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Appendix D: Optional equipment
Section 1: Introduction
Purpose
This user manual addendum covers the installation,
operation, and maintenance of selected SC9000 EP medium
voltage adjustable frequency drive optional equipment. It
does not cover all possible contingencies, variations, and
details that may arise during installation, operation, and
maintenance of this equipment.
The SC9000 EP can be equipped with several optional
features. This addendum addresses these features:
dV/dt filter
●
Sine filter
●
Synchronous transfer
●
Synchronous motor control
●
High voltage input
●
Bypass control
●
Optional features summary
dV/dt filter
Standard induction motors driven by adjustable frequency
drives can experience excessive induced voltages at the
motor under certain cable length conditions. An SC9000 EP
dV/dt filter, selected for the motor's ratings and cable length,
reduces these voltages, and makes longer cable runs
possible with satisfactory operation.
Inverter-duty motors driven by adjustable frequency drives
also can experience excessive induced voltages at the motor
if cable length is excessive. For inverter-duty motors, the
circumstances when these voltages occur are different, but
an SC9000 EP dV/dt filter also addresses these conditions.
Sine filter
Total Harmonic Distortion, or THD, is a measurement of the
amount the addition of other frequency waves corrupts a
wave shape.
The SC9000 EP sine filter design reduces the drive output
THD to less than 5% on both output voltage and current.
Although its purpose is harmonic distortion reduction, the
sine filter will also reduce the drive output dV/dt to less than
10 volts per microsecond.
Synchronous transfer system
With additional equipment, the SC9000 EP can provide
synchronous transfer control to a multiple-motor system.
For any number of motors, this system individually starts and
accelerates each motor, matches its voltage, frequency and
phase angle to a utility power bus, and transfers the motor
from the SC9000 EP to the utility bus. In addition, the
synchronous transfer system can transfer any connected
motor's power source from the utility bus back to the
SC9000 EP and run or stop it.
Synchronous motor control
The SC9000 EP adjustable frequency drive can power
synchronous motors. Additional power and control
components power the motor's rotor field.
While the Ampgard motor control product line offers four
different versions of synchronous motor field excitation for
motor starters, the SC9000 EP offers synchronous motor
field control for AC brushless and DC brush fields.
High voltage input
The SC9000 EP can deliver 2400 V, 3300 V or 4160 V
output voltages, and can accommodate input voltages
between 2.4 kV and 13.8 kV. When input voltages above
6.9 kV are required, the SC9000 EP is equipped with an
additional 72-inch wide cabinet to incorporate a 95 kV BIL
incoming line and a 15 kV input contactor.
Bypass system
The Ampgard system offers two systems for bypass control:
full voltage bypass and Reduced Voltage Solid State bypass.
Full voltage bypass serves as a backup to the SC9000 EP
AFD and can run a connected using a full voltage starter
while the AFD is down.
RVSS bypass starts the connected motor using a
reduced-voltage solid-state starter technology while
the AFD is down.
Refer to the specific order drawings supplied with your
drive system for details on which devices are part of
your equipment.
Documentation reference
For further information on installation and application, refer to
the applicable technical data, publications, and/or industry
standards. Download Eaton electronic information from
www.eaton.com.
Eaton contact information
For the location of your nearest Eaton sales office or
distributor, call toll-free 1-800-525-2000 or log on to
www.eaton.com. Eaton's Engineering Services & Systems
(EESS) can be reached at 1-800-498-2678.
SC9000 EP medium voltage drives IB020001EN—February 2016 www.eaton.com
Appendix D: Optional equipment
61
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