3. Installation of Frequency Inverter
EM15 User’s Manual
24
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When the input noise filter is installed, the cable connecting the filter to the inverter input power side shall be
as short as possible.
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The filter case and mounting cabinet shall be reliably grounded in large area to reduce the back flow
impedance of the noise current Ig.
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The cable connecting the inverter and the motor shall be as short as possible. The motor cable adopts 4-core
cable, The cable grounding end grounded at the inverter side, the other end connected to the motor case. The
motor cable shall be sleeved into the metal tube.
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The input power cable and output motor cable shall be kept away from each other as far as possible.
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The equipment and signal cables vulnerable to influence shall be kept far away from the inverter.
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Key signal cables shall adopt shielding cable. It is suggested that the shielding layer shall be grounded with
360-degree grounding method and sleeved into the metal tube. The signal cable shall be kept far away from the
inverter input cable and output motor cable. If the signal cable must cross the input cable and output motor
cable, they shall be kept orthogonal.
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When analog voltage and current signals are adopted for remote frequency setting, twinning shielding cable
shall be used. The shielding layer shall be connected to the grounding terminal PE of the inverter, and the
signal cable shall be no longer than 50m.
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The cables of the control circuit terminals TA/TB/TC and other control circuit terminals shall be separately
routed.
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It is forbidden to short circuit the shielding layer and other signal cables and the equipment.
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When the inverter is connected to the inductive load equipment (e.g. electromagnetic contactor, relay and
solenoid valve), surge suppressor must be installed on the load equipment coil, as showed in Diagram 3-10
Diagram 3-10 Application example of inductive load surge suppressor
