The Motor Is Too Hot; There Is Audible Noise From The Drive Or Motor Cables When The Drive Is Energized; Earth Leakage Circuit Breaker (Elcb) Trips During Run; Flux Compensation (Current Suppression At Start) - YASKAWA CIPR-CR70A Series Technical Manual

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The Motor Is Too Hot

Causes
The load is too heavy.
The motor is running continuously at a very low speed.
The drive is operating in a vector control mode, but Auto-
Tuning has not been done.
The voltage insulation between motor phases is not
sufficient.
The air around the motor is too hot.
The motor fan stopped or is clogged.
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There Is Audible Noise from the Drive or Motor Cables When the Drive Is Energized

Causes
The relay switching in the drive is making too much noise.
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Earth Leakage Circuit Breaker (ELCB) Trips During Run

Causes
There is too much leakage current from the drive.
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Flux Compensation (Current Suppression at Start)

Find motor torque using the following formula.
YASKAWA ELECTRIC SIEP C710617 19A YASKAWA AC Drive CR700 Technical Manual
3 Startup Procedure and Test Run
Possible Solutions
• Decrease the load.
• Increase the acceleration and deceleration times.
• Examine the values set in L1-01 [Motor Overload (oL1) Protection], L1-
02 [Motor Overload Protection Time], and E2-01 [Motor Rated Current
(FLA)].
• Use a larger motor.
Note:
The motor also has a short-term overload rating. Examine this rating
carefully before setting drive parameters.
• Change the run speed.
• Use a drive-dedicated motor.
• Do Auto-Tuning.
• Calculate motor parameter and set motor parameters.
• Set A1-02 = 0 [Control Method Selection = V/f Control].
• Use a motor with a voltage tolerance that is higher than the maximum
voltage surge.
• Use a drive-dedicated motor that is rated for use with AC drives for
applications that use a motor on drives rated higher than 400 V class.
• Install an AC reactor on the output side of the drive and set C6-02 = 1
[Carrier Frequency Selection = 2.0 kHz].
Note:
When the motor is connected to the drive output terminals U/T1, V/T2,
and W/T3, surges occur between the drive switching and the motor coils.
These surges can be three times the drive input power supply voltage
(600 V for a 200 V class drive, 1200 V for a 400 V class drive).
• Measure the ambient temperature.
• Decrease the temperature in the area until it is in the specified
temperature range.
• Clean the motor fan.
• Make the drive environment better.
Possible Solutions
• 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.
Possible Solutions
• Increase the ELCB sensitivity or use ELCB with a higher threshold.
• Use C6-02 [Carrier Frequency Selection] to decrease the carrier
frequency.
• Decrease the length of the cable used between the drive and the motor.
• Install a noise filter or AC reactor on the output side of the drive. Set C6-
02 = 1 [2.0 kHz] when connecting an AC reactor.
• Disable the internal EMC filter.
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