Bose MR-J2S- B instruction manual Absolute Position Detection System

13.ABSOLUTE POSITION DETECTION SYSTEM

13.ABSOLUTE POSITION DETECTION SYSTEM

CAUTION	If an absolute position erase alarm (25) has occurred, always perform home
	position setting again. Not doing so can cause runaway.

13.1 Features

For normal operation, as shown below, the encoder consists of a detector designed to detect a position within one revolution and a cumulative revolution counter designed to detect the number of revolutions. The absolute position detection system always detects the absolute position of the machine and keeps it battery-backed, independently of whether the servo system controller power is on or off.

Therefore, once home position return is made at the time of machine installation, home position return is not needed when power is switched on thereafter.

If a power failure or a fault occurs, restoration is easy.

Also, the absolute position data, which is battery-backed by the super capacitor in the encoder, can be retained within the specified period (cumulative revolution counter value retaining time) if the cable is unplugged or broken.

Servo system controller	Servo amplifier
	Position data
Current
position
Home position data
LS0
CYC0	Battery MR-BAT

Servo motor

1 pulse/rev accumulative revolution counter Super capacitor

Within one-revolution counter

the number	position within	Positioncontrol speedcontrol
Detecting	Detecting the
of revolutions	one revolution

High speed serial communication

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