Troubleshooting
7
7.10 Troubleshooting Without Fault Display
SIEPYEUOQ2A01A AC Drive Q2A Technical Manual 301
◆ The Output Frequency Is Lower Than the Frequency Reference
Causes Possible Solutions
The frequency reference is in the Jump frequency range. Adjust d3-01, d3-02, d3-03, and d3-04 [Jump Frequency 1, Jump Frequency 2, Jump Frequency
3, and Jump Frequency Width] .
Note:
Enabling the Jump frequency prevents the drive from outputting the frequencies specified in
the Jump range.
The upper limit for the frequency reference has been exceeded. Set E1-04 [Max Output Frequency] and d2-01 [FRef Upper Limit] to the best values for the
application.
Note:
This calculation supplies the upper value for the output frequency:
E1-04 × d2-01 / 100
A large load triggered Stall Prevention function during acceleration. • Decrease the load.
• Adjust L3-02 [StallP Level@Accel].
L3-01 = 4 [StallP Mode@Accel = ILim Mode] has been set. 1. Check whether the V/f pattern and motor parameter settings are appropriate, and set them
correctly.
2. If this does not solve the problem, and it is not necessary to limit the current level of stall
during acceleration, adjust L3-02.
3. If this does not solve the problem, set L3-01 = 2 [General Purpose].
The motor is rotating at this speed:
b2-01 [ZSpd/DCI Threshold] ≤ Motor Speed < E1-09 [Min Output
Frequency]
• Set b1-21 = 2 [CLV Start Selection = Accept RUN].
• Set E1-09 < b2-01.
◆ The Motor Is Making an Audible Noise
Causes Possible Solutions
100% of the rated output current of the drive was exceeded while operating
at low speeds.
• If the sound is coming from the motor, set L8-38= 1[Carrier Reduction Mode = Enable<6
Hz].
• If oL2 [Drive Overloaded] occurs frequently after setting L8-38 = 1, replace the drive with a
high-capacity drive.
◆ The Motor Will Not Restart after a Loss of Power
Causes Possible Solutions
The drive did not receive a Run command after applying power. • Examine the sequence and wiring that enters the Run command.
• Set up a relay to make sure that the Run command stays enabled during a loss of power.
For applications that use 3-wire sequence, the momentary power loss
continued for a long time, and the relay that keeps the Run command has
been switched off.
Examine the wiring and circuitry for the relay that keeps the Run command enabled during the
momentary power loss ride-thru time.
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