Powtran PI9100 Series Manual page 204

※ In order to minimize the effects of electromagnetic interference, it is recommended
that a surge absorption device shall be installed additionally when electromagnetic
contactor and relay is closer from the inverter.
※ External control lines of inverter shall adopt isolation device or shielded wire.
※ In addition to shielding, the wiring of input command signal should also be aligned
separately, it is best to stay away from the main circuit wiring.
※ If the carrier frequency is less than 3KHz, the maximum distance between the
inverter and the motor should be within 50 meters; if the carrier frequency is
greater than 4KHz, the distance should be reduced appropriately, it is best to lay
the wiring inside metal tube.
※ When the inverter is additionally equipped with peripherals (filter, reactor, etc.),
firstly measure its insulation resistance to ground by using 1000 volt megger, so as
to ensure the measured value is no less than 4 megohms.
※ When the inverter need to be started frequently, do not directly turn power off, only
the control terminal or keyboard or RS485 operation command can be used to
control the start/stop operation, in order to avoid damage to the rectifier bridge.
※ Do not connect the AC input power to the inverter output terminals(U, V, W).
※ To prevent the occurrence of an accident, the ground terminal( )must be earthed
firmly(grounding impedance should be less than 10 ohms), otherwise the leakage
current will occur.
※ The specifications on wires used by the main circuit wiring shall comply with the
relevant provisions of the National Electrical Code.
※ The motor's capacity should be equal to or less than the inverter's capacity.
8-7.Spare Circuit
When the inverter occurs the fault or trip, which will cause a larger loss of
downtime or other unexpected faults. In order to avoid this case from happening, please
additionally install spare circuit to ensure safety.
Note: the characteristics of spare circuit must be confirmed and tested beforehand,
and its power-frequency shall be in accordance with the phase sequence of the inverter.
Three-phase power
Chapter 8 Installation and Spare Circuit
Inverter
Interlocked
AC contactor
199