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APPENDIX
A.1.3 Short Circuit Ratings
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200 V class
Suitable for use in a circuit capable of delivering not more than 5 kA rms symmetrical amperes, 264 V Maximum.
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400 V class
Suitable for use in a circuit capable of delivering not more than 5 kA rms symmetrical amperes, 528 V Maximum.
CAUTION
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Protective function by electronic thermal relay function is reset by inverter power reset and reset signal input. Avoid unnecessary
reset and power-OFF.
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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 special motor. In this case, set 0A to the electronic thermal O/L relay setting of the inverter.
For the external thermal 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.
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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 deteriorated. In this case, use an external thermal relay.
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A special motor cannot be protected by the electronic thermal relay function. Use an external thermal relay.
Содержание FR-D720S-008SC
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