Omron VARISPEED L7 Manual page 87

Problem
Jerk caused by over-
shooting when the
top speed is reached
4
Motor stops shortly
when the leveling
speed is reached
(undershooting)
Jerk at stop
High frequency
motor noise
Vibrations which
increase with the
speed
12
4-
Possible Reason
• Too fast torque compensation or slip com-
OLV
pensation
• Too soft or too hard ASR controller set-
tings
CLV
• Wrong motor data
• Too hard acceleration change.
Common
• Too low torque at low speed
V/f
• Too low torque at low speed
OLV
• Wrong motor data
• Slip overcompensation
• Wrong motor data
CLV
• Too slow ASR controller
• Too fast deceleration rate change.
Common
• Brake closed too early, so that the motor
runs against the brake
Common
• Motor contactor opens when the brake is
not yet completely closed
• The carrier frequency is too low.
Common
• Encoder vibrates
CLV
• Mechanical problems
Common
• Rotational parts (motor armature, hand-
wheel, brake disk/drum) have an unbalance
Countermeasure
• Increase the torque compensation
delay time C4-02
• Increase the slip compensation delay
time C3-02
• Readjust the ASR P gain C5-01 and
the ASR integral time C5-02.
• Readjust the motor data (E2-
especially the slip (E2-02) and no-
load current values (E2-03) or per-
form an autotuning
• Increase the S-curve at acceleration
end C2-02.
• 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.
• 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.
• Readjust the motor data (E2-
especially the slip (E2-02) and no-
load current values (E2-03) or per-
form an autotuning
• Readjust the motor data (E2-
especially the slip (E2-02) and no-
load current values (E2-03) or per-
form an autotuning
• Increase the ASR P gain C5-09 and
decrease the ASR integral time
C5-10
• Increase the S-curve at deceleration
end C2-04.
• Increase the brake close delay time
S1-07 and if necessary the DC injec-
tion time at stop S1-05.
• Check the motor contactor sequence.
• Increase the carrier frequency in
parameter C6-02 or C6-11. If the car-
rier frequency increased higher than
the factory setting, a current derating
must be considered (refer to
6, Carrier Frequency Derating)
• Check the encoder mounting and the
orientation to the motor shaft
• Check bearings, gearbox
• Balance the rotating parts
),
),
),
page 9-