Pi Output Fault; Motor Rotates After The Drive Output Is Shut Off (Motor Rotates During Dc Injection Braking); Output Frequency Is Not As High As Frequency Reference; Sound From Motor - YASKAWA Z1000 Technical Manual

n Oscillation or Hunting
Cause
Gain is too low when using PI control.
The frequency reference is assigned to an external
source and the signal is noisy.
The cable between the drive and motor is too long.
u

PI Output Fault

Cause
No PI feedback input.
The level of detection and the target value do not
correspond with each other.
Reverse drive output frequency and speed detection.
When output frequency rises, the sensor detects a
speed decrease.
PI parameter setting adjustments are insufficient.
u
Motor Rotates after the Drive Output is Shut Off (Motor Rotates During DC Injection
Braking)
Cause
DC Injection Braking is set too low and the drive
cannot decelerate properly.
The stopping method is set so that the drive coasts to
stop.
u

Output Frequency is Not as High as Frequency Reference

Cause
Frequency reference is set within the range of the Jump
frequency.
Large load triggered Stall Prevention function during
acceleration.
u

Sound from Motor

Cause
Exceeded 110% of the rated output current of the drive
while operating at low speeds.
YASKAWA ELECTRIC SIEP YAIZ1B 01E YASKAWA AC Drive – Z1000 Bypass Technical Manual
Refer to b5: PI Control on page 128
• Ensure that noise is not affecting the signal lines.
• Separate main circuit wiring and control circuit wiring.
• Use twisted-pair cables or shielded wiring for the control circuit.
• Increase the analog input time filter constant (H3-13).
• Perform Auto-Tuning for line-to-line resistance.
• Reduce the length of the cable.
• Check the multi-function analog input terminal settings.
• Set multi-function analog input terminal A1 or, A2 for PI feedback (H3-02 or H3-10 = B).
• A signal input to the terminal selection for PI feedback is needed.
• Check the connection of the feedback signal.
• Check the various PI-related parameter settings.
• No PI feedback input to the terminal causes the value detected to be 0, causing a PI fault and
the drive to operate at max frequency.
• PI control keeps the difference between target and detection values at 0. Set the input level for
the values relative to one another.
• Use analog input gains H3-03 and H3-11 to adjust PI target and feedback signal scaling.
Set PI output for reverse characteristics (b5-09 = 1).
Refer to b5: PI Control on page 128
• Adjust the DC Injection braking settings.
• Increase the current level for DC Injection Braking Current (b2-02).
• Increase the DC Injection Braking time at stop (b2-04).
Set b1-03 (Stopping Method Selection) to 0 or 2.
• Adjust the parameters used for the Jump frequency function (d3-01, d3-02, d3-03).
• Enabling the Jump frequency prevents the drive from outputting the frequencies specified in
the Jump range.
• Reduce the load.
• Adjust the Stall Prevention level during acceleration (L3-02).
• If the output current rises too high at low speeds, the carrier frequency is automatically reduced
and causes a whining or buzzing sound.
• If the sound is coming from the motor, disable carrier frequency derating (L8-38 = 0).
• Disabling the automatic carrier frequency derating increases the chances of an overload fault
(oL2). Switch to a larger capacity motor if oL2 faults occur too frequently.
6.9 Troubleshooting without Fault Display
Possible Solutions
for details.
Possible Solutions
for details.
Possible Solutions
Possible Solutions
Possible Solutions
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