YASKAWA GA800 Programming Manual page 187

Function
I/O phase loss protection, overtorque
detection function
External baseblock command
Acceleration and deceleration times
Electromagnetic contactor on the drive
output side
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 187
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.
Table 2.15 Adjustment of Drive Control (V/f Control and Closed Loop V/f Control Methods)
Adjustment description
• Prevent hunting and oscillation
n1-02 [Hunting Prevention Gain
at middle-range speeds (10 Hz
Setting]
to 40 Hz)
• Increasing motor excitation
sound
C6-02 [Carrier Frequency
• Hunting and oscillation
Selection]
suppression at low speeds and
middle-range speeds
• Increase torque at low speeds
C4-01 [Torque Compensation
(10 Hz or lower)
Gain]
• Prevent hunting and oscillation
YASKAWA TOEPYAIGA8002B GA800 Drive Programming
To stop a fall because of motor 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.
• 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.
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.
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 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].
shows only the frequently adjusted parameters.
Parameter Number Possible Solutions
• If the torque is not sufficient
with heavy loads, decrease the
setting.
• If there is hunting or oscillation
with light loads, increase the
setting.
• If there is a loud motor
excitation sound, increase the
setting value.
• If there is hunting or oscillation
at low speeds or middle-range
speeds, decrease the setting
value.
• If the torque is not sufficient at
low speeds, increase the setting
value.
• If there is hunting or oscillation
with light loads, decrease the
setting value.
2.2 A: Initialization Parameters
Notes
Default Recommended Setting
1.00
*1
1.00
0.50 - 2.00
1 - F
2
0.50 - 1.50
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