APPLICATIONS OF Σ-SERIES PRODUCTS
3.8.5 Using an Absolute Encodercont.
150
Use the following user constant to set the number of pulses for the absolute en-
coder to be used:
Cn-11
PULSNO
Number of Encoder
Pulses
Unit:
P/R
Setting
Range:
Number of
Encoder
Pulses
Factory
Setting:
2048
For Speed/Torque
Control and Position
Control
Sets the number of encoder pulses according to the servomotor type to be used.
Motor Type Number of Encoder Pulses Per Revolution
Preset
Value
SGM-jjj31j
SGMP-jjj31j
Incremental encoder: 2048 pulses per revolution 2048
SGM-jjjW1j
SGMP-jjjW1j
Absolute encoder: 1024 pulses per revolution
1024
5) Using a Battery
Use the following battery to enable the absolute encoder to store position information
even when the power is turned OFF. Load the battery in the host controller and connect it
to Servopack input terminals BAT and BAT0.
Recommended battery:
D Connect the battery securely to prevent contact faults
resulting from environmental changes or aging.
Lithium battery
Toshiba Battery ER6V C3 Type
3.6 V, 2000 mAH
D Battery voltage is not monitored inside the Servopack.
Provide a battery voltage monitor circuit as necessary.
Minimum voltage: 2.8 V
6) Setting up Absolute Encoder
a) Set up the absolute encoder in the following cases:
• When starting the machine for the first time
• When the absolute encoder is not connected to power supply or backup power supply
(battery) for more than two days
3
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