(7) Prohibition of Installation of Phase Advancing Capacitor
Do not connect a phase advancing capacitor or surge absorber to main circuit power supply input (R/L1, S/L2,
or T/L3) of a power regeneration converter. The phase advancing capacitor or surge absorber may become
overheated and damaged by the harmonic components of the Σ-V-SD driver. Also, the Σ-V-SD driver may
malfunction because of overcurrent.
(8) Designing the Power ON Sequence
Take the following points into consideration when designing the power ON sequence.
•The main circuit power supply must turn ON only after it has been confirmed that no servo alarm has
occurred.
•The main circuit power supply must turn OFF when a servo alarm occurs during operation. The state of the
motor must be considered when the main circuit power supply is turned OFF during operation. For details,
refer to 7.2.1 (9) Typical Main Circuit Wiring Example.
(9) Typical Main Circuit Wiring Example
The typical main circuit wiring examples is shown below.
∗ A host controller is not provided by Yaskawa.
WARNING
•Do not touch the power terminals before the main-circuit capacitor has had time to discharge because
high voltage may still remain in the converter and SERVOPACK. Refer to this section for the details of dis-
charge time of main-circuit capacitor.
After the charge indicator goes out, check the voltage on the DC bus line (i.e., between the P and N terminals) with a
voltage tester or other device and confirm safety before you perform wiring or inspection work.
1QF: Molded-case circuit breaker
1FIL: Noise filter
1KM: Magnetic contactor
(for control power supply)
2KM: Magnetic contactor
(for main circuit power supply)
3KM: Magnetic contactor
(for emergency stop)
1Ry: Relay
1PL: Indicator lamp
1SA: Surge absorber
2SA: Surge absorber
3SA: Surge absorber
4SA: Surge absorber
1D: Flywheel diode
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