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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 Beldon #8761 (22 AWG) should be used for the
communication wiring.
NOTICE
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
CAUTION
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
WARNING
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.
© 2016 Emerson Climate Technologies, Inc.
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.
5
AE8-1384 R5
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