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© 2018 Emerson Climate Technologies, Inc.
AEX-XXXX
PRELIMINARY
AE8-1384 R6
NOTICE
CAUTION
WARNING
M2-M1:
Normally open control circuit contacts; M2-M1
should be wired in series with the compressor contactor.
A (+), GND, B (-)
: RS485 communications.
Temperature Plug
: See
Figure 3
for identification of the
PTC, NTC, and common connections.
When multiple CoreSense Communications modules are
networked, a shielded, twisted pair cable such as Belden
#8761 (22 AWG) should be used for the communication
wiring.
The RS485 is polarity sensitive. When “daisy
chaining” modules the A (+) must connect to other
A (+) terminals and B (-) must connect to other B (-)
terminals.
Dielectric (Hipot) Testing
Use caution with high voltage and never hipot when
compressor is in a vacuum.
U.L. sets the requirement for dielectric strength testing
and should be consulted for the appropriate voltage and
leakage values. Emerson Climate Technologies does not
recommend hipot testing at voltages higher than 1,000
VAC.
OPERATION
The CoreSense Communications module is a
recognized safety device and must be used with all
compressors that have TE* electrical codes.
A solid green LED indicates the module is powered and
operation is normal. A solid red LED indicates an internal
problem with the module. See the
Troubleshooting
section of this bulletin for more information on what to do if
the red LED is solid.
CoreSense Communications communicates
Warning
codes via a green flashing LED. Warning codes do not
result in a trip or lockout condition.
Alert
codes are
communicated via a red flashing LED. Alert codes
will result in a trip condition and possibly a lockout
condition.
Warning Codes (Green LED Flash Code)
Code 1 - Loss of Communication
The module will flash the green
Warning
LED one
time indicating the module has not communicated
with the master controller for longer than 5 minutes.
Once communication is reinitiated, the
Warning
will
be cleared.
Code 2 - Reserved For Future Use
Code 3 - Short Cycling
The module will flash the green
Warning
LED three times
indicating the compressor has short cycled more than 48
times in 24 hours. A short cycle is defined as compressor
runtime of less than 3 minutes. The
Warning
will be
activated when the “Short Cycling” dipswitch (#10) is
“off” or in the “down” position. When fewer than 48 short
cycles are accumulated in 24 hours the
Warning
code
will be cleared.
Code 4 - Open/Shorted Scroll Thermistor
The module will flash the green
Warning
LED four times
indicating the scroll NTC thermistor has a resistance
value that indicates an open/shorted thermistor (see
Table 2
). The
Warning
will be cleared when the
resistance value is in the normal range.
Alert/Lockout Codes (Red LED Flash Code)
Code 1 - Motor High Temperature
The module will flash the red
Alert
LED one time
indicating the motor PTC circuit has exceeded 4.5K
Ohms ± 25%. A code 1
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 motor
PTC circuit is below 2.75K Ohms. Five consecutive
Code 1
Alerts
will lockout the compressor. Once the
module has locked out the compressor, a power cycle or
Modbus reset command will be required for the lockout
to be cleared.
Code 2 - Open/Shorted Motor Thermistor
The module will flash the red
Alert
LED two times
indicating the motor PTC thermistor circuit has a
resistance value that indicates an open/shorted
thermistor chain (see
Table 2
). A Code 2 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 motor PTC circuit is back in the
normal range. The module will lockout the compressor
if the trip condition exists for longer than 6 hours
WARNING
CAUTION
NOTICE
