YASKAWA CR700

11.2 A: Initialization Parameters
578 YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual
Time Chart
This time chart shows the open/close sequence of the holding brake.
Figure 11.3 Holding Brake Open and Close Sequence Time Chart (V/f, CL-V/f, OLV)
*1 Start braking from higher set frequency between b2-01 [DC Injection/Zero SpeedThreshold] or E1-09 [Minimum Output Frequency].
Figure 11.4 Holding Brake Open and Close Sequence Time Chart (CLV)
*1 Start braking from higher set frequency between b2-01 [DC Injection/Zero SpeedThreshold] or E1-09 [Minimum Output Frequency].
Notes on When Using Other Functions
Function Notes
Decel Stall Prevention Function When you connect a braking resistor to discharge the regenerative power to the drive, keep 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)]
Auto-Tuning for Induction Motors
• When A1-02 = 2, 3, or 4 [Control Method Selection = Open Loop Vector, Closed Loop Vector, or 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. When you do Stationary Auto-Tuning, the
drive energizes the motor and the motor stays stopped. 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
• 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.
Braking Resistor Overheat Protection
When you use a braking resistor other than the optional Yaskawa braking resistor unit (LKEB-series), use the thermal overload relay
to detect braking resistor overheat. Load a sequence program that cuts the drive input power supply when the braking resistor
overheats.
Note:
When you load the sequence circuit, refer to “Standard Connection Diagrams”.
Torque Limit Function
The L7-01 to L7-04 [Torque Limit] value is based on the motor rated torque. When torque will likely be insufficient during startup,
replace the drive with a large capacity drive and adjust the torque limit between 200% and 300%. The L7-01 to L7-04 default setting
is 200%.