Radio Noise Reduction Filter; Emc Filter; Braking Resistor, Braking Unit; Motor-End Surge Voltage Suppression Filter, Optional Control Power Supply - Toshiba TOSVERT VF-AS3 Instruction Manual

10. 3. 2

Radio noise reduction filter

It is effective for electrical interference to audio equipment, etc. used near the inverter.
■ High-attenuation radio noise reduction filter
• It is a LC filter installed on the input side of the inverter.
• It has a wide attenuation characteristic from AM radio band range to around 10 MHz.
• It is used when equipment susceptible to surrounding noise is installed.
■ Zero-phase reactor
• It is an inductive filter.
• It is effective for noise reduction for both input side and output side of the inverter.
• It has an attenuation characteristic of several dB from AM radio band range to10 MHz frequency
band.
10. 3. 3

EMC filter

When installing an EMC filter and wire properly, it can comply with EMC Directive.
480 V model of the inverter has the built-in EMC filter as standard; however, if an EMC filter is added
externally, noise reduction becomes more effective. Please contact your Toshiba distributor for details.
10. 3. 4

Braking resistor, Braking unit

It is a resistor to consume regenerative energy from a motor.
When making frequent rapid deceleration and stop, it is used to shorten deceleration time with load in
large inertia.
A braking unit is necessary in addition to a braking resistor for the frame size A6 and A8.
For details on using a braking resistor, refer to [6. 15. 4].
10. 3. 5 Motor-end surge voltage suppression filter
When operating a 480 V class general purpose motor with a voltage type PWM control inverter that
uses high speed switching element (IGBT, etc.), surge voltage exceeding the insulation level of motor
winding is generated depending on power supply voltage, motor wire length and its laying method, and
type. When the condition is repeatedly applied for a long time, it may cause deterioration of insulation
on the motor.
Such measures as installation of an AC reactor, surge voltage suppression filter, sinusoidal filter on the
inverter output side (secondary side), and use of a high insulation strength motor are necessity.
When using a sinusoidal filter, set the carrier frequency to 4.0 to 8.0 kHz.
For details of carrier frequency, refer to [6. 14].
10. 3. 6 Optional control power supply
This inverter supplies control power supply from the power supply inside the inverter. When control
power supply is backed up with this option, display and output signal can be maintained in case of
power supply shut off.
• It is common with 240 V/480 V class.
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10. Selection and installation of peripheral devices
E6582062
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