Liquid Controls SCAMP - Manual (Page 15)

15
TROUBLE SHOOTING
PROBLEM: SCAMP will not power up.
SOLUTION: Using a digital multi-meter, check to ensure that 9-18 VDC is present at
the Terminal Strip, Positions 5 and 6. Check further to ensure that the
ground lead for the power supply is connected to Terminal 5, and that the
positive power supply lead is connected to Terminal 6. Tighten all
terminal connection screws.
PROBLEM: Field data is not being stored in SCAMP memory.
SOLUTION: Make sure that the “LOCK” jumper is in the left-most position indicating
the unit is unlocked, and that the Data Entry pushbutton is depressed
after setting the appropriate numerical values on the Data Switches. Data
is only entered into SCAMP memory after the Data Entry pushbutton is
depressed. NOTE: Multi-point calibration data must be entered with the
“0/1” jumper in the “1” position.
PROBLEM: SCAMP does not operate the counter during flow.
SOLUTION 1: Make sure that there are appropriate pull-up resistors for the attached
counter (SCAMP has open-drain outputs that switch to ground). NOTE:
Most counters include internal pull-up resistors on the pulse input
terminals. If your counter does not include such resistors, add the
resistors (300-ohm, minimum) between SCAMP terminals 6 – 7, and 6 –
8.
SOLUTION 2: Check for the presence of a disabling error, such as a failed temperature
probe for compensated systems. To check for such an error, place the
Function Switch in the “E” position and note the message scrolled on the
LED display. Take the corrective action indicated in the Error Message
Table.
PROBLEM: The electronic counter counts backwards during forward flow.
SOLUTION: Reverse the “A” and “B” wires on either the pulser or the counter.