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© 2011 Emerson Climate Technologies
Printed in the U.S.A.
AE8-1384 R1
Application Engineering
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Once the module has locked out the compressor,
a power cycle or Modbus reset command will be
required to clear the lockout.
Code 3 – Short Cycling
The module will
fl
ash the red
Alert
LED three times
indicating the compressor is locked out due to short
cycling. A Code 3
Alert
will open the M2-M1 contacts.
Code 3 will be enabled when the "Short Cycling"
dipswitch (#10) is "on" or in the "up" position and the
compressor has exceeded the number of short cycles
con
fi
gured by the user in a 24 hour period. Once the
module has locked out the compressor, a power cycle
or Modbus reset command will be required to clear
the lockout.
Code 4 – Scroll High Temperature
The module will
fl
ash the red
Alert
LED four times
indicating the scroll NTC circuit is less than 2.4K
Ohms. A Code 4
Alert
will open the M2-M1 contacts.
The
Alert
will reset after 30 minutes and the M2-
M1 contacts will close if the resistance of the scroll
NTC circuit is higher than 5.1K Ohms. The module
will lockout the compressor if the number of Code
4
Alerts
exceeds the user con
fi
gurable number of
Code 4 events within a 24 hour period. Once the
module has locked out the compressor, a power cycle
or Modbus reset command will be required to clear
the lockout.
Code 5 – Reserved for Future Use
Code 6 – Missing Phase
The module will
fl
ash the red
Alert
LED six times
indicating a missing phase in one of the three leads
to the compressor. A Code 6
Alert
will open the M2-
M1 contacts. The
Alert
will reset after 5 minutes and
the M2-M1 contacts will close if the missing phase
condition is not present. The module will lockout the
compressor after 10 consecutive Code 6
Alerts
.
Once the module has locked out the compressor,
a power cycle or Modbus reset command will be
required to clear the lockout.
Code 7 – Reverse Phase
The module will
fl
ash the red
Alert
LED seven times
indicating a reverse phase in two of the three leads
to the compressor. A Code 7
Alert
will open the M2-
M1 contacts. The module will lockout the compressor
after one Code 7
Alert
. A power cycle or Modbus
reset command will be required to clear the lockout.
Code 8 – Reserved For Future Use
Code 9 – Module Low Voltage
The module will
fl
ash the red
Alert
LED nine times
indicating low module voltage (see
Table 2
) on the
T2-T1 terminals for more than 5 seconds. A Code
9
Alert
will open the M2-M1 contacts. The
Alert
will
reset after 5 minutes and the M2-M1 contacts will
close if the T2-T1 voltage is above the reset value
in
Table 2
.
Please see
Table 6
for a summary of
Warning
and
Alert
codes and troubleshooting information.
Resetting Alert Codes
Resetting
Alert
codes can be accomplished in two
different ways. First,
Alert
codes can be reset manually
by cycling power to the module (disconnect T2 or T1
for 5 seconds). The second way to reset
Alert
codes
is to send a Modbus reset command from the master
controller.
If the fault that initiated the
Alert
code is absent after
one of the above resets is performed, the
Alert
code will
be cleared and CoreSense will allow normal operation.
If the fault is still present after the reset is performed the
fault code will continue to be displayed via the green
or red
fl
ashing LED.
COMMISSIONING
Communications
Programming knowledge and a familiarity with
Modbus will be required by the system designer
to use the communications features of CoreSense
Communications. CoreSense Communications
has opto-isolated RS485 for the physical layer. The
communication protocol is Standard Modbus and
Emerson Climate Technologies Modbus. CoreSense
Communications will act as the Modbus slave, while
the master will be implemented in a system controller,
PC software, or any other equivalent external device.
Use of the communications feature of CoreSense
Communications allows the master access to much of
the data that resides in the CoreSense Communications
module. Emerson Climate Technologies Modbus has
six message categories:
1. Device ID Messages
2. CoreSense Status Messages
3. CoreSense History Status Messages
4. Con
fi
guration Messages
5. Command
Messages
6. Firmware Update Messages
CoreSense status, con
fi
guration, history, and device
information messages available to the master include
those listed in
Table 4
.
