CHAPTER 7 MAINTENANCE AND INSPECTION

14. Internal Regenerative Resistor Overheat

[Display]

[Description of detected alarm]

rH1

[Cause and remedy]

The power consumption of the regenerative resistor built in the

servo amplifier exceeds the upper limit. (Detection is made at

the internal electronic thermal relay of the servo amplifier.)

Cause

Remedy

Excessive source voltage

(immediately after power-on)

Due to vertical transfer or

winding purpose, etc. the

regenerative power cannot be

consumed.

 Check if the source voltage is within specification limits.

 Insert a reactor if there is a power factor improvement capacitor.

 Increase the deceleration time.

 Decrease the servomotor rotation speed.

 Increase the cycle time and decrease the operation frequency.

 Connect an external regenerative resistor.

 Install a counterweight.

The regenerative resistor is not

connected.

Connect correctly. Set PA2_65 at 0 or 2.

Note: The internal regenerative resistor is possibly to get hot, so do not touch it.

15. External Regenerative Resistor Overheat

[Display]

[Description of detected alarm]

7

rH2

[Cause and remedy]

The external regenerative resistor overheat signal (normally closed

contact signal) has worked (was open).

Cause

Remedy

Excessive source voltage

(immediately after power-on)

Check if the source voltage is within the specification limits.

Due to vertical transfer or

winding purpose, etc. the

regenerative, power cannot be

consumed.

Wrong wiring of external

regenerative resistor overheat

signal

 Increase the deceleration time.

 Decrease the servomotor rotation speed.

 Increase the cycle time and decrease the operation frequency.

 Connect an external regenerative resistor.

 Install a counterweight.

Connect correctly.

Troubleshooting Method 7-11