Parameter Details
11
11.2 A: Initialization Parameters
YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual 689
Function Notes
I/O phase loss protection,
overtorque detection function
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.
Accel/Decel Time 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 for H2-xx = 8 or 1B [MFDO Function Select = 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 install the electromagnetic contactor between the drive and the motor, set L8-07 = 1 or 2
[Output Phase Loss Protection Sel = Fault when one phase is lost or Fault when two phases are
lost].
Adjustments Relating to Control
When there is oscillation, rollback, or other control problems, adjust the parameters as specified by the control
method.
V/f Control and Closed Loop V/f Control on page 689 shows only the frequently adjusted parameters.
Note:
Torque and speed response for high-resistance and high-slip motors are slow. Adjust the torque and speed response to increase them.
Low impedance (low-slip) motors will hunt and oscillate. Adjust the torque and speed response to increase them.
V/f Control and Closed Loop V/f Control
While in V/f Control, do not use C3-01 [Slip Compensation Gain].
While in Closed Loop V/f Control, continue to use default settings for C5-01 to C5-05 [ASR Parameters].
Significantly altering the default settings will likely cause oscillation.
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