Yaskawa FSP Amplifier - Manual (Page 145)

FSP Amplifier User’s Manual Chapter 5: Parameter Settings and Functions
5-78
5.7. Absolute Encoders
If a motor with an absolute encoder is used, a system to detect the absolute
position can be formed in the host controller. Consequently, automatic operation
can be performed without zero return operation immediately after the power is
turned ON.
Motor
SGM H- 1 ···With 16-bit absolute encoder
SGM H- 2 ···With 17-bit absolute encoder
WARNING
• When using the “Infinite Length Positioning System” be sure to take into
account the changes made in the continuous counting method when limits
are exceeded, as compared in the following table.
The output range of multi-turn data for the FSP Amplifier series absolute detection system
differs from the one used in conventional (Sigma) 12-bit and 15-bit encoder systems.
Absolute Encoder
Type
Output Range
of Multi-turn
Data
When the Output Range Exceeds the Limit:
(Sigma) conventional
type 12-bit and 15-bit
encoder
-99999 to
+99999
• When the upper limit (+99999) is exceeded in
positive direction, the counter displays 00000 and
begins counting up again.
• When the lower limit (-99999) is exceeded in
negative direction, the counter displays 00000 and
begins counting down again.
FSP Amplifier Series
16-bit and 17-bit
encoder
-32768 to
+32767
• When the upper limit (+32767) is exceeded in
positive direction, the counter changes polarity
(-32767) and begins counting up (toward zero and
beyond).
• When the lower limit (-32767) is exceeded in
negative direction, the counter changes polarity
(+32767) and begins counting down (toward zero
and beyond).
Note: After the limit has been changed in the multi-turn limit setting parameter (Pn205), the power must be cycled.
This generates a Multi-turn Limit Disagreement Alarm (A.CC). Make sure that the entered value is
appropriate before resetting this alarm. For more information see:
5.7.2 Configuring an Absolute Encoder ,
and 9.2.1 Troubleshooting Problems with Alarm Displays.