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INTRODUCTION
This bulletin provides instructions on how to apply a
Copeland Scroll
variable speed compressor in a safe
™
and reliable manner. The Copeland Scroll variable
speed compressor will be referred to throughout this
bulletin as the 'variable speed scroll' or the 'compressor.'
Product Description
The ZPV063 variable speed compressor has a speed
range of 1000 (refer to operating envelope for low
speed operation) to 7200 revolutions per minute and
is intended for use in commercial air conditioning,
chiller, and heat pump applications. The variable speed
scrolls utilize three-phase brushless permanent magnet
(BPM) motors. The compressors have been qualified
for use with Emerson
EVC1 Drives which have been
™
developed and qualified for BPM motor-compressors.
The Emerson drives offer the highest level of compressor
protection through the use of CoreSense
algorithms. If use of a non-Emerson drive is desired,
please work with Application Engineering to select an
appropriate drive for the compressor application. See
Third Party Drive requirements on the following page.
Compressor Data
Compressor drawings, mechanical, electrical,
and performance data are available by contacting
Application Engineering.
Locked Rotor Current (LRA):
LRA is defined as the highest current input to the
MOTOR when the compressor is in a mechanically
locked condition. The LRA for the variable speed
scrolls will be much lower than the LRA values for
fixed capacity scrolls. The variable speed scroll is
started at a much lower frequency and voltage and
the result is the elimination of very high inrush current.
Rated Load Amps (RLA):
An electrical value that is used by the system designer
to size overcurrent protection devices and current
carrying conductors. RLA = MCC/1.4
Max Operating Current:
The maximum input current to the drive at nominal
voltage when the compressor is running inside any
one of the operating envelopes at the speed range
designated for that envelope.
Please refer to Table 1 for more technical data for the
compressor.
© 2016 Emerson Climate Technologies, Inc.
Power Supply
The compressor and drive are an integral and optimized
combination. The drive will convert the input voltage
into a variable frequency and voltage to power the
compressor. For more information on the drive power
input requirements please see the Emerson EVC1 Drive
user guide.
CAUTION
The variable speed compressor must be paired
with the appropriate variable speed drive. Do
not connect the power supply directly to the
compressor.
Nomenclature
The model number of the variable speed scroll includes
the approximate displacement in cubic centimeters per
revolution. Figure 1 provides a complete explanation
protection
™
of all of the alpha and numeric characters in the
compressor model number.
Agency Approval
The ZPV063 compressors are U.L. recognized in file
SA2337, Volume 22. When the compressor is used with
the Emerson EVC1, the compressor and drive are a
U.L. listed 508C package. The package is listed in file
SA2337, Volume 22.
OEM LAB TESTING
Application Engineering should be consulted during
the design, development, and production launch of the
variable speed system to help ensure that the variable
speed scroll is applied as intended, in a safe and reliable
manner.
Modeling System Performance
Modeling at any speed in the 1,000 to 7,200 range and
in any approved envelope is facilitated by 20 coefficient
data available from Application Engineering.
COMPRESSOR DESIGN FEATURES
The variable speed scroll has a number of design
features that improve efficiency and reliability. Figure
8 shows the internal features that are unique to the
variable speed scroll.
Compressor Motor
The brushless permanent magnet (BPM) motor in the
variable speed scroll consists of a three-phase stator
4
AE4-1402 R4
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