Absolute Position Detection System - Mitsubishi FX3U-20SSC-H User Manual

FX -20SSC-H Positioning Block User's Manual
3U
2. Details of control
The operation with the torque limit is as follows.
Various operations
START command
Torque limit setting
Torque output setting
Stored torque limit
3. Precautions for control
• If the zero return torque limit value exceeds the torque limit setting, an error occurs.
• If the torque limit function causes the operation to stop, drop pulses remain in the deviation counter. After
the load torque is removed, the operation continues according to the remaining pulses.
7.6.4

Absolute position detection system

An absolute position detection system is available with 20SSC-H.
What is the absolute position detection system?
In the absolute position detection system, the current position is stored in the servo amplifiers battery backed
memory, and even if the work piece moves at power failure, the moving distance is added to the current
position with the absolute encoder and servo amplifier absolute position system. After power-ON, the
absolute position detection system does not require the zero return procedure.
1. Conditions to use the absolute position detection system
• Use servomotors with absolute position encoders.
• Place a backup battery to the servo amplifier.
• Enables the absolute position detection system in servo parameters.
2. Initial zero-point determination
Even with the absolute position detection system, the zero-point must be determined at least once after the
equipment is manufactured.
To determine the zero-point for the first time, perform zero return according to one of the following types
: data set type, DOG type or stopper type.
ON
OFF
*1 , *2
*1 , *2
0
*1 :
The torque limit setting or torque output setting becomes valid at the rising edge of the START
signal. If the torque output setting is "0," operation is made with the torque limit setting.
*2 : If the positioning parameter setting is changed, issue a positioning control parameter command
to validate the new setting.
→ For related parameters, control data and monitor data, refer to Section 7.9
7 Before Starting Positioning Operation
ON
OFF
300
100
300
→ For zero return operation, refer to Section 8.1
7.6 Other functions
OFF
200
100
1
2
3
4
5
6
7
8
9
10
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