YASKAWA V1000 Series Installation & Start-Up Manual

5.10 Detailed Troubleshooting
254 YASKAWA TM.V1000.01 V1000 Drive Installation & Start-Up Manual (Preliminary 01-19-07)
■ Drive Frequency Reference Differs from the Controller Frequency
Reference Command
■ Poor Speed Control Accuracy
■ Deceleration Takes Too Long With Dynamic Braking Enabled
Cause Possible Solutions
The analog input frequency gain and bias
are set to incorrect values.
• Check the frequency reference terminal input gain level assigned to
terminals A1 and A2, as well as the frequency reference input bias to
terminal A1 (parameters H3-03, H3-04 and H3-11).
• The settings mentioned above are added to the frequency reference.
• Set these parameters to the appropriate values.
A frequency bias signal is being entered
via analog input terminals A1 or A2.
• If multi-function analog input terminals A1 and A2 are set for frequency
reference (H3-02 = 0 and H3-10 = 0), the addition of both signals builds
the frequency reference.
• Ensure that H3-02 and H3-10 are set appropriately.
• Check the input level set for terminals A1 and A2.
Cause Possible Solutions
Drive has reached the slip compensation
limit.
• Check the slip compensation limit (C3-03).
• Increase the value set to C3-03.
Motor-rated voltage is set too high in
Open Loop Vector Control.
• The input voltage for the drive determines the maximum output voltage.
A drive with an input of 200 Vac can only output a maximum of 200 Vac.
Open Loop Vector Control sometimes calculates an output voltage
reference value that exceeds the maximum drive output voltage level,
resulting in a loss of speed control accuracy.
• Use a motor with a lower voltage rating (a vector control motor).
• Increase the input power voltage.
Cause Possible Solutions
L3-04 is set incorrectly.
• Check the Stall Prevention Level during deceleration (L3-04).
• If a braking resistor option has been installed, disable Stall Prevention
during deceleration (L3-04 = “0”).
The deceleration time is set too long.
Set the deceleration to a more appropriate time (C1-02, C1-04, C1-06,
C1-08).
Insufficient motor torque.
• 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.

YASKAWA V1000 Series Specifications

General

Model	V1000 Series
Series	V1000
Output Frequency	0.1 to 400 Hz
Overload Capacity	150% for 60 seconds
Type	AC Drive
Control Method	V/f Control
Input Voltage	200-240V, 380-480V
Output Voltage	0 to Input Voltage
Power Range	0.1 to 18.5 kW
Horsepower	0.2 to 25 HP
Protection Features	Overcurrent, Overvoltage, Undervoltage, Overheating, Short Circuit, Ground Fault
Communication Interfaces	Modbus RTU
Enclosure	IP20
Ambient Temperature	-10 to +50°C
Storage Temperature	-20 to +60°C
Humidity	5 to 95% RH (non-condensing)
Cooling Method	Fan Cooled