SEW-Eurodrive MFE Series - Connecting the Incremental Encoder EI7

6
Electrical installation
Connecting the incremental encoder EI7.
Manual – EtherCAT
®
Interfaces, Field Distributors
59
6.8 Connecting the incremental encoder EI7.
6.8.1 Area of application
With the MFE72A EtherCAT
®
interface and the built-in EI7 encoder from
SEW‑EURODRIVE, you can implement simple positioning based on a higher-level
controller. Just connect the built-in EI7 encoder to the MFE72A EtherCAT interface
and evaluate the position with a 32-bit counter. This design allows non-dynamic posi-
tioning with an accuracy of approx. ¼ of a motor rotation when using the EI7C en-
coder. However, direct position control or time-critical positioning is not supported.
With this design, you can replace applications that were previously implemented with
a rapid traverse/creep switch with initiator evaluation. Variable evaluation of any actual
position and specification of different speeds and acceleration ramps gives you
greater flexibility.
When in 10-PD mode (see "chapter "Process data object configuration"" (→ 2 71)),
the counter and thereby the current actual position is sent to the higher-level controller
and evaluated.
6.8.2 Features
The EI7. incremental encoder offers the following features:
• HTL interface
EI71: 1 pulse/revolution => 4 increments/revolution
1)
EI72: 2 pulses/revolution => 8 increments/revolution
1)
EI76: 6 pulses/revolution => 24 increments/revolution
1)
EI7C: 24 pulses/revolution => 96 increments/revolution
1)
1) due to 4-fold evaluation
6.8.3 Technical data of encoders
Technical data of encoders
Encoder signals (2tracks) Tracks A and B
Phase sequence 90°±20°
Pulse duty factor 1:1 ± 20%
Max. pulse frequency 120kHz
Connection trackA Terminal X20/19 (DI0)
or M12 plug connector (DI0)
Connection trackB Terminal X20/22 (DI1)
or M12 plug connector (DI1)
Reference potential GND on PE potential
The counter counts up for advancing A track and down for advancing B track.
25809148/EN – 01/2019