YASKAWA V1000 Series Installation & Start-Up Manual page 261

Motor Rotates in One Direction Only
■
Cause
"Reverse run prohibited" is selected. If
b1-04 (Reverse Prohibit Operation) is set
to 1 (reverse run prohibited), the drive
will not accept a reverse run command.
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.
YASKAWA TM.V1000.01 V1000 Drive Installation & Start-Up Manual (Preliminary 01-19-07)
5.10 Detailed Troubleshooting
Possible Solution
Set b1-04 = "0" to allow reverse run operation.
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.
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