5.2 Motor Performance Fine Tuning
YASKAWA TM.V1000.01 V1000 Drive Installation & Start-Up Manual (Preliminary 01-19-07) 191
Troubleshooting
5
◆ Motor Hunting and Oscillation Control Parameters
The following parameters indirectly affect motor hunting and oscillation.
Table 5.3 Parameters that Affect Control Performance in Applications
Name (Parameter No.) Application
Dwell Function
(b6-01 through b6-04)
Prevents motor speed loss by maintaining the output frequency when working
with heavy loads or when there is powerful backlash on the machine side.
Accel/Decel Time
(C1-01 through C1-08)
Adjusting accel and decel times will affect the torque presented to the motor
during acceleration or deceleration.
S-Curve Characteristics
(C2-01 through C2-04)
Prevents shock at the beginning and end of acceleration and deceleration.
Jump Frequency
(d3-01 through d3-04)
Skips over the resonant frequencies of connected machinery.
Analog Filter Time Constant
(H3-13)
Prevents fluctuation in the analog input signal due to noise.
Stall Prevention
(L3-01 through L3-06, L3-11)
• Prevents motor speed loss and overvoltage. Used when the load is too heavy and
also during sudden acceleration/deceleration.
• Adjustment is not normally required because Stall Prevention is enabled as a
default. Disable Stall Prevention during deceleration (L3-04 = “0”) when using a
braking resistor.
Torque Limits
(L7-01 through L3-04, L3-06,
L3-07)
• Sets the maximum torque for Open Loop Vector Control.
• Ensure that the drive capacity is greater than the motor capacity when increasing
this setting. Be careful when reducing this value because motor speed loss may
occur with heavy loads.
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