Emerson AE8-1385 User Manual

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© 2011 Emerson Climate Technologies
Printed in the U.S.A.

Application Engineering

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OPERATION
Compressor Protection
The CoreSense Diagnostics module utilizes proprietary 

algorithms to protect the compressor and system from 

repeated trips of system pressure controls and the 

compressor internal overload. The protection terminal 

of the module should be wired in series with the system 

low pressure and high pressure cutouts, as well as 

the compressor contactor. When the module detects 

a series of trips as described below, it will activate a 

lockout feature that opens the solid state switch in the 

module, thereby cutting power to the contactor and de-

energizing the compressor.

POWER LED (Green): indicates the module is 

powered with 18 to 28 volts.

ALERT LED (Yellow): communicates an abnormal 

system condition through a unique fl ash  code. The 

ALERT LED will fl ash a number of times consecutively, 

pause and then repeat the process. The number of 

consecutive  fl ashes,  defi ned as the Flash Code, 

correlates to a particular abnormal condition. Detailed 

descriptions of specifi c  ALERT  Flash Codes are 

TRIP/LOCK LED (Red): indicates either a TRIP or 

LOCK condition.

•  TRIP:  is indicated by a solid illumination of the 

LED. This means the compressor is not running 

and demand is present at the module. 

•  LOCK:  is indicated by a fl ashing LED correlating to 

a LOCK condition in which the module will prevent 

the compressor from starting.

Code 1 – Long Run Time 
The module will fl ash yellow one time when the 

compressor operates for longer than 18 continuous 

hours. This is an alert code only, and the module will 

not lockout the compressor for this condition. This 

code is inactive for heat-pumps.

Code 2 – Compressor (Pressure) Trips 
The module will fl ash yellow two times when the 

compressor operates from 12 seconds to 15 minutes 

followed by a trip condition lasting longer than 7 

minutes. When four consecutive or ten total Code 

2 events are recorded, the module will lockout the 

compressor and fl ash red two times.

Code 3 – Pressure Switch Cycling 
The module will fl ash yellow three times when the 

compressor operates from 12 seconds to 15 minutes 

followed by a trip condition lasting between 35 

seconds to 7 minutes. When four consecutive or ten 

total Code 3 events are recorded, the module will 

lockout the compressor and fl ash red three times. 

Code 4 – Locked Rotor Trip 

The module will fl ash yellow four times when the 

compressor trips within 12 seconds of operation and 

does not reset and start within 35 seconds. When ten 

consecutive Code 4 events are recorded the module 

will lockout the compressor and fl ash red four times.

Code 5 – Compressor (Moderate Run) Trip 
The module will fl ash  yellow  fi ve times when the 

compressor has operated between 15 minutes and 

18 hours, followed by a compressor trip lasting longer 

than 7 minutes. When four consecutive or ten total 

Code 5 events are recorded, the module will lockout 

the compressor and fl ash red fi ve times. 

Code 6 – Open Start Circuit

The module will lockout the compressor and fl ash 

red six times if the module detects a demand signal 

in the “Y” terminal and current in the “R” winding of 

the compressor, but no current is detected in the “S” 

winding of the compressor for 2 seconds.

Code 7 – Open Run Circuit
The module will lockout the compressor and fl ash red 

seven times if the module detects a demand signal 

in the “Y” terminal and current in the “S” winding of 

the compressor, but no current is detected in the “R” 

winding of the compressor for 2 seconds.

Code 8 – Welded Contactor
The module will fl ash yellow eight times if it has 

detected line currents in the “S” and “R” windings and 

demand is absent for 15 seconds.

Code 9 – Low Voltage
The module will fl ash nine times if the module supply 

voltage drops below 17VAC for 2 seconds. The 

module will prevent the compressor from starting until 

adequate voltage is established.

Code 10 – Over-Current Protection 
When the current at the PROT terminal is greater than 

2A for 40ms, the module will fl ash a Code 10. The red 

LED will fl ash 10 times with the yellow LED remaining