Specifications

5
© 2012 Emerson Climate Technologies, Inc.
Printed in the U.S.A.
AE8-1368 R2
Digital modulation will be available for the 3D, 4D and
6D compressor. The E2 can control any combination
of compressors, blocked suction compressors and/
or digital compressors. When more than one digital
compressor is in a suction group, only one compressor
at any given time will be operating in a “digital” mode
(i.e. modulating in a pulse-width fashion).
Blocked suction (and Moduload) compressors are set
up in the suction group as stages (i.e. the compressor
is one stage and each unloader is one stage). The total
output of the compressor (horsepower or capacity)
is the sum output of each individual stage. When
an unloader stage is “on” it is producing capacity
(this is when the solenoid is de-activated, or “off”). If
you override an unloader stage “off”, the solenoid is
energized.
When setting up the suction group using Digital
compressors, the compressor is one stage (regardless
of the number of unloaders). A 3D Digital, 4D Digital,
6D Digital with one unloader or a 6D Digital with 2
unloaders are all confi gured as one stage.
The digital control cycle is by default a 20 second
period. Within this period the output of the compressor
will be pulsed to produce (on average) the capacity
requested by the controller. The advantages of Digital
control are signifi cant:
• Dramatically reduced compressor contactor
cycling
• Tighter control of pressure or temperature
• Reduced set-point error
Refer to Figure 1.2 for a comparison between the
modulation control requirements with and without
CoreSense Diagnostics v2.11. The conventional
control arrangement that is depicted shows a
compressor without modulation, a compressor with
conventional blocked suction modulation and one with
Digital modulation.
1.4 Application Restrictions
Variable Speed – CoreSense Diagnostics v2.11 is not
approved for use with variable speed drives. Other
devices on the rack may use variable speed, but
the compressor itself may not be modulated with an
inverter.
Demand Cooling – The Copeland Discus compressor
with CoreSense Diagnostics is equipped with Demand
Cooling capability, and as such may be used as an
R407A / R407C low temperature compressor.
For proper Demand Cooling control, the following
fi rmware versions are required: control module -
1.30F05 or later, sensor module - 2.00F03 or later.
Low Temperature Operation – The CoreSense
Diagnostics electronics are designed to operate
between -25°F and 150°F. At temperatures below 0°F
the LCD display may be “slow”, but the compressor
status information in the E2 is up-to-date.
2.0 Installation Instructions
Emerson Climate Technologies requires that all
customers review the recommended guidelines in
the published Application Engineering Bulletins, and
ensure that best engineering practices are followed
in the use of Copeland
™
compressors. Emerson
Application Engineering Bulletins can be found on our
website, www.EmersonClimate.com under the section
titled “Online Product Information." The advice and
conclusion by Emerson represents our best judgment
under the circumstances, but such advice given and/or
conclusion made, or results obtained shall be deemed
used at your sole risk.
Modulation Control - CoreSense Diagnostics v2.11
Modulation Control w/o CoreSense Diagnostics
RS 485
Communication
IDCM Module
Figure 1.2 – Modulation Control