10 Standards Compliance
10-6
10.3 Precautions for Complying with UL Standards
This drive has been tested according to UL standard UL508C, and it fully complies with the UL requirements.
To comply with the UL standard, be sure to meet the following conditions when combining this drive with
other devices.
(1) Installation Location
Install the servo drive in a location with a pollution degree of 2 or lower according to UL specifications. Install
at an altitude of 1000 m max.
(2) Wiring the Main Circuit Terminals
Wire the main circuit terminals with the maximum tightening toque that is given in 7.2.1 (1) Wire Sizes and
Tightening Torques.
(3) Short-circuit Rating
This servo drive has undergone UL short-circuit testing using a power supply with a current of 31,000 A max-
imum and a voltage of 480 V maximum.
(4) 24-VDC Control Power Supply
Use a 24-VDC control power supply with double insulation or reinforced insulation.
(5) AC Reactor
Use an AC reactor for UL compliance according to 5.2.1 Specifications.
(6) Magnetic Contactor for Winding Selection
Use a magnetic contactor for winding selection for UL compliance according to 5.3.1 Specifications.
(7) Heat Sink Cooling
Provide an airflow of 2.5 m/s or higher in the ventilation duct to cool the heat sink. Or, use a Yaskawa base
mounting unit.
Refer to 5.5 Base Mounting Units for information on the base mounting unit.
(8) Grounding
Ground the neutral point of a 400-V power supply.
The leakage current may exceed 3.5 mA. Therefore, use a 10-mm
2
or thicker copper grounding wire.
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