11.4.10 Setting to Use an External Encoder for Speed Feedback
For fully-closed loop control, you normally set a parameter to specify using the motor
encoder speed (Pn22A = n.0).
If you will use a Direct Drive Servomotor and a high-resolution external encoder, set the
parameter to specify using the speed of the external encoder (Pn22A = n.1).
Parameter Meaning When Enabled Classification
Pn22A
n.0
(default
setting)
Use motor encoder
speed.
After restart Setup
n.1
Use external encoder
speed.
This parameter cannot be used if Pn002 is set to n.0
(Do not use
external encoder).
11.5 Monitoring an External Encoder
11.5.1 Overview
You can monitor the current value of an external encoder attached to a machine without
creating a fully-closed loop.
A dual encoder system with an encoder in the Rotary Servomotor and an external
encoder attached to the machine is used, but only the encoder in the Rotary Servomotor
is used in the control loop.
The external encoder is used only to monitor the current position of the machine. You can
also use a touch probe to latch the current position of an external encoder.
11.5.2 Option Module Required for Monitoring
A Fully-closed Module (SGDV-OFA01A) is required to use this function.
Refer to the following manual for detailed information on installation.
& Σ-V-Series/Σ-V-Series for Large-Capacity Models/Σ-7-Series Installation Guide Fully-
closed Module (Manual No.: TOBP C720829 03)
You cannot use a Safety Module (SGDV-OSA01A) if you install a Fully-
closed Module.
11.5.3 Related Parameters
The parameter that is used to monitor the external encoder as the current value of the
machine is given below.
Sigma-7 Series SERVOPACKs
Fully-Closed Loop Control
Monitoring an External Encoder > Related Parameters
| | PROFINET Communications - SIEP YEUOC7P 02A Revision 0 | en | 463
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