YASKAWA GA800 Technical Reference page 708

12.2 A: Initialization Parameters
Figure 12.4 Holding Brake Open and Close Sequence Time Chart (CLV, CLV/PM)
*1 Start braking from the higher set frequency between b2-01 [DC Injection/Zero SpeedThreshold] or E1-09 [Minimum Output Frequency].
Notes on when Using Other Functions
Function
Stall Prevention during Deceleration
Auto-Tuning for Induction Motors
Auto-Tuning for PM Motors
Braking Resistor Overheat Protection
Continuous Operation
Torque Limit
708
When you connect a braking resistor to discharge the regenerative power to the drive, set L3-04 = 0 [Stall Prevention during Decel =
Disabled].
Note:
If L3-04 = 1 [General Purpose], it is possible that the drive will not stop in the set deceleration time. Do not change the default
settings of these related parameters:
• L3-01 = 1 [Stall Prevention during Accel = Enabled]
• L3-05 = 1 [Stall Prevention during RUN = Deceleration Time 1 (C1-02)]
• When A1-02 = 2, 3, 4 [Control Method Selection = Open Loop Vector, Closed Loop Vector, Advanced Open Loop Vector], Auto-Tune
the motor before you operate the drive.
• Disconnect the drive from the motor to do Rotational Auto-Tuning.
• Auto-Tuning runs automatically for approximately 1 minute. Do not do Auto-Tuning with the motor engaged in the elevator system.
Note:
• If you cannot disconnect the motor from the machine, do Stationary Auto-Tuning. During this time, the drive automatically
measures the necessary motor data. If the motor test report or the motor nameplate is not available, use Stationary Auto-Tuning.
Do Stationary Auto-Tuning for Line-to-Line Resistance for better torque characteristics at low speeds in the V/f Control mode.
• When you do Stationary Auto-Tuning, the drive energizes the motor and the motor stays stopped.
• To Auto-Tune a specialized motor, for example a wound motor, prepare a motor test report before Auto-Tuning and make sure that
the motor parameter E2-xx is not too different than the value in the test report.
You must set the motor data in the drive to run a PM motor.
• When you use a PM motor recommended by Yaskawa
Input the motor code in E5-01. E5 and other related motor parameters will be automatically set to the optimal values.
• When you use a non-Yaskawa PM motor
Do Auto-Tuning.
– When the motor nameplate or motor test report is available, enter the PM motor parameters directly with PM Motor Parameter
Settings.
– If the motor nameplate or motor test report is not available, and the motor cannot rotate, do PM Stationary Auto-Tuning.
– If the motor nameplate or motor test report is not available, and the motor can rotate, do PM Rotational Auto-Tuning.
– When you replace an encoder, make sure that the motor can rotate and do Z Pulse Offset Tuning or PM Rotational Auto-Tuning.
Note:
• Use in Closed Loop Vector Control for PM control method.
• When you do Auto-Tuning or replace the encoder, make sure that the motor can rotate.
• Set the Encoder Z-Pulse Offset.
• Refer to Closed Loop Vector Control for induction motors for information about the signal to use and the adjustment method.
When you use a braking resistor other than the optional Yaskawa braking resistor unit (LKEB-series), this function uses the thermal
overload relay to detect braking resistor overheat. Load a sequence program that cuts the drive input power supply when the braking
*1
resistor overheats.
Do not use the momentary power loss continuous operation function and the Auto Restart function. If you use these functions, there is a
risk that the motor will coast to a stop if the brake is open when there is a momentary power loss and the drive is operating or if there is a
fault.
Set the these parameters:
• L2-01 = 0 [Power Loss Ride Through Select = Disabled]
• L5-01 = 0 [Number of Auto-Restart Attempts = 0]
The motor rated torque sets the value for L7-01 to L7-04 [Torque Limit]. If there will not be sufficient torque during start up, replace the
drive with a larger capacity drive and set the torque limit between 200% and 300%. The L7-01 to L7-04 default setting is 200%.
Precautions
YASKAWA SIEPC71061737D GA800 Drive Technical Reference