Durant Preset Checkout

Check-Out Procedure

If the control does not perform satisfactorily, check all connections, proceed through the troubleshooting chart, and check all function codes for proper set-up according to the table. If these tests proceed correctly and the control is still not properly functioning, remove ALL wiring from the back of the control and proceed through the following steps. If the control fails to function in any of the steps, contact Murray Equipment.

Power Input

Connect 120 VAC between terminals #25 and #26.  Jumper terminal #25 to terminal #28 and jumper terminal #26 to terminal #27.  The display should flash for a short period of time and then remain lit.  Place electrical tape over terminals #25 through #28 to prevent electrical shock during the next tests.

Keyboard

Press the "FUNCTION" key, the display should blank.  Press "43" which the display should indicate.  Press ENTER, the display should show "O".  Press "1 " which the display should indicate.  Press "ENTER".  The display should flash "O" and the “COUNT" indicator for a short period of time then remain lit.  

Count Up

Make a momentary connection between terminals #10 and #12.  The display should increment several counts.  Make a connection with a short piece of wire between terminals #11 and #12 and repeat the count test between terminals #10 and #12.  Retain the connection between terminals #11 and #12.

Count Down

Make a momentary connection between terminals #14 and #12. The display should decrement several counts.  Make a connection with a short piece of wire between terminals #13 and #12 and repeat the count test between terminals #14 and #12.  Retain the connection between terminals #13 and #12.  Decrement the counter until the display indicates less than “5".  

Preset

Press the "PRESET" key and the display should show "O".  Press the "5" key, which the display should indicate.  Press the "ENTER" key.  The display should blank for one half second then remain lit.  Press the "COUNT" key, the display should indicate the previous count value. Make a momentary connection between terminals #10 and #12 at least five times.  You should hear the output relay actuate.

Relay Timeout

Reset

Unlatch

Again make a momentary connection between terminals #10 and #12 at least five times.  Before the ten second timeout elapses, make a momentary connection between terminals #2 and #8.  You should hear the output relay release.  Press the "RESET" key again.

Latch Until Reset Complete

Press the "FUNCTION" key, press "36", then press "ENTER".  The display should indicate "O".  Press the "1" key, then "ENTER".  The display should show "1", blank for one half second then remain lit. Press the "FUNCTION" key, press 30, then press "ENTER".  The display should show "10.00".  Press the "O" key, then "ENTER". The display should show "0.00", blank for one half second then remain lit.  Press the "COUNT" key.  The display should indicate "O" and the COUNT indicator lit.  Make a momentary connection between terminals #10 and #12 at least five times.  You should hear the output relay activate.  Press the "RESET" key.  The display should display "O" and you should hear the relay release.

Auto Recycle

Press the "FUNCTION" key, press "81", then press "ENTER".  The display should indicate "O".  Press the "1 " key, then "ENTER".  The display should show "1 ", blank for one half second, then remain lit. Press the "COUNT" key.  The display should indicate "O" and the COUNT indicator lit.  Make a momentary connection between terminals #10 and #12 five times. You should hear the output relay activate and the display should show "O".

Power Outage

Internal Diagnostics

The control has several internal diagnostic routines, which allow it to self-test various operational characteristics. When power is applied, the control tests its memory to determine if it has retained all of the values and function code parameters previously entered. It also tests to insure that all of the internal memory is functional. During these self-tests, the display is blanked. Since the tests are performed very quickly, the user usually does not notice the short delay on power-up.

The user also has the ability to initiate the control self-test diagnostics at any time. Function code 40 is used to initiate the diagnostics. If the control fails any of the diagnostic routines, either on power-up or upon manual command, the display will flash a number indicating which of the six self-tests failed. If no failures are found, the control returns automatically to normal operation.

Note:

The self-diagnostics should not be performed while the process being controlled is running. The control responds to count pulses but ignores any incoming control signals while the diagnostics are operating.

Description Of The Diagnostics

The diagnostics which are included and their related test numbers are as follows.

#1 -ROM (Read Only Memory) 16 Bit Checksum

#2 -Internal RAM (Random Access Memory) Bit Test

#3 -Non-Volatile RAM Read/Write Bit Test

#4 -Non Volatile RAM Store Test

#5 -Non-Volatile RAM 8 Bit Checksum

#6 -Watch Dog Timer (1.3 Seconds) Timeout

ROM (Read Only Memory) 16 Bit Checksum - Test #1

Internal RAM (Random Access Memory) Bit Test -Test #2

This routine tests the temporary workspace memory used for normal operation and communication.  If a failure occurs, the counter may change or lose values or operating characteristics unexpectedly.

Non-Volatile RAM Read/Write Bit Test - Test #3

This test checks the memory which permanently stores the operating characteristics and values when a power outage occurs.

Non-Volatile RAM Store Test - Test #4

This test insures that the non-volatile memory accurately stores and retrieves the programmed operating characteristics and values upon a power outage.  If a failure of this type occurs, the counter will operate correctly but could change its values or operating characteristics upon a power failure or power drop-out.  

CAUTION 

TO INSURE PROPER OPERATION CHECK ALL FUNCTION CODE VALUES BEFORE STARTING THE PROCESS. NOTE THAT A TEMPORARY POWER INTERRUPTION MAY CHANGE THE VALUES OF FUNCTION CODES DURING THE PROCESS IF TEST #4 HAS FAILED.  

Non-Volatile Ram 8 Bit Checksum Test - Test #5

A checksum test is performed on the non-volatile memory to insure that none of the information stored was changed while the control was un-powered.  If this test fails, check all function code values and the values of the counter and preset to insure they are correct. Then disconnect and re-connect power to perform this test again.  If the test fails the second time, return the counter for repair.  

Watch Dog Timer (1.3 Seconds) - Test #6

While the control is operating, an internal Watch Dog Timer is incremented every millisecond. Under normal operation, the control automatically resets the Watch Dog Timer at least once per second.  If the control would malfunction during operation, the Watch Dog Timer may time out (depending on the type of malfunction) and an error code of "6" flashes on the display.  If this type of failure occurs, run the diagnostics using Function 40.  Excessive electrical interference may cause this type of failure without damage to the control or the operating characteristics.  If the diagnostics find no other fault, it is reasonable to assume that the control is fully operational, unless this failure is recurring.

Operation of Diagnostics

When power is applied, the control begins by performing tests #1, #2, #3 and #5.  If all of these pass, the counter is ready to operate as indicated by flashing the count value on the display at one half second intervals for four seconds, then remaining lit.

To select the self-diagnostic mode, specify Function code 40 and enter a value of "l ".  The control immediately turns on all display segments and LED indicators for 2 seconds.  The displays blanks.  The control steps through all five tests.  If all five pass, the control begins a display and LED test routine. This routine sequences through flashing the numbers "O" through "9" on the displays, alternates the Preset and Count LED indicators and moving the decimal point from digit to digit.  When the display sequence is finished, the control shows the count value and the Count indicator is lit.

The self-diagnostics should not be performed while the process being controlled is running.  The control responds to count pulses but ignores any incoming control signals while the diagnostics are operating.

Performing the diagnostic routines does not affect the Function code parameters.  Thus, when the diagnostics are finished, the control retains all of the operational characteristics previously programmed.

WHAT TO DO IF THE CONTROL FAILS A DIAGNOSTIC TEST  

If the control flashes a single digit number continuously on power-up or when the self-diagnostics are performed, it indicates which one of the tests has failed.  When the number displayed is "4", "5", or "6", the control can be allowed to operate by pressing the FUNCTION key to clear the display.  

WARNING

RUNNING THE COUNTER AFTER A FAILURE HAS BEEN DETECTED CREATES A SERIOUS RISK TO THE OPERATOR AND/- OR MACHINERY.  

As a minimum safety precaution, the Function code Default mode (Function 43) should be selected (enter a value of "1") and the Function codes reprogrammed. This will insure that the failure has not altered any of the operating characteristics of the counter. Selecting the default parameters with Function 43 also per- forms the power-up self-test, which could give another failure indication (for tests #1, #2 or #3).  If this occurs, return the control for repair immediately.