B&C Technologies SA Series Industrial - Manual (Page 66)

TROUBLE SHOOTING
7-6
4. If the speed variation and current vibration (such as hunting) occur at the regular speed.
Possible Causes What to Check and Suggested Measures
1. The frequency command
fluctuated.
Check the signals for the frequency command with Menu #4 “I/O
checking” using the keypad.
→ Increase the filter constants (C33 and C38) for the frequency
command.
2. The external frequency
command device was
used.
Check that there is no noise in the control signal wires from
external sources.
→ Isolate the control signal wires from the main circuit wires as
far as possible.
→ Use shielded or twisted wires for the control signal.
3. The slip compensation
gain was too large.
Check that the motor vibration is absorbed if the slip compensation
(P09) is cancelled.
→ Correct or cancel the slip compensation (P09) data.
4. The vibration system
having low stiffness in a
load caused hunting or the
current is irregular due to
special motor constants.
Cancel the automatic control system (automatic torque boost, slip
compensation, energy saving operation, overload prevention
control, current limiting) and check that the motor vibration is
suppressed (F37, P09, H70, and F43).
→ Cancel the functions causing the vibration.
→ Readjust the data of the oscillation suppression gain (H80)
currently set.
Check that the motor vibration is suppressed if you decrease the
carrier frequency (F26) or set the sound tune to level 0 (F27=0).
→ Decrease the carrier frequency (F26) or set the sound tune
level 0 (F27=0).
5. If grating sound can be hard
Possible Causes What to Check and Suggested Measures
1. The carrier frequency was
set too low.
Check the data of function codes F26 and F27.
→ Increase the carrier frequency (F26).
→ Select the optimal value to the selection function (F27).
6. If grating sound can be hard
Possible Causes What to Check and Suggested Measures
1. The inverter ran the motor
by S – curve or curvilinear
pattern.
Check the data of function code H07.
→ Select the linear pattern.
2. The current limiting
prevented the output
frequency from increasing.
Check that current limiting is enabled with Menu #3 “Drive
monitoring” and check the current limiting level (F44) using the
keypad.
→ Change the current limiting level (F44) to a correct value.
→ Increase the acceleration and deceleration time (F07, F08,
E10, and E11).