Mechanical Vibration; Motor Rotates After Output Of Inverter Is Turned Off; Detects Ov When Motor Starts And Motor Stalls - Omron SYSDRIVE 3G3JVS ERIES User Manual

Maintenance Operations

7-2-9 Mechanical Vibration

H Mechanical system makes unusual noise.
• Resonance between the characteristic frequency of the mechanical system and the carrier frequency.
There may be resonance between the characteristic frequency of the mechanical system and the
carrier frequency. If the motor is running with no problems and the machinery system is vibrating
with a high-pitched whine, it may indicate that this is occurring. To prevent this type of resonance,
adjust the carrier frequency value in n46.
• Resonance between the characteristic frequency of a machine and the output frequency of the
Inverter.
There may be resonance between the characteristic frequency of a machine and the output fre-
quency of the Inverter. To prevent this from occurring, use the frequency jump function with the
constants set in n49 through n51 to change the output frequency or install vibration-proof rubber on
the motor base to prevent the resonance of the mechanical system.
H Vibration and hunting are occurring.
• Influence by the slip compensation function.
The slip compensation function of the Inverter may influence the characteristic frequency of the me-
chanical system to cause vibration or hunting. In that case, increase the time constant in n67 for slip
compensation. The larger this time constant is, however, the slower the response speed of the slip
compensation function will be.
H Motor vibrates excessively and does not rotate normally.
• Motor Phase Interruption
If one or two of the three phases of the motor are open, the motor will vibrate excessively and will not
rotate. Check that the motor is wired correctly without any disconnection. The same phenomenon
will occur if the output transistor of the Inverter is open and damaged. Check the balance of the In-
verter's output voltage as well.

7-2-10 Motor Rotates after Output of Inverter is Turned Off

• Insufficient DC Control
If the motor continues operating at low speed, without completely stopping, and after a deceleration
stop has been executed, it means that the DC braking is not decelerating enough.
In such cases, adjust the DC control as described below.
S Increase the parameter in n52 for DC control current.
S Increase the parameter in n53 for interruption DC control time.

7-2-11 Detects OV when Motor Starts and Motor Stalls

• Insufficient DC control at startup
Generation of OV and stalling can occur if the motor is turning when it is started.
This can be prevented by slowing the rotation of the motor by DC braking before starting the motor.
Increase the parameter in n54 for startup DC control time.
7-12
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
Chapter 7