Drive Frequency Reference Differs From The Controller Frequency Reference; Command; Excessive Motor Oscillation And Erratic Rotation; Deceleration Takes Longer Than Expected With Dynamic Braking Enabled - YASKAWA E1000 Technical Manual

6.10 Troubleshooting without Fault Display
Cause
Incorrect frequency reference setting.
The Stall Prevention level during acceleration and deceleration set
too low.
The Stall Prevention level during run has been set too low.
Drive reached the limitations of the V/f motor control method.

◆ Drive Frequency Reference Differs from the Controller Frequency Reference

Command

Cause
The analog input gain and bias for the frequency reference input
are set to incorrect values.
A frequency bias signal is being entered via analog input terminals
A1 to A3.
PI control is enabled, and the drive is consequently adjusting the
output frequency to match the PI setpoint. The drive will only
accelerate to the maximum output frequency set in E1-04 while PI
control is active.

◆ Excessive Motor Oscillation and Erratic Rotation

Cause
Poor balance between motor phases.
Hunting prevention function is disabled.

◆ Deceleration Takes Longer Than Expected with Dynamic Braking Enabled

Cause
L3-04 is set incorrectly.
The deceleration time is set too long.
Insufficient motor torque.
Reaching the torque limit.
Load exceeded the internal torque limit determined by the drive
rated current.

◆ Noise From Drive or Motor Cables When the Drive is Powered On

Cause
Relay switching in the drive generates excessive noise.

◆ Earth Leakage Circuit Breaker (ELCB) Trips During Run

Cause
Excessive leakage current trips ELCB.
292
• Check the multi-function analog input settings. Multi-function analog input terminal A1, A2, or A3 is set for
frequency gain (H3-02, H3-10, or H3-06 is set to "1"), but there is no voltage or current input provided.
• Make sure H3-02, H3-10, and H3-06 are set to the proper values.
• See if the analog input value is set to the right value (U1-13 to U1-15).
• Check the Stall Prevention level during acceleration (L3-02).
• If L3-02 is set too low, acceleration may be taking too long.
• Increase L3-02.
• Check the Stall Prevention level during run (L3-06).
• If L3-06 is set too low, speed will drop as the drive outputs torque.
• Increase the setting value.
• The motor cable may be long enough (over 50 m) to require Auto-Tuning for line-to-line resistance.
• Be aware that V/f Control is comparatively limited when it comes to producing torque at low speeds.
• Consider switching to Open Loop Vector Control.
• Check the gain and bias settings for the analog inputs that are used to set the frequency reference. Check parameters
H3-03 and H3-04 for input A1, check parameters H3-11 and H3-12 for input A2, and check parameters H3-07 and
H3-08 for input A3.
• Set these parameters to the appropriate values.
• If more than one of multi-function analog inputs A1 to A3 is set for frequency reference bias (H3-02, H3-10, or H3-06
is set to "0"), then the sum of all signals builds the frequency reference.
• Make sure that H3-02, H3-10, and H3-06 are set appropriately.
• Check the input level set for terminals A1 to A3 (U1-13 to U1-15).
If PI control is not necessary for the application, disable it by setting b5-01 to "0".
Check drive input power voltage to ensure that it provides stable power.
Enable Hunting Prevention (n1-01 = 1).
• Check the Stall Prevention level during deceleration (L3-04).
• If a dynamic braking option has been installed, disable Stall Prevention during deceleration (L3-04 = 0).
Set deceleration to more appropriate time (C1-02).
• Assuming parameter settings are normal and that no overvoltage occurs when there is insufficient torque, it is likely
that the demand on the motor has exceeded the motor capacity.
• Use a larger motor.
• If multi-function analog input terminal A1, A2, or A3 is set to torque limit (H3-02, H3-10, or H3-06 equals 10, 11, 12,
or 15), ensure that the analog input levels are set to the correct levels.
• Ensure H3-02, H3-10, and H3-06 are set to the right levels.
• Ensure the analog input is set to the correct value (U1-13 to U1-15).
Switch to a larger capacity drive.
• Lower the carrier frequency (C6-02).
• Install a noise filter on the input side of drive input power.
• Install a noise filter on the output side of the drive.
• Place the wiring inside a metal conduit to shield it from switching noise.
• Ground the drive and motor properly.
• Separate the main circuit wiring and the control lines.
• Make sure wires and the motor have been properly grounded.
• Increase the ELCB sensitivity or use ELCB with a higher threshold.
• Lower the carrier frequency (C6-02).
• Reduce the length of the cable used between the drive and the motor.
• Install a noise filter or reactor on the output side of the drive. Set the carrier frequency to 2 kHz when connecting a
reactor.
YASKAWA ELECTRIC SIEP C710616 35D YASKAWA AC Drive E1000 Technical Manual
Possible Solutions
Possible Solutions
Possible Solutions
Possible Solutions
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Possible Solutions