Electronics FC-24 - Manual (Page 6)

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display reads the desired value. Since the control is in manual mode, an unstable flow
rate indicates that the machine itself is causing the problem, not the servo adjustments
(the servo is off).
8.SPARE PARTS LIST
There are no spare parts for the FC-24 controller. It is recommended that a spare controller
be purchased or the controller be sent to Electronics Inc. for repair service.
9.TROUBLE-SHOOTING GUIDE
A. SYMPTOM: Unstable operation. If the display indicates flow rate variations of more than
5%, check for the following:
1. Air Blast Systems: Air leaks - nozzle, hose, valve, etc.
2. Pressure regulator malfunction (may be pulsing).
3. Contaminated shot (dust, oil, water, and broken shot).
4. Blast hose restricted during nozzle movement.
B. SYMPTOM: Display reads high value and doesn't change.
1. Wiring defect in the cable to the MagnaValve. Check voltages at Terminals #17 and
#18 for proper connection to the MagnaValve.
2. Be sure the MagnaValve is installed right side up (see flow arrow).
3. Check to see if the lower portion of the MagnaValve is full of shot due to hose blockage
etc.
4. SYMPTOM: Setpoint does not control flow rate.
5. Control must be in “Ready” mode, the “Enable” signal must be present (Terminal #4)
and the "On" LED must be lighted (1-7).
6. MagnaValves operate using a magnetic field and have no moving parts. High differen-
tial air pressure in air peening applications or suction in wheel peening applications,
may force shot through the valve. This symptom is characterized by having shot flow-
ing when the valve is off (red valve LED=off). For direct pressure air-peening systems,
be sure the air pressure in the pressure pot is equal to boost the air supply. This will
eliminate the differential air pressure that can force shot through the MagnaValve.
C. SYMPTOM: No alarm output.
1. “On” LED must be on (1-7).
2. “Servo” must be on (2-19).
3. High (1-2) or low (1-3) Alarm LED must be on (bright) for alarm relay contact to trans-
fer.
4. Check ± alarm bandwidth; it may be too large.
5. “Alarm Reset” signal, (24Vdc) should be absent from terminal #12
D. SYMPTOM: Cannot achieve any flow, or flow rate is very low.
1. “On” light must be on (1 -7).
2. Setpoint command must be present, push (1-8).
3. Bar graph display must have one or more elements on.
4. Check the red LED (2-13) at the MagnaValve. If it is not "on", check for a wiring prob-
lem. Check for contamination in or above the MagnaValve, especially check for water,
oil, or dust mixture in the shot, or other obstructions. To check, remove the Magna-
Valve from the machine (keep wires attached). Enable the output and get the red LED
valve "on" at 100% duty cycle. When the Valve LED is on, the magnetic field inside the
MagnaValve should be completely canceled. No shot should stick inside the Magna-
Valve. If any shot sticks to the valve, then the MagnaValve is defective.