Specifications

3
© 2012 Emerson Climate Technologies, Inc.
Printed in the U.S.A.
AE8-1368 R2
As with all conditions, the status of the compressor and
the display code are transmitted to the rack controller
where they may be viewed.
The status codes are discussed below in Section 6.0.
Troubleshooting fl owcharts to assist with resolution of
each of the warnings, trips and lockouts may also be
found in Section 6.0.
1.1.2 Communications
Communication between the rack controller and each
CoreSense Diagnostics module is through an RS485
network with MODBUS. The two-wire communication
cable is daisy-chained from one compressor to the
next on each rack.
Compressor operations such as on/off control,
modulation operation, transmission of compressor
status and run proofi ng are all accomplished through
the communication network. Password protected
remote reset of certain compressor lockouts may also
be done through the communication network if this
functionality has been enabled through the controller.
Capacity modulation functions are discussed in detail
in Section 1.3, and in Commissioning / Suction Group
Setup Section 4.3.
The Emerson Retail Solutions’ controller E2, version
2.6 or higher, may be confi gured to send alarms
for different levels of compressor faults, such as for
warnings, trips and lockouts.
The Failsafe mode may be confi gured to turn the
compressor on or off in the event of a communications
failure. This confi guration is accomplished via a
dipswitch setting inside the lower cover of the control
module.
1.1.3 Fault History
The 10 most recent warnings, trips or lockouts may
be observed through the E2 alarm history screen. An
8 –day log of each fault is also available as well as an
accumulated record for the history of the compressor.
Graphing features available with the E2 controller
provide a powerful diagnostics tool to help understand
the source of system or compressor faults. Date
and time stamping of faults and alarms can help to
associate the fault with system events (such as defrost
cycles).
Like previous versions of Intelligent Store Discus, the
CoreSense Diagnostics module will store the fault
history record.
1.2 Features
1.2.1 Compressor Protection
Compressor protection may be in the form of a TRIP,
where the compressor will be shut off until the fault
condition no longer exists (and in some cases a
minimum off-time is satisfi ed), or a LOCKOUT. A
LOCKOUT is a condition whereby the compressor will
remain off until the fault condition no longer exists AND
the manual reset button is pushed (or power to the
control module is cycled). Lockouts may also be reset
from the E2 or remotely through Site Manager, including
oil pressure if remote re-set has been enabled for this
fault (this is password protected). A WARNING is a
fault that doesn’t keep the compressor from running
(an example is an open or shorted unloader coil).
The following compressor protection features are
provided on all Copeland Discus compressors with
CoreSense Diagnostics:
• High discharge pressure
• Low suction pressure
• Discharge temperature
• Line-break motor protection (2D / 3D)
• Motor temperature protection (CoreSense
Diagnostics replaces the solid-state module used
on 4D / 6D compressors)
• Low voltage
• Power interrupt motor protection
• Welded contactor protection
• Loss of phase motor protection
• Low oil pressure (CoreSense Diagnostics
replaces the Copeland
™
brand Sentronic+
™
oil
pressure protection modules).
• Part winding start failure
• Locked rotor and settable MCC protection
• Shorted unloader coil protection
• Shorted contactor or pilot relay coil protection
The following options are available with Copeland
Discus compressors with CoreSense Diagnostics:
• Crank case heater control
• Blocked suction modulation (4D/6D compressors)
• Discus Digital™ capacity modulation (3D/4D/ 6D)
Note: The conventional blocked suction or
Moduload valving MAY NOT be activated
to perform in a digital fashion. These valve
mechanisms have not been designed to
work reliably in a digital fashion. Only use
this feature with Discus Digital™ modulation
hardware.