Emerson AE8-1385 specifications Operation

Application Engineering
B U L L E	T	I	N	AE8-1385

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.

Module LED Description

POWER LED (Green): indicates the module is powered with 18 to 28 volts.

ALERT LED (Yellow): communicates an abnormal system condition through a unique flash code. The ALERT LED will flash a number of times consecutively, pause and then repeat the process. The number of consecutive flashes, defined as the Flash Code, correlates to a particular abnormal condition. Detailed descriptions of specific ALERT Flash Codes are shown in Table 1.

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 flashing LED correlating to a LOCK condition in which the module will prevent the compressor from starting.

Module Operation/Code Description

Code 1 – Long Run Time

The module will flash 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 flash 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 flash red two times.

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Code 3 – Pressure Switch Cycling

The module will flash 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 flash red three times.

Code 4 – Locked Rotor Trip

The module will flash 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 flash red four times.

Code 5 – Compressor (Moderate Run) Trip

The module will flash yellow five 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 flash red five times.

Code 6 – Open Start Circuit

The module will lockout the compressor and flash 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 flash 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 flash 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 flash 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 flash a Code 10. The red LED will flash 10 times with the yellow LED remaining