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Altivar
®
58 TRX AC Drives
Line Reactors and Output Filters
39
09/2003
© 2000–2003 Schneider Electric All Rights Reserved
Wiring systems with a neutral connected directly to ground can be classified in two ways, as TT or TN.
1. TT indicates a neutral wire connected directly to ground. The exposed conductive parts of the
product are connected to ground via a separate path.
2. TN indicates a neutral wire connected directly to ground and the exposed conductive parts of the
product are connected to ground via the same path.
Wiring systems grounded through a high impedance or systems with an isolated (floating) neutral can
be referred to as IT. Standard IEC 1800-3, appendix D2.1, states that filters must not be used with IT
mains supplies because they prevent the ground leakage detectors from working reliably. In addition,
the effectiveness of the filters on IT mains supplies depends on the type of impedance between neutral
and earth, and is therefore not recommended.
In the case of a machine which must be installed on an IT supply, the solution is to insert an isolation
transformer and operate the machine locally using a TN or TT supply.
Refer to page 125 for dimensions and to page 132 for selection.
LINE REACTORS
Line reactors can improve protection against line overvoltage surges and reduce input currents to the
drive controller by adding impedance. The additional impedance also reduces the harmonic current
distortion produced by a typical 6-pulse diode rectifier used to convert AC to DC in most drive
controllers. Additional impedance is recommended when the impedance of the power distribution
system is low, such as when the power rating of the system transformer is ten times larger than the
power rating of the drive controller. Single-phase line reactors are available for single-phase input rated
ATV58 TRX Type H drive controllers. See pages 125, 132, and 133 for dimensions and selection.
MOTOR PROTECTING OUTPUT FILTERS
The motor protecting output filters combine inductance, capacitance, and resistance to form a low pass
filter. They should be considered for use in applications where the wiring to the motor(s) is longer than
100 ft. (30.5 m). These filters lower the dv/dt levels to prevent exciting the natural resonant frequency of
the output circuit (drive controller, motor cables, and motor). Motors compliant to NEMA MG1, Part 31
guidelines generally do not require the use of motor protecting filters. See page 133 for dimensions and
selection.
Characteristics
Conformity to standards
EN 133200
Degree of protection
IP 21 and IP 41 on upper part
Maximum relative
humidity
93% with no condensation or dripping water, conforming to IEC 68-2-3
Ambient air temperature
Operation –10 to 60 °C (14 to 140 °F)
Storage –25 to 70 °C (–13 to 158 °F)
Operating altitude
Up to 1000 m (3280 feet) No derating required
Above 1000 m (3280 feet) Derate the current by 1% for each additional 100 m (328 feet)
Maximum nominal voltage
50/60 Hz single-phase 240 Vac +10%
50/60 Hz 3-phase 500 Vac +10%