Specifications

13
© 2012 Emerson Climate Technologies, Inc.
Printed in the U.S.A.
AE8-1368 R2
1. Press F2 (Next Tab) until the Stage Setup screen
is displayed.
2. Under Type, select Comp for compressor, Unld
for unloader, or Dgtl for digital.
3. Under Capacity, enter the compressor capacity in
BTU/hr or the compressor horsepower for each
stage. The E2 will use this value as the expected
output for each stage and w ill cycle the stages
according to the required demand.
Note: For a compressor equipped with an unloader
(blocked suction or Moduload, but NOT digital) the
horsepower should be divided between the compressor
and unloader stages. A compressor with an unloader
can be considered to be two different compressors
from a control standpoint. When the suction group
status screen shows the unloader to be “OFF” and
the comp (compressor) to be “ON’, the compressor
is running “unloaded”, i.e. the unloaded portion of
the compressor is not contributing to generation of
capacity. If the comp and unloader are both “ON”, the
compressor is running at full capacity.
When these steps have been completed, the
compressor setup screen(s) should look like Figure
4.8.
4.4 Associations
In order the provide compressor control, each
CoreSense Diagnostics device must be associated
with its appropriate suction group. To make these
associations, follow these steps:
1. From the main menu select 7 (System
Confi guration)
2. Press 7 (Network Setup)
3. Press 4 (Controller Associations)
4. Press 4 (Compressor)
The E2 should look like Figure 4.9.
Enter the appropriate stage numbers. The example in
Figure 4.9 shows fi ve compressors with a selection of
standard, blocked suction and digital unloading.
4.5 Proofi ng
Also located on the Compressor Association Screen
are the settings for compressor proofi ng. Proofi ng
verifi es that the compressors are turning ON and OFF
as commanded by the suction group requirements.
With proofi ng enabled the rack controller compares the
digital command sent to the CoreSense Diagnostics
module with a digital output from the module. If the
Figure 4.9
Compressor Association Screen
two values are not equal for an amount of time longer
than the programmed proof delay, the rack controller will
display a Proof Fail condition for that module. The rack
controller will deactivate the Proof Fail once the module
proofi ng output matches the command from the E2.
To confi gure proofi ng simply highlight the appropriate
cell under the Proof column. Use the Previous/Next
buttons on the E2 to toggle between the YES and NO
settings. The rack controller will make the necessary
associations between the module and suction group.
4.6 Failsafe
The compressor failsafe mode may be confi gured by
setting the number 10 DIP switch located on each
CoreSense Diagnostics control module. With the switch
in the up position the compressor will be set for failsafe
ON in the event that communications with the rack
controller is lost for 5 or more minutes. If the switch is in
the down position the compressor will be set for failsafe
OFF. Keep in mind that once a DIP switch setting is
changed, a reset of the control module is required
for the control module to recognize the change.
The default setting for all Copeland Discus
compressors with CoreSense Diagnostics leaving the
factory is failsafe “ON”. If the rack has not yet been
commissioned, system charging may be accomplished
by supplying pilot circuit power to the compressor with
the rack controller OFF. After 5 minutes the CoreSense
Diagnostics module will send a run command to the
contactor/pilot relay. Compressors with power to the
contactors will then RUN with protection features in
place (e.g. suction and discharge pressure, discharge
temperature, motor protection).