CHAPTER 7 MAINTENANCE AND INSPECTION
Troubleshooting Method 7-9
7
9. Regenerative Resistor Overheat
[Display] [Description of detected alarm]
[Cause and remedy]
Cause Remedy
High source voltage
(immediately after power-on)
Check if the source voltage is within the specification limits.
Insert a reactor if there is a power factor improvement
capacitor.
Too large regeneration
power
Increase the deceleration time.
Decrease the servomotor rotation speed.
Increase the dwell and decrease the regeneration frequency.
10. Encoder Communication Error
[Display] [Description of detected alarm]
[Cause and remedy]
Cause Remedy
Error in encoder serial
communications
Broken wire or poor contact
Check cables visually and through continuity check and
correct faults.
Check for the broken wire in the encoder cable and correct if
broken.
Insert ferrite cores.
The servo amplifier and encoder communicate through high speed serial communications.
The encoder signal has a voltage amplitude of about 5 V. Do not route the encoder cable in a
strong magnetic or electric field. Route the encoder cable separately from the main body of the
servo amplifier, inverter, electromagnetic contactor or similar (reserve at least 100 mm).
11. Cont (Control signal) Error
[Display] [Description of detected alarm]
[Cause and remedy]
Cause Remedy
The same input signal is allocated to two or
more terminals.
Do not specify the same number among
CONT signal settings.
There is duplication in allocation of sequence input terminals of
the servo amplifier.
The regeneration handling transistor built in the servo
amplifier is overheated.
Communications with the internal encoder of the servomotor
fails.
tH
Ec
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