You are here: Technical Support > Technical FAQs > How do I perform encoder based speed ratioing?

How do I perform encoder based speed ratioing?

At present the PL/X is equipped with only one set of encoder inputs, so it is not possible to ratio a PL/X in encoder feedback to another encoder. It is however possible to ratio a PL/X in encoder feedback to another PL/X in encoder feedback via a speed demand transmitted through the serial link when in REFERENCE EXCHANGE mode. The technique is as follows:

1) Master drive.
Go to CONFIGURATION, ENABLE GOTO,GETFROM and set to ENABLED. Go to SERIAL LINKS, RS232 PORT1, 188)PORT1 FUNCTION and set to REF EXCH MASTER.
Go to SERIAL LINKS, RS232 PORT1, REFERENCE EXCHANGE and set its GET FROM to 709)MOTOR RPM %
Go to CONFIGURATION, ENABLE GOTO,GETFROM and set to DISABLED.

2) Slave drive.
Go to CONFIGURATION, ENABLE GOTO,GETFROM and set to ENABLED.
Go to SERIAL LINKS, RS232 PORT1, 188)PORT1 FUNCTION and set to REF EXCH SLAVE.
Go to CONFIGURATION, BLOCK OP CONFIG, REF EXCH SLAVE GOTO and set it to 331)UIP3 IP OFFSET.
Go to CONFIGURATION, ENABLE GOTO,GETFROM and set to DISABLED.

It is now possible to set the master/slave speed ratio by going to CHANGE PARAMETERS, SPEED REF SUMMER and setting 67)SPD/CUR RF3 RATIO as desired. It is also possible to change the sign of the speed demand in CHANGE PARAMETERS, SPEED REF SUMMER, 66)SPD/CUR REF3 SIGN. Further scaling and limiting are possible using 332)UIP3 CAL RATIO, 333)UIP3 MAX CLAMP and 334)UIP3 MIN CLAMP in CONFIGURATION, UNIVERSAL INPUTS, UIP3 (T3) SETUP if needed.

Support

Brochures & Guides

Manuals

Datasheets

Software

FAQs

Glossary

DC Drive Replacement Finder

Digital DC Drive Feature Comparison Guide

Size Comparison Guide

Replacing Obsolete 1ph DC Drives