Omron VARISPEED L7

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4-11

Performance Optimization

The following table gives adjustment advice for performance improvement after the basic setup has been

done.

Table 4.3 Performance Optimization

Problem Possible Reason Countermeasure

Rollback at start

V/f and

OLV

• Too less torque when the brake opens

• Increase the DC injection current at

start in parameter S1-02.

• Set the DC injection time at start S1-

04 as short as possible, but make

sure, that brake opens completely

before the motor starts to turn.

• Increase the minmum (E1-10) and

medium (E1-08) V/f pattern voltages.

Make sure, that the starting and level-

ing current does not rise too high.

CLV

• Too slow ASR response when the brake

opens.

• Increase the ASR gain at start (C5-

03) and decrease the ASR I time at

start (C5-04). If vibrations occur set

the values back in small steps.

• Increase the Zero servo gain in

parameter S1-20.

Common

• Motor torque is not fully established when

the brake opens.

• Lengthen the brake release delay

time S1-06 and the DC injection/

zero servo time at start S1-04

• Motor contactors close too late

• Make sure, that the contactors are

cosed before the Up/Down com-

mand is set.

Jerk at start

Common

• Motor starts turning when the brake is not

completely opened or runs against the

brake

• Increase the DC injection time at start

S1-04.

• Too fast acceleration rate change • Increase the S-Curve at start C2-01

Vibrations in low

and medium speed

area

V/f

• Too high output voltage

• Reduce the V/f pattern settings (E1-

08 / E1-10)

OLV

• Too fast torque compensation

• Increase the torque compesation

delay time (C4-02)

• Too high output voltage

• Reduce the V/f pattern settings (E1-

08 / E1-10)

CLV

• Too high ASR settings

• Decrease C5-01 / C5-03 and increase

C5-02 / C5-04

• Wrong motor slip value

• Check the motor slip value in param-

eter E2-02. Increase or decrease it in

steps of 0.2 Hz.

Vibrations in the

high and top speed