
If an absolute position erase alarm (A25) or an absolute position counter warning
(AE3) has occurred, always perform home position setting again. Not doing so
may cause unexpected operation.
POINT
If the encoder cable is disconnected, absolute position data will be lost in the
following servo motor series. HF-MP, HF-KP, HC-SP, HC-RP, HC-UP, HC-
LP, and HA-LP. After disconnecting the encoder cable, always execute home
position setting and then positioning operation.
When the following parameters are changed, the home position is lost when
turning on the power after the change. Execute the home position return
again when turning on the power.
Parameter No.PA06 (Electronic gear numerator)
Parameter No.PA07 (Electronic gear denominator)
Parameter No.PA14 (Rotation direction selection)
Parameter No.PC07 (Home position return position data)
This servo amplifier contains a single-axis controller. Also, all servo motor encoders are compatible with an
absolute position detection system. Hence, an absolute position detection system can be configured up by
merely loading an absolute position data back-up battery and setting parameter values.
(1) Restrictions
An absolute position detection system cannot be built under the following conditions.
1) Stroke-less coordinate system, e.g. rotary shaft, infinite positioning.
2) Operation performed in incremental value command type positioning system.
(2) Specifications
Item Description
System Electronic battery backup system.
Battery
1 piece of lithium battery ( primary battery, nominal
3.6V)
Type: MR-J3BAT.
Maximum revolution range Home position 32767 rev.
(Note 1) Maximum speed at power failure 3000r/min
(Note 2) Battery backup time Approx. 10,000 hours (battery life with power off)
Battery storage period 5 years from date of manufacture.
Note 1. Maximum speed available when the shaft is rotated by external force at the time of power failure or the like.
2. Time to hold data by a battery with power off. It is recommended to replace the battery in three years
independently of whether power is kept on or off.