5
© 2011 Emerson Climate Technologies
Printed in the U.S.A.
AE8-1384 R1
Application Engineering
B
U
L
L
E
T
I
N
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 4
for identi
fi
cation 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
fl
ashing LED. Warning codes do not
result in a trip or lockout condition.
Alert
codes are
communicated via a red
fl
ashing 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
fl
ash 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
fl
ash the green
Warning
LED three
times indicating the compressor has short cycled more
than 48 times in 24 hours. A short cycle is de
fi
ned
as compressor runtime of less than 1 minute. 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
fl
ash 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
fl
ash the red
Alert
LED one time
indicating the motor PTC circuit has exceeded 4.5K
Ohms. 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
fl
ash 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.
