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6.10 Troubleshooting without Fault Display
386
YASKAWA ELECTRIC
SIEP C710636 02B YASKAWA U1000 Technical Manual
Note:
Check the motor specifications for the forward and reverse directions. The motor specifications will vary depending on the
manufacturer of the motor.
■
Motor Rotates in One Direction Only
◆
Motor is Too Hot
◆
Drive Does Not Allow Selection the Desired Auto-Tuning Mode
◆
oPE02 Error Occurs When Lowering the Motor Rated Current Setting
◆
Motor Stalls during Acceleration or Acceleration Time is Too Long
Cause
Possible Solutions
The drive prohibits reverse rotation.
• Check parameter b1-04.
• Set the drive to allow the motor to rotate in reverse (b1-04 = 0).
A Reverse run signal has not been entered, although 3-wire
sequence is selected.
Make sure that one of the input terminals S3 to S8 used for the 3-wire sequence has been set for reverse.
Cause
Possible Solutions
The load is too heavy.
If the load is too heavy for the motor, the motor will overheat as it exceeds its rated torque value for an extended
period of time.
Keep in mind that the motor also has a short-term overload rating in addition to the possible solutions provided below:
• Reduce the load.
• Increase the acceleration and deceleration times.
• Check the values set for the motor protection (L1-01, L1-02) as well as the motor rated current (E2-01).
• Increase motor capacity.
The air around the motor is too hot.
• Check the ambient temperature.
• Cool the area until it is within the specified temperature range.
The drive is operating in a vector control mode but Auto-Tuning has
not yet been performed.
• Perform Auto-Tuning.
• Calculate the motor value and reset the motor parameters.
• Change the motor control method to V/f Control (A1-02 = 0).
Insufficient voltage insulation between motor phases.
When the motor cable is long, high voltage surges occur between the motor coils and drive switching.
Normally, surges can reach up to three times the drive input power supply voltage (600 V for 200 V class, and 1200 V
for 400 V class).
• Use a motor with a voltage tolerance higher than the max voltage surge.
• Use a motor designed to work specifically with a drive when using a 400 V class unit.
The motor fan has stopped or is clogged.
Check the motor fan.
Carrier frequency is too low.
Increase the carrier frequency to lower the current harmonic distortion and lower the motor temperature.
Cause
Possible Solutions
The desired Auto-Tuning mode is not available for the selected
control mode.
• Check if the desired tuning mode is available for the selected control mode. Refer to
.
• Change the motor control method by setting A1-02.
Cause
Possible Solutions
Motor rated current and the motor no-load current setting in the
drive are incorrect.
• The user is trying to set the motor rated current in E2-01 to a value lower than the no-load current set in E2-03.
• Make sure that value set in E2-01 is higher than E2-03.
• If it is necessary to set E2-01 lower than E2-03, first lower the value set to E2-03, then change the setting in E2-01
as needed.
Cause
Possible Solutions
Torque limit has been reached or current suppression keeps the drive
from accelerating.
Take the following steps to resolve the problem:
• Reduce the load.
• Increase motor capacity.
Note:
Although the drive has a Stall Prevention function and a Torque Compensation Limit function, accelerating too
quickly or trying to drive an excessively large load can exceed the capabilities of the motor.
Load is too heavy.
Torque limit is not set properly.
Check the torque limit setting.
Frequency reference is too low.
• Check the maximum output frequency (E1-04).
• Increase E1-04 if it is set too low.
Check U1-01 for proper frequency reference.
Check if a frequency reference signal switch has been set to one of the multi-function input terminals.
Check for low gain level set to terminals A1, A2, or A3 (H3-03, H3-11, H3-07).
Load is too heavy.
• Reduce the load so that the output current remains within the motor rated current.
• In extruder and mixer applications, the load will sometimes increase as the temperature drops.
• Increase the acceleration time.
• Check if the mechanical brake is fully releasing as it should.
Acceleration time has been set too long.
Check if the acceleration time parameters have been set too long (C1-01, C1-03, C1-05, C1-07).
Motor characteristics and drive parameter settings are incompatible
with one another.
• Set the correct V/f pattern so that it matches the characteristics of the motor being used.
• Check the V/f pattern set to E1-03.
• Execute Rotational Auto-Tuning.
SIEP_C710636_02B_1_0.book 386 ページ 2015年11月25日 水曜日 午後4時56分