Bonfiglioli Vectron EM-RES-01 Expansion Module Rotary Transformer Interface Configuration Guide

If 235 is a positive value, increase Offset.

If 235 is a negative value, reduce Offset.

Repeat the adjustment until 235 approaches 0 (ideal target).

Recheck and fine tune Offset at 50% rated frequency.

Engineering tip: If there is no significant change in the value of 235 during the adjustment of Offset, it indicates that the step size is too small and should be increased (such as 10 °) and tried again. The maximum effective adjustment range of Offset is 360 °/(number of motor poles/number of rotating transformer poles).

4.6 Offset setting completed

After setting the offset:

Restore parameter 417 (Switch Off Limit) to the normal operating frequency limit.

Restore parameter 728 (Current Limit) to its rated value.

Perform SETUP guided debugging (allowing the frequency converter to automatically optimize the current loop parameters).

Please note: SETUP will reset some parameters, and after completion, it is necessary to confirm again whether Offset remains at the set value.

Analog input configuration

EM-RES-01 retains the same analog input functionality as the EM-IO series (EM-S1INA, located in X410B. 4):

Voltage/current switching: selected through dip switch S3

S3=OFF (downward): ± 10V voltage input

S3=ON (up): ± 20mA current input

Resolution: 12 bits

Characteristic curve: Set the two-point linear characteristic through parameters 564-567

Operation mode: Parameter 562 selects bipolar/unipolar/absolute value mode

Tolerance band: Parameter 560 (0%~25%, factory 2%) is used for zero crossing anti shake

Filtering: Parameter 561 selects a time constant of 0-5000ms

Analog input can be used as a frequency reference source, percentage reference source, or limit source.

Engineering application of repetitive frequency output

The repetition frequency output (EM-RFOUT) of EM-RES-01 converts the speed signal of the rotary transformer into an incremental encoder signal (A+/A -/B+/B -), which has the following engineering value:

PLC speed monitoring: The actual motor speed can be fed back to the PLC high-speed counting module without the need for an additional encoder

Master slave synchronization: serving as a speed reference source for the slave frequency converter

Diagnostic tool: Monitor the quality of the Resolver signal during debugging

Technical Specifications:

The division mark is fixed at 1024

Maximum output frequency 512kHz

TTL/RS-422 level, can be directly connected to standard differential encoder receiving equipment