Yaskawa Z1000U - Manual (Page 223)

Cause Possible Solutions
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.
• Use a motor with a voltage tolerance higher than the maximum voltage surge.
• Use an inverter-duty motor rated for use with AC drives when using the motor on drives rated
higher than 200 V class.
The motor fan has stopped or is clogged. Check the motor fan.
The carrier frequency is too low.
Increase the carrier frequency to lower the current harmonic distortion and lower the motor
temperature.
u Drive Does Not Allow Selection of the Desired Auto-Tuning Mode
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 Auto-
Tuning on page 131 .
• Change the motor control method by setting A1-02.
u oPE02 Error Occurs When Lowering the Motor Rated Current Setting
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.
u Motor Stalls during Acceleration or Acceleration Time is Too Long
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.
Although the drive is operating in Open Loop Vector
motor control method, Auto-Tuning has not been
performed.
• Perform Auto-Tuning.
• Calculate motor data and reset motor parameters.
• Switch to V/f Control (A1-02 = 0).
5.10 Troubleshooting without Fault Display
YASKAWA ELECTRIC TOEP C710636 10B Z1000U HVAC MATRIX Drive User Manual 223
5
Troubleshooting