General Information
14
AFDJ-SVU01D-EN
About the AFDJ Drive
The AFDJ Trane Adaptive Frequency Drive is an air-cooled
drive which utilizes Pulse Width Modulation (PWM) high
switching frequency Symmetric Gate Commutated
Thyristors (SGCT). Both the inverter and the rectifier use
SGCTs, and both operate at optimal switching frequency
to minimize the switching losses. These SGCTs are an
integration of the power semiconductor and the gate
driver electronics. The close proximity of the gate driver
and power semiconductor provides a superior switching
pattern that prevents the drive from producing high levels
of line current harmonics and minimizes snubber
requirements. The Total Harmonic Distortion (THD) of the
input current is within IEEE-519 harmonic guidelines. Both
current and voltage waveforms are near sinusoidal,
reducing stress on the motor windings.
A combination of two distinct operating modes make up
the control within the chiller’s UC800 control: first, by
controlling the inlet guide vanes and second, by
modulating the impeller speed from 38–60 hertz. The drive
controls the speed in response to the UC800 compressor
control signal.
The CenTraVac control panel has full control of unit
operation, including the start and stop functions. If a fault
condition is encountered, or an alarm on the drive, the
Tracer AdaptiView display will indicate “alarm” and an
“Alarm message”.
Other Features
•
Totally isolated low voltage and medium voltage
compartments.
•
Mechanical and electrical interlocks between the drive
and input disconnecting means.
•
Double offset ventilation pattern on the drive doors to
ensure operator safety.
•
Input Voltage Tolerance: ±10% of Nominal Line Voltage
•
Input Frequency: 50/60 Hz, ±10%
•
Output Voltage Rating: 0–2300, 0–3300, 0–4160, 0–6600
•
Input Protection: Metal Oxide Varistors
•
Control Method: Sensorless Direct Vector (Full Vector
Control Optional)
•
Ambient Temperature: 32°F–104°F (0°C– 40°C)
•
Cooling: Forced Air
•
Relative Humidity: 95% Non-condensing
•
Altitude: 3300 feet (1000 m) above sea level without
derating.
Drive Identification
The drive has a Trane model number and a Rockwell series
number. Both these are extremely important when
identifying the drive for service or parts. Refer to
for more information about the Trane
model number.
The Rockwell series number is shown on the Rockwell
drive nameplate (see
), which is located on the
outside of the drive enclosure. This series number should
be available for reference in any correspondence with
Trane and/or Rockwell. The chiller series number and
chiller sales order number should also be available for
reference.
Figure 1.
Example: MV Rockwell drive nameplate
Note:
This 700XXXX-XXX-XX number identifies the drive. Always
have this number ready when service is required.
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