Pid Output Fault; Insufficient Starting Torque; Motor Rotates After The Drive Output Is Shut Off; Output Frequency Is Not As High As Frequency Reference - YASKAWA GA700 Technical Manual

6.10 Troubleshooting without Fault Display
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PID Output Fault

Cause
No PID 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.
◆

Insufficient Starting Torque

Cause
Auto-Tuning has not been performed in vector control
mode.
The control mode was changed after performing Auto-
Tuning.
Stationary Auto-Tuning for Line-to-Line Resistance was
performed.
◆

Motor Rotates after the Drive Output is Shut Off

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.
◆

Output Frequency is not as High as Frequency Reference

Cause
Frequency reference is set within the range of the Jump
frequency.
Upper limit for the frequency reference has been exceeded.
Large load triggered Stall Prevention function during
acceleration.
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• Check the multi-function analog input terminal settings.
• Check whether H3-02, H3-10, H3-06 = B [MFAI Function Select = PID
Feedback] has been set.
• Check whether the multi-function analog input terminal settings match
the actual signal inputs.
• Check the connection of the feedback signal.
• Check whether b5-xx [PID Control] has been set correctly.
Note:
No PID feedback input to the terminal causes the value detected to be 0,
causing a PID fault and the drive to operate at max frequency.
Use H3-03, H3-11, H3-07 [Terminal A1, A2, A3 Gain Setting] to adjust PID
target and feedback signal scaling.
Note:
The PID function performs control such that the deviation between the
target value and the detected value becomes 0. PID control keeps the
difference between target and detection values at 0. For this reason, set
the input level for the values relative to one another.
Set b5-09 = 1 [PID Output Level Selection = Reverse output (reverse
acting)].
Perform Auto-Tuning.
Perform Auto-Tuning again.
Perform Rotational Auto-Tuning.
• Increase the value set in b2-02 [DC Injection Braking Current].
• Increase the value set in b2-04 [DC Inject Braking Time at Stop].
Set b1-03 = 0 or 2 [Stopping Method Selection = Ramp to Stop, DC
Injection Braking to Stop].
Adjust d3-01 to d3-03 [Jump Frequency 1 to 3] and d3-04 [Jump
Frequency Width].
Note:
Enabling the Jump frequency prevents the drive from outputting the
frequencies specified in the Jump range.
Set E1-04 [Maximum Output Frequency] and d2-01 [Frequency Reference
Upper Limit] to optimal values.
Note:
The following calculation yields the upper value for the output
frequency:
E1-04 × d2-01 / 100
• Reduce the load.
• Adjust L3-02 [Stall Prevent Level during Accel].
YASKAWA ELECTRIC SIEP C710617 01B YASKAWA AC Drive GA700 Technical Manual
Possible Solution
Possible Solution
Possible Solution
Possible Solution