Liquid Controls SP2800 - Manual (Page 39)

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6-1 Warning Messages (continued)
6-1.5 BAD FREQ
Indicates that the values in the 16 Point setup
are not acceptable. This condition will occur
when the frequency values are not in ascending
order. The display will continue to display this
message until the error is corrected. To correct
the error see Section 3-3, Setup Procedure.
6-1.6 SECURITY
Indicates that no signal has come in for the
duration time set in the Lockout menu. Lockout
code must be entered before the unit will con-
tinue. Section 3-3, Setup Procedure.
6-2 Troubleshooting
6-2.1 General
The following troubleshooting procedures have
been developed as an aid in locating defects.
Not every possible problem has been listed, but
a general isolation procedure for tracking down
problems has been given. A standard recom-
mendation is the removal of power for 2 sec-
onds. This allows the microprocessor to go
through a reinitialization cycle at power up. If it
is determined that the unit is faulty, contact your
local Factory Representative or Sales Office
concerning replacement. The Batcher is not
field serviceable and all repairs should be per-
formed by the factory.
6-2.2 Problems
Symptom: Display will not light.
Possible Cause: No power to unit, power to unit
not to specifications or bad connection between
display board and mother board.
Test Procedure: See Specifications Section 1-
4 for proper input voltages. Then;
a) Check AC voltage input on terminals 17 &
18.
b) (if DC Powered unit) Check DC voltage input
on terminals 12 & 14.
c) Check connection of display board to mother
board
Corrective Action: If all checks okay, replace
unit.
6-2.2 Problems
Symptom: Unable to start batch.
Possible Cause #1: Displayed Batch count al-
ready exceeds the Preset value.
Test Procedure: Check Preset value against
the displayed value. If the Preset is less, go to
corrective action.
Corrective Action: Reset the unit by pressing
the CLR button or change the Preset to a
larger value.
Possible Cause #2: Incorrect programming.
Test Procedure: Check for programming er-
rors, review manual.
Corrective Action: Reprogram unit as re-
quired.
Possible Cause #3: Defective Circuit board or
component.
Test Procedure: Press the Start button and
check for relay action. An OHM meter across
the appropriate relay terminals should give
the proper indication. (Be sure to disconnect
all power to the relay terminals first!)
Corrective Action: If no relay action replace
unit.
Symptom: Unit not totalizing.
Possible Cause #1: Incorrect programming.
Test Procedure: Check for programming er-
rors, review manual. For Example, if the K
Factor is too large it may take some time be-
fore a count is registered on the display.
Corrective Action: Reprogram unit as re-
quired.
Possible Cause #2: Input signal invalid.
Test Procedure: See Specifications Section
1-4 for proper input signals. Then use oscillo-
scope to;
a) Check Analog input on terminals 3 and
12 for proper current or voltage levels.
b) (if Digital unit) Check Digital voltage
input on terminals 3 and 12.
Corrective Action: If inputs check okay, re-
place unit.