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© 2018 Emerson Climate Technologies, Inc.
AEX-XXXX
PRELIMINARY
AE8-1384 R6
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 flash 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
configured 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 flash 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 configurable 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 flash 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.
Code 7 - Reverse Phase
The module will flash 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 flash the red
Alert
LED nine times
indicating low module voltage (see
Table 2
) on the T2-
T1 terminals for more than 5 seconds. A Code9
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.
Power Up Delay
When CoreSense Communications is cycled off, there
is a thirteen to fifteen second delay before the module is
active.
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
flashing 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 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 Modbus has six message
categories:
1. Device ID Messages
2. CoreSense Status Messages
