Selection and protection of a motor
Parameter
6 - 68
NOTES
Fault by electronic thermal relay function is reset by inverter power reset and reset signal
input. Avoid unnecessary reset and power-off.
Install an external thermal relay (OCR) between the inverter and a motor when operating
several motors by one inverter, or when using a multi-pole motor or specialized motor. In this
case, set 0A to the electronic thermal O/L relay setting of the inverter. For the external ther-
mal relay, determine the setting value in consideration of the current indicated on the motor's
rating plate and the line-to-line leakage current. Self-cooling ability of a motor is reduced at
low speed operation. Use a motor with a built-in thermal protector.
When the difference between the inverter and motor capacities is large and the setting is
small, the protective characteristics of the electronic thermal relay function will be deterio-
rated. Thermal motor protection must be ensured by external motor protection (e.g. PTC ele-
ment, motor protection switch, etc.).
The operation time of the transistor protection thermal relay shortens when the Pr. 72 "PWM
frequency selection" setting increases.
Содержание FR-D720S SC EC
Страница 2: ......
Страница 4: ......
Страница 24: ...Description of the case Product checking and part identification 1 4 ...
Страница 108: ...Operation panel Operation 4 20 ...
Страница 436: ...Setting for the parameter unit and operation panel Parameter 6 286 ...
Страница 484: ...Measurements on the main circuit Maintenance and inspection 8 14 ...
Страница 504: ...Specification change Appendix A 20 ...
Страница 505: ......
Страница 506: ......
Страница 510: ...Index Appendix A 24 ...
Страница 511: ......