6.10 Troubleshooting Without Fault Display
394 YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual
◆ Deceleration Takes Longer Than Expected When Dynamic Braking Is Enabled
Causes Possible Solutions
The stall prevention during deceleration setting is incorrect. • Examine the setting for L3-04 [Decel Stall Prevention Selection].
• When the drive has a dynamic braking option installed, set L3-04 = 0
[Disabled].
• If the drive detects ov [Overvoltage], set L3-04 = 3 [General Purpose w/
DB resistor].
The deceleration time setting is too long. Set C1-02, C1-04, C1-06, or C1-08 [Deceleration Times] to applicable
values.
The motor torque is not sufficient. Use a larger motor.
Note:
If these items are correct, the demand on the motor is more than the
motor capacity:
• Parameter settings are correct.
• The drive does not detect ov [Overvoltage].
The drive and motor system reached the torque limit. • Examine the values set in L7-01 to L7-04 [Torque Limit] and increase
them if necessary.
Note:
If the torque limit is enabled, deceleration time can increase because the
drive cannot output more torque than the limit.
• If H3-02, H3-10, H3-06 = 10, 11, 12, 15 [MFAI Function Select =
Torque Limit] has been set, examine the settings for the MFAIs.
• Examine the values set in H3-02, H3-10, and H3-06.
• Use U1-13 to U1-15 [Terminal A1, A2, A3 Input Voltage] to make sure
that the analog input values set to terminals A1, A2, and A3 are
applicable.
The load is more than the internal torque limit as specified
by the drive rated current.
Replace the drive with a larger capacity model.
◆ The Load Falls When a Brake Is Applied
Causes Possible Solutions
The open/close timing of the brake is incorrect. Refer to “Notes on Controlling the Brake when Using the Hoist Application
Preset” in the technical manual and take appropriate measures.
The DC injection braking is not sufficient. Increase the value set in b2-02 [DC Injection Braking Current].
◆ There Is Audible Noise from the Drive or Motor Cables When the Drive Is
Energized
Causes Possible Solutions
The relay switching in the drive is making too much noise. • Use C6-02 [Carrier Frequency Selection] to decrease the carrier
frequency.
• Connect a noise filter to the input side of the drive power supply.
• Connect a noise filter to the output side of the drive.
• Isolate the control circuit wiring from the main circuit wiring.
• Use a metal cable gland to wire the drive.
• Shield the periphery of the drive with metal.
• Make sure that the drive and motor are grounded correctly.
• Make sure that ground faults have not occurred in the wiring or motor.
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