8Kmcb Control Circuit Terminal; Connection Precautions - Powtran PI8600 Series User Manual

2-5-2. Control circuit terminal
1.

8KMCB Control circuit terminal

2-6. Connection Precautions

Don‟t install power factor capacitance or resistance-capacitance absorbing device between
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the output terminals U, V, W of the frequency inverter.
To disassemble or replace the motor, the input power supply must be turned off for the
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frequency inverter.
Do not drop Metal scrap foam or lint into the frequency inverter, otherwise the machine will
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be faulted.
The motor or power supply can be switched on/off only after the inverter stops its output.
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※ In order to minimize the effect of electromagnetic interference, a surge absorbing device
should be installed if used electromagnetic contactor and relay, etc. is near to the frequency
inverter.
For external control of frequency inverter, a isolation device should be used for the control
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lines or screened cable should be used.
※ A screened cable should be used as the signal connection line for input command and must
be routed separately as well, and it had better be installed far from the main circuit.
When the carrier frequency is less than 3kHz, the distance between the frequency inverter
※
and motor must not be greater than 50 meters (maximum). When it is above 4kHz, this
distance should be reduced. The cable for this connection had better be laid in metal conduit.
※ If the frequency inverter is equipped with peripheral devices (such as filter, reactor), first
measure its insulation resistance to the earth with 1000V megohm meter, and ensure the
resistance value is not below 4MΩ.
If the frequency inverter must be started frequently, don‟t switch off its power supply, and
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the operator must start or stop the inverter by using the COM/FWD of the control terminal
or Keyboard or RS485, in order to avoid damage to the bridge rectifier.
Don‟t connect A.C. input power to the output terminals U, V, W of the frequency inverter.
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In order to prevent unexpected accidents, earthing terminal E or
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the earth securely (the grounding resistance should be below 100Ω). The cable size should
be greater than half of below- mentioned corresponding cable size; otherwise current leakage
will happen possibly.
For wiring of main circuit, please refer to national rule.
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Capacity of the motor should be equal to or smaller than that of the inverter.
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Specification of MCCB、electric cable and contractor。
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Section II Installtion & Standby Circuit
7
must be grounded to