YASKAWA iQpump Micro CIMR-PW Series User Manual page 434

D.3 UL and CSA Standards
• 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.
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YASKAWA TOEP YAIQPM 03B YASKAWA AC Drive - iQpump Micro User Manual