Appendix D: Optional equipment
66
SC9000 EP medium voltage drives
IB020001EN—February 2016
www.eaton.com
Troubleshooting
The dV/dt filter includes reactor thermal switches. When a
dV/dt Filter is included in the SC9000 EP, these sensors
connect to the SC9000 EP I/O and the drive application is
programmed to monitor them. Detection of a thermal switch
opening causes a drive shutdown and a fault message to be
displayed and recorded.
Replacement parts
Table 15
shows replacement part numbers.
Table 15. Replacement parts
O&M technical references
For additional information about the SC9000 EP, refer to this
SC9000 EP User Manual, IB02004001E.
Section 3: Sine filter
Sine filter definition
A sine filter is an SC9000 EP system element designed to
reduce Total Harmonic Distortion of the output. Total
Harmonic Distortion, or THD, is a measurement of the
amount the addition of other frequency waves corrupts a
wave shape. THD measures the power quality of electric
power systems.
Unlike the dV/dt filter, which works to reduce high-frequency
drive output components, the sine filter reduces specific
lower-frequency harmonics to produce a more sinusoidal
drive output voltage and current.
Reducing Total Harmonic Distortion of the voltage and
current delivered to a motor can decrease heating and
increase efficiency. Harmonics, if present, will increase
the electrical losses, and increase motor heating.
Sine filter purpose
The SC9000 EP sine filter design reduces the drive output
THD to less than 5% on both output voltage and current, for
loads above 30% of rated. Although its purpose is harmonic
distortion reduction, the sine filter will also reduce the drive
output dV/dt.
With the sine filter applied, the only limitation on connecting
cable lengths is the voltage drop between the drive and
the motor.
Sine filter design
The SC9000 EP sine filter is composed of inductors,
capacitors and resistors. The inductors and capacitors
assemblies include protective sensing devices.
Figure 61
shows a representative sine filter diagram.
Figure 61. Typical sine filter elementary diagram
Representative sine filter performance
Figure 62
shows an example of SC9000 EP output
performance without and with the Sine Filter.
Figure 62. Example before and after sine filter output
Part number
Description
W2E250-HJ32-0
Fan, WE250, 1P, 115V, 60HZ, 50C C
478C779H01
Intake filter
Contact Eaton for
project-specific part
Reactor (includes thermal switch and thermal
sensor)
Summary of Contents for SC9000 EP
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