ALPHA2 QUICK START MANUAL

17

10. TROUBLESHOOTING

10.1 INPUT STATUS ERROR

• Place the Alpha2 controller in the Stop mode.

• Cycle the power to the equipment connected to the input terminals

and check if the input status is displayed correctly.

• If it is not correctly displayed, check the points below.

1. Check the wiring for the power supply and the inputs.

2. Check if the equipment used for the inputs corresponds to the

specifications in this manual.

NOTES ON USE

Do not connect a wire with a soldered end to an Alpha2 series terminal

due to poor contact and the possibility of the wire shearing.

10.2 OUTPUT STATUS ERROR

• Place the Alpha2 controller in the Stop mode.

• Force the outputs ON/OFF and check the operation of the outputs.

• Check that the program is written to perform per the desired results.

• If there is still an error, check the points below:

1. Check the wiring for the power supply and the outputs.

2. Check if the equipment used for the outputs corresponds to the

specification in this manual.

NOTES ON USE

Perform the forced ON/OFF operations only after thoroughly checking

that it is safe to do so. Damage to the machine or controller or a safety

issue could arise if the forced ON/OFF is performed inappropriately.

If proper precautions are not taken, damage to the equipment or

machine failure may occur.

10.3 TOP MENU IS NOT DISPLAYED

The menu key should be operated to access the Top Menu. Push the

keys “OK” and “ESC” at the same time. If the menu call key is not set,

use either the programming software to the Stop mode or do the forced

stop operation.

The Top Menu cannot be accessed from the keys. However, by cycling

the power supply and pressing the “OK + ESC” keys simultaneously

during the power up, the Top Menu will appear.

FORCED STOP OPERATION

1. Turn the Alpha2 series power supply off.

2. Turn the power ON again while pushing the “OK” and “ESC” keys

simultaneously. The option to place the controller in Stop mode will

be available for approximately five seconds. Press the “OK” key to

enter the Stop Mode. If no key is pressed, the controller will default

back into the Run mode.

3. Push “ESC” key.The “Top Menu” is displayed.

checking that it is safe to do so. Damage to the machine or controller

or a safety issue could arise if the forced ON/OFF is performed

inappropriately. If proper precautions are not taken, damage to the

equipment or machine failure may occur.

10.4 CANNOT ENTER RUN MODE

When the Alpha2 series will not switch to Run mode, check the

following.

1. The message “Input Error” or “Output Error” is displayed on the

screen. The program has more points of input and/or output than is

allowed in the controller body.

a) When making the program with the programming software.

The content of the program and the model are checked with the

programming software. Write the program to the Alpha2 series

controller.

2. The program data has an error.

When the program cannot be displayed with “ProgEdit” in “TopMenu”,

it is possible that the program data was damaged. Delete the

program and then write or install a new program.

10.5 INCORRECT CLOCK DATA

When approximately 20 days or more have passed since power was

supplied to the Alpha2 series, the time data is lost. In this case, the

time data should be set.

10.6 THE “?” APPEARS ON THE DISPLAY

The “?” mark is displayed when an unacceptable key is pressed

according to the screen data. Confirm the acceptable options and

press the appropriate key.

10.7 CANNOT USE AN OPERATION KEY

Check the movement of the operation keys according to the following

procedures when the Alpha2 series will not accept a key operation. If

the steps outlined in instructions (1) - (5) below can be performed, the

keys are operating properly. Please check if the key(s) are used in the

program.

1. Place the controller in the Stop mode.

2. Scroll through the Top Menu with “p” key or “ q” key.

3. Move the cursor to “ClockSet” with “p” key or “ q” key, and push the

“OK” key twice. The “ClockSet” screen is displayed.

4. Try to change the month/year data using the “t” key, “u” key, “+” key

and “-” key.

5. Push the “ESC” key.

10.8 INCORRECT LCD DISPLAY

Check the following items.

• If the character is displayed in reverse and the entire screen is black,

then the Alpha2 controller display has been damaged.

• An Unexpected Display Configuration is Shown

When the display does not appear as expected, please check the

following points in the program.

1. Adjust the position where each display function begins. Two separate

displays might have an overlapping display area that causes the

undesired result.

2. The character fails to display

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Check if the input pin to the Display Function Block is On.

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Check whether there is a conflict with another display.

Mitsubishi Electric Automation, Inc.