Yaskawa J1000 Compact Vector Control Drive User Manual

Page 235

Installation Precautions

• To ensure the Safe Disable function appropriately fulfills the safety requirements of the

application, a thorough risk assessment for the safety system must be carried out.

• The drive must be installed in an enclosure with a protection degree of at least IP54 in order

to maintain ISO/EN 13849-1, safety category 3 compliance.

• If the safety device and the drive are installed in separate cabinets, install the Safe Disable

wires in a manner preventing short circuits.

• The Safe Disable function does not cut the power supply to the drive and does not provide

electrical isolation. Before any installation or maintenance work is done, the power supply

of the drive must be switched off.

• Consider the following when using PM motors: When the Safe Disable function is active,

a failure in two of the drive power devices can occur and current will continue to flow

through the motor winding. This failure will not produce torque in an induction motor,

however, when occurring in a PM motor, torque will be produced and cause an alignment

of the rotor magnets, which may cause the rotor to turn up to 180 degrees electrically. Ensure

that this possible failure mode is not safety-critical for the application.

• The wiring distance for the Safe Disable inputs should not exceed 30 m.
• The time from opening the Safe Disable input until the drive output is switched off is less

than 1 ms.

C.3 Safe Disable Input Precautions

YASKAWA ELECTRIC TOEP C710606 47C YASKAWA AC Drive – V1000 Quick Start Guide

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Standards Compliance