Application Engineering
B U L L E T I N
AE8-1386 R1
INTRODUCTION
The XC643CX is designed to manage one Copeland
™
digital compressor on a single-compressor condensing
unit, or two compressors in parallel, with one digital
compressor in addition to a fixed-speed compressor.
The controller also manages condenser fans. Control
is based on the pressure or temperature sensed in the
low pressure suction (compressors) and high pressure
(condenser) circuits.
The front panel offers information on the system status,
the status of loads, and any alarm conditions. The
controller can be easily programmed through a hot key.
The controller can be connected to a monitoring system
via the serial TTL output, using the standard ModBus
RTU protocol.
Overview
On refrigeration applications where the load may vary
over a wide range, some means of capacity control is
often desirable for optimum system performance and
control. In addition, compressor capacity modulation
can reduce power and energy consumption, reduce
Table 1 - Modulation Ranges
Modulation Range
Compressor Family of Full Load
Capacity
Scroll Digital ZBD/ZRD/ZFD/ZPD 10-100%
3D Discus Digital 10-100%
4D Discus Digital 55-100%
6D Discus Digital 70-100%
compressor cycling, and decrease the starting
electrical load. In order to achieve these objectives,
Emerson Climate Technologies has developed the
Copeland Discus
Digital
™
and Copeland Scroll Digital
™
compressors.
The XC643 is one module (one part number) which
can support scroll and Discus digital (3D, 4D, 6D)
compressors. See Table 1 for specific modulation
ranges.
For more details on Copeland digital compressors refer
to the following Application Engineering guidelines
or contact your Emerson Climate Technologies
representative:
AE21-1319, Digital Capacity Control for Refrigeration
Scroll Compressors
AE21-1355, Digital Capacity Control for Copeland and
Intelligent Store Discus Refrigeration Compressors
AE4-1357, Upgrade Procedures for Parallel Applications
Using Digital Capacity Control for Copeland and
Intelligent Store Discus Refrigeration Compressors (for
3D Discus)
AE4-1373, Upgrade Procedures for Parallel Applications
Using Digital Capacity Control for Copeland and
Intelligent Store Discus Refrigeration Compressors (for
4D & 6D Discus)
The simplest way to apply the XC643 digital controller
is with one suction pressure transducer or evaporator
temperature sensor. The controller reads the suction
pressure and modulates the digital compressor as
Table 2 - Product Specifications
Housing: Self extinguishing ABS.
Case: Front panel 32x74 mm (1.26x2.91 inch), depth 70mm (2.76 inch)
Mounting: “CX” format panel mounting in a 29x71 mm panel cut-out (1.14x2.80 inch)
Protection: IP20
Frontal protection: IP65
Connections: Removable terminal block 6 and 14 wires
Power supply: 24Vac/dc * 10%, 50-60Hz.
Power absorption: 5VA max
Display: 4 digits red led and 4 digit orange led.
Serial output : TTL standard Communication protocol: ModBus - RTU
Operating temperature: -28 to +60°C (-20 to +140F); Storage temperature: -25-60°C (-13-140F)
Relative humidity: 20-85% (no condensing)
© 2013 Emerson Climate Technologies, Inc.
4
Printed in the U.S.A.
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