Function

Precautions

Stall Prevention during Deceleration

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)]

Auto-Tuning for Induction Motors

  • 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.

Auto-Tuning for PM Motors

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.

Braking Resistor Overheat Protection

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 resistor overheats.1

Continuous Operation

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]

Torque Limit

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%.

Input/Output Phase Loss Protection, Overtorque Detection

To stop a fall because of phase loss, set these parameters:

  • L8-05 = 1 [Input Phase Loss Protection Sel = Enabled]

  • L8-07 = 1 [Output Phase Loss Protection Sel = Fault when One Phase is Lost]

  • L6-01, L6-04 = 1 to 8 [Torque Detection Selection 1/2 = oL @ Speed Agree - Alarm only to UL @ RUN - Fault]

  • L6-02, L6-05 [Torque Detection Level 1/2]

  • L6-03, L6-06 [Torque Detection Time 1/2]

Note:

Use precautions, for example fall detection, on the machine side.

External Baseblock Command

  • If you enter the external baseblock signal set in H1-01 to H1-08 = 8 or 9 [Terminal S1 to S8 Function Selection = Baseblock Command] during run, the motor immediately coasts to stop. When you enter a baseblock command while the motor is operating, make sure that it is necessary.

  • When you use an external baseblock command for the fast stop and operation start up interlocks, load the sequence to lock the holding brake when you enter the external baseblock command.

  • If you enter the external baseblock command and then immediately remove it, the drive will not output the voltage in the time set in L2-03 [Minimum Baseblock Time]. Do not use an external baseblock command for applications that have frequent Run/Stop commands.

Acceleration and Deceleration Times

If you set the acceleration and deceleration times for the drive side too short and you do not add the mechanical operation delay time of the holding brake, the holding brake could operate late, or there could be overcurrent at start up, the brake could grind, or the motor could roll back when it stops. In these conditions, use Dwell Reference at Start/Time and DC Injection Braking at Stop to adjust the holding brake timing.

Electromagnetic Contactor on the Drive Output Side

Usually you must not install the electromagnetic contactor between the drive and motor. When you must install an electromagnetic contactor to use one drive to switchover more than one motor, follow these precautions:

  • Load a sequence that opens and closes the electromagnetic contactor when these two conditions are satisfied at the same time, unless there is an emergency:

    • The holding brake is fully closed

    • The drive terminals set for H2-xx = 8 or 1B [MFDO Function Selection = During Baseblock] are activated

  • If you open and close the electromagnetic contactor during motor control or during DC Injection Braking (or zero speed control), the surge voltage and the motor direct input current can cause the drive to detect faults.

  • When you use an electromagnetic contactor between the drive and motor, set L8-07 = 1 or 2 [Output Phase Loss Protection Sel = Fault when One Phase is Lost, Fault when Two Phases are Lost].
 
1

Refer to Standard Connection Diagram when you load the sequence circuit.