Mitsubishi Electronics PCA-A24GA Error Signal receiving error, Error Transmitting error

Page 18

Error Code Abnormal point and detection method

Cause

Countermeasure

 

Indoor/outdoor unit communication

1 Contact failure, short circuit or, ∗ Check LED display on the outdoor control cir-

 

error (Signal receiving error)

miswiring (converse wiring) of

cuit board. (Connect A-control service tool,

 

1 Abnormal if indoor controller board

indoor/outdoor unit connecting

PAC-SK52ST.)

 

cannot receive any signal normally for 6

Refer to EA-EC item if LED displays EA-EC.

 

wire

 

minutes after turning the power on.

1 Check disconnection or looseness of indoor/

 

2 Defective transmitting receiving

 

2 Abnormal if indoor controller board

circuit of indoor controller board

outdoor unit connecting wire of indoor unit or

 

cannot receive any signal normally for 3

outdoor unit.

 

3 Defective transmitting receiving

E6

minutes.

Check all the units in case of twin indoor

3 Consider the unit as abnormal under the

circuit of indoor controller board

unit system.

 

 

following condition: When 2 or more

4 Noise has entered into indoor/

2-4Turn the power off, and on again to

 

indoor units are connected to 1

outdoor unit connecting wire.

check. If abnormality generates again,

 

outdoor unit, indoor controller board

 

replace indoor controller board or outdoor

 

cannot receive a signal for 3 minutes

 

controller circuit board.

 

from outdoor controller circuit board, a

 

∗ Other indoor controller board may have

 

signal which allows outdoor controller

 

defect in case of twin indoor unit system.

 

circuit board to transmit signals.

 

 

 

 

 

 

Indoor/outdoor unit communication

1 Defective transmitting receiving 1-3Turn the power off, and on again to

 

error (Transmitting error)

circuit of indoor controller board

check. If abnormality generates again,

E7

Abnormal if “1” receiving is detected 30

2 Noise has entered into power

replace indoor controller board.

times continuously though indoor controller

supply.

 

 

 

 

board has transmitted “0”.

3 Noise has entered into outdoor

 

 

 

control wire.

 

 

 

 

 

 

Indoor controller board

1 Defective indoor controller

1 Replace indoor controller board.

Fb

Abnormal if data cannot be normally read

board

 

from the nonvolatile memory of the indoor

 

 

 

 

 

 

controller board.

 

 

 

 

 

 

 

Remote controller control board

1 Defective remote controller

1 Replace remote controller.

1Abnormal if data cannot be normally read from the nonvolatile memory of the

E1

remote controller control board.

 

 

(Error code: E1)

 

 

or

 

 

 

 

 

E2

2 Abnormal if the clock function of remote

 

 

 

controller cannot be normally operated.

 

 

 

(Error code: E2)

 

 

 

 

 

 

 

Forced compressor stop

1 Drain pump trouble

1 Check the drain pump.

 

(due to water leakage abnormality)

 

 

 

1 When the intake temperature subtracted

2 Drain defective

2 Please confirm whether water can be

 

with liquid pipe temperature is less than

· Drain pump clogging

drained.

 

-10:(14˚F), drain sensor detects

· Drain pipe clogging

 

 

whether it is soaked in the water or not

 

 

 

at the interval of 90 seconds. (Drain

3 Open circuit of drain sensor

3 Confirm the resistance of the drain sensor.

 

pump will start operating when the drain sen-

side heater

 

 

sor detects to be soaked in the water.)

 

 

 

2 The unit has a water leakage abnormality

4 Contact failure of drain sensor 4 Check the connector contact failure.

 

when the following conditions, a and b,

connector

 

 

are satisfied while the above-mentioned

 

 

 

detection is performed.

5 Dew condensation on drain

5 Check the drain sensor leadwire mounted.

 

a) The drain sensor detects to be

sensor

Check the filter clogging.

PA

soaked in the water 10 times in a row.

· Drain water trickles along

 

b) The intake temperature subtracted

lead wire.

 

(2502)

 

with liquid pipe temperature is detect-

· Drain water waving due to filter

 

(2500)

 

ed to be less than -10:(14˚F) for a

clogging

 

 

 

 

total of 30 minutes. (When the drain

 

 

 

sensor detects to be NOT soaked in

6 Extension piping connection

6 Check the piping connection.

 

the water, the detection record of a

difference at twin system

 

 

and b will be cleared.)

 

 

3The drain sensor detection is performed

in operations other than cooling. (When

7 Miswiring of indoor/ outdoor

7 Check the indoor/ outdoor connecting wires.

the unit stops operating, during heating

connecting at twin system

 

or fan operation, when the unit stops

 

 

because of some abnormality)

 

 

*Once the water leakage abnormality is

8 Room temperature thermistor /

8 Check the room temperature display of

detected, abnormality state will not be

liquid pipe temperature thermis-

remote controller.

released until the main power is reset.

tor detection is defective.

Check the indoor liquid pipe temperature

 

 

display of outdoor controller board.

18

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Contents PCA-A24GA ContentsRevised EDITION-B PCA-A30GATechnical Data Book Technical ChangesReference Manual Safety Precaution Always Observe for SafetyWhen charging directly from cylinder Additional refrigerant chargePart Names and Functions Indoor UnitDisplay Section Temperature setting display Operation Mode displayMode Select button Timer displayPCA-A30GA, PCA-A30GA1Single phase, 60Hz, 208/230V SpecificationsService Ref PCA-A36GA, PCA-A36GA1Single phase, 60Hz, 208/230VPCA-A30GA1 Noise Criterion CurvesPCA-A24GA1 PCA-A36GA1Outlines and Dimensions PCA-A24GA PCA-A24GA1 PCA-A30GA PCA-A30GA1PCA-A36GA PCA-A42GA PCA-A36GA1 PCA-A42GA1 Unit inchmmWiring Diagram Indoor unit Installation ManualRefrigerant System Diagram Heat exchangerTroubleshooting TroubleshootingSELF-DIAGNOSIS Action Table Pipe temperature Cause Countermeasure Freezing/overheating protection isWorking ErrorE0/signal receiving errorE4 Cause Countermeasure Pipe temperature thermistorRemote controller transmission ErrorE3/signal receiving errorE5Remote controller control board Error Signal receiving errorError Transmitting error Indoor controller boardIs off Troubleshooting by Inferior PhenomenaPhenomena Cause Countermeasure Ply system3Upward/downward vane 4Receiver for wireless remoteIs blinking Performance failurePage Vane motor MV Test Point Diagram Between 1 to 3 12.6-13.7V DC Pin1 +Connect to the indoor controller board CN2D PCA-A36GA PCA-A36GA1 Functions of DIP Switch and Jumper Wire ModelsRemoving the air intake grille Disassembly ProcedureOperating Procedure Photos & Illustrations Removing the electrical boxRemoving the sirocco fan Operating ProcedureRemoving the fan motor MF Remove the air intake grilleRemoving the Indoor coil thermistor TH2/TH5 Operating Procedure PhotosRemoving the vane motor MV Removing the Under panelRemove the intake grille. See the figure Removing the drain panRemoving the guide vane Removing the Auto vaneRemoving the heat exchanger R01 29J 130 Parts No Parts Name SpecificationsDrawing No R01 35J 130Structural Part PCA-A24GA PCA-A30GA PCA-A36GA PCA-A42GA Electrical Parts PCA-A24GA PCA-A30GA PCA-A36GA PCA-A42GA Remarks Parts Name SpecificationsRoHS Parts NoStructural Part PCA-A24GA1PCA-A30GA1PCA-A36GA1PCA-A42GA1 Wiring Recom Electrical Parts PCA-A24GA1PCA-A30GA1PCA-A36GA1PCA-A42GA1RoHS Qty/ set

PCA-A24GA specifications

Mitsubishi Electronics has long been a pioneer in the field of industrial automation, and the PCA-A24GA is a notable addition to its line of high-performance programmable controllers. This compact yet powerful device is designed to optimize processes and increase efficiency across various applications, making it a preferred choice for industries ranging from manufacturing to building automation.

One of the standout features of the PCA-A24GA is its versatility. The controller offers a wide range of input/output (I/O) options, enabling seamless integration with various sensors and actuators. With 24 digital input channels and 16 relay output channels, the PCA-A24GA can handle complex control tasks while maintaining a compact footprint. This flexibility is further enhanced by its support for analog inputs and outputs, allowing for greater precision in monitoring and controlling processes.

The PCA-A24GA is built with cutting-edge technologies that ensure robust performance. It employs Mitsubishi's advanced processing algorithms, which enhance real-time data processing capabilities. This ensures responsive control, reducing lag and improving overall system performance. Additionally, the controller features an intuitive programming environment, making it accessible to both seasoned engineers and those new to automation programming.

Communications are another strong suit of the PCA-A24GA. It offers multiple communication protocols, including Ethernet and RS-232, which allow for easy connectivity to various devices and systems. This ensures that the PCA-A24GA can be integrated into existing networks without significant modifications, facilitating smoother transitions and upgrades.

In terms of reliability and durability, the PCA-A24GA excels. Designed to operate in demanding environments, it is built to withstand temperature fluctuations, vibrations, and dust, which is essential for industrial settings. The controller's long operational life reduces maintenance costs and downtime, contributing to improved productivity.

Energy efficiency is also a key characteristic of the PCA-A24GA. Mitsubishi Electronics has designed this controller with eco-friendly technologies, making it suitable for organizations looking to reduce their carbon footprint while maintaining high levels of productivity.

In summary, the Mitsubishi Electronics PCA-A24GA stands out with its versatile I/O options, advanced processing capabilities, comprehensive communication protocols, and robust build. These features make it an excellent choice for industries seeking reliable and efficient automation solutions, securing Mitsubishi's reputation as a leader in the field.
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