TROUBLESHOOTING
43
Auto Recycle
Press the “FUNCTION” key, press “81”, then press
“ENTER”. The display should indicate “0”. 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 indi-
cate “0” and the COUNT indicator lit. Make a
momentary connection between terminals #10 and
#12 five times. You should hear output relay K1
activate and the display should show “0”.
Power Outage
Disconnect the AC power. You should hear relay
K1 release.
INTERNAL DIAGNOSTICS
The control has several internal diagnostic rou-
tines 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 previ-
ously 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 auto-
matically to normal operation.
NOTE
The self-diagnostics should not be per-
formed while the process being controlled
is running. The control responds to count
pulses but ignores any incoming control
signals while the diagnostics are operat-
ing.
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
This test determines if the permanent memory
which controls how the control operates is good.
Internal RAM (Random Access Memory) Bit
Test - Test #2
This routine tests the temporary workspace mem-
ory 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.
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,
,
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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 unpow-
ered. If this test fails, check all function code val-
ues and the values of the counter and preset to
insure they are correct. Then disconnect and
reconnect power to perform this test again. If the
