Troubleshooting
7-35
îš„The frequency reference upper limit has been reached.
The output frequency upper limit is determined by the following formula:
Maximum Output Frequency (E1-04) × Frequency Reference Upper Limit (d2-01) / 100
Check to be sure that the constant E1-04 and d2-01 settings are suitable.
îš‹ Acoustic Noise From the Motor
The carrier frequency is automatically reduced if a current exceeding 110% of the Inverter rated current flows
while the Inverter output frequency is low. When the carrier frequency is reduced, acoustic noise form the
motor will change.
If acoustic noise from the motor causes a problem, change L8-38 (Carrier frequency reduction selection) to 0
(Disabled). However, for mechanical loads that require repetitive high torque, such as with cranes, leave L8-
38 to 1 (Enabled) without changing.
Acoustic noise from the motor can be changed by changing the setting of L8-39 (Reduced carrier frequency).
(The minimum set value is 1.0 kHz for open-loop vector control.)
To Next Page
Loading...
Need help?
General