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agility
TM
Series Soft Start User Manual
MAN-AGY-001. Version 04. 21/09/2018
Only non-triplen (integer multiples of the third harmonic), odd harmonic frequencies are created,
starting with and diminishing rapidly from the fifth harmonic, and virtually disappearing by the
nineteenth harmonic.
Emissions - Radio Frequency (RF)
Radio frequency emissions are propagated in two ways:
a)
Conduction along the leads supplying the soft starter.
b)
Radiation from the operating equipment.
They also have two sources:
1)
The high-frequency currents associated with the control electronics (this includes the
microprocessor).
2)
The action of the semiconductor devices forming the power switching elements located in
the controller main circuits.
The radiation measurements made from operating versions of agility
TM
Soft Starters show levels
lower than the allowed limits. Further, enclosures of metallic construction provide additional
shielding for agility
TM
Soft Starters mounted within them. The only radiated interference effect
that might arise from a soft starter would be if mobile telephones, walkie-talkies, etc. were to be
used in very close proximity to a unit which was operating with the enclosure door open. For this
reason, any enclosure must display a label that brings the possibility of electromagnetic
interference to the attention of the operator under these circumstances.
Emissions - Conducted
Conducted emissions are able to travel great distances and may cause interference to any
neighboring consumers connected to the common low-voltage supply network.
Allowable levels for conducted emissions generated by semiconductor motor controllers and
starters are influenced by the nature of the low-voltage power distribution network. The
determining factor is whether the source of power is, either:
a)
a private supply with a single consumer whose Point of Common Coupling (PCC)
is at a high or medium voltage transformer, or
b)
a public low-voltage network with more than one consumer, where the individual
PCC is made directly to the network itself.
The first type of supply (a) is identified as “Industrial”, and requires the use of soft starters
compliant with EN 60947-4-2 Table 19 Environment A Emission Levels.
The second type of supply (b) is identified
as “Residential” and requires the use of Class B
equipment. Class B equipment is equipment suitable for use in domestic establishments and in
establishments directly connected to a low-voltage power supply network which supplies
buildings for domestic purposes.
Important Systems Information
The specification limits for both equipment classes assume systems are grounded at the star
(wye) point of the supply transformer through low impedance connections.
Certain industries, particularly continuous process industries, employ distribution systems that
operate either with a ground connection through a high impedance or without a ground at all.
These systems may cause severe problems of operator safety when installed with capacitive high
frequency filters. Such systems are not considered in this document.