Motor Operates At A Higher Speed Than The Speed Command; Peripheral Devices Affected By Drive Operation; Ground Fault Interrupter Activates When Drive Is Running - YASKAWA V1000 Series Installation & Start-Up Manual

Motor Operates at a Higher Speed than the Speed Command

■
Cause
PID is enabled. If the PID mode is
enabled (b5-01 = 1 to 4), the drive output
frequency will change to regulate the
process variable to the target setpoint.
The PID can command a speed up to
maximum output frequency
(E1-04).
Poor Speed Control Accuracy Above Base Speed in Open-Loop Vector
■
Motor Control Method
Cause
The maximum output voltage of the
drive is determined by its input voltage.
Vector control uses voltage to control the
currents within the motor. If the vector
control voltage reference value exceeds
the drive output voltage capability, the
speed control accuracy will decrease
because the motor currents cannot be
properly controlled.

Peripheral Devices Affected by Drive Operation

■
Cause
Radio frequency interference may be
generated by drive output PWM
waveform.

Ground Fault Interrupter Activates When Drive is Running

■
Cause
The output of the drive is a series of high
frequency pulses (PWM), so there is a
certain amount of leakage current. This
may cause the ground fault interrupter to
operate and cut off the drive input power.
YASKAWA ELECTRIC TOEP C710606 09B YASKAWA AC Drive V1000 Installation & Start-Up Manual
5.9 Troubleshooting without Fault Display
Possible Solution
If PID operation is not target, disable PID by setting b5-01 = "0".
Possible Solution
Use a motor with a lower rated voltage compared to the input voltage, or
change to flux vector control.
Possible Solutions
• Change the Carrier Frequency Selection (C6-02) to lower the carrier
frequency. This will help to reduce the amount of transistor switching
noise.
• Install an Input Noise Filter at the input power terminals.
• Install an Output Noise Filter at the motor terminals.
• Use conduit. Metal can shield electrical noise.
• Ground the drive and motor.
• Separate main circuit wiring from control wiring.
Possible Solutions
• Change to a ground fault interrupter with a higher leakage current
detection level (such as, a sensitivity current of 200 mA or greater per
Unit, with an operating time of 0.1 s or more), or one that incorporates
high-frequency countermeasures.
• Change the Carrier Frequency Selection (C6-02) to lower the carrier
frequency. Note: Leakage current increases in proportion to cable length.
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