Electronics AC - Manual (Page 8)

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blocked.
2. Setpoint does not control motor current
a. Green LED (1 - 7) “Local” should be on for local setpoint knob operation.
b. Enable signal must be present (Terminal #3). The “Enable” LED must be lighted (1-2).
c. MagnaValves operate using a magnetic field and have no moving parts. Large air suc-
tion in some wheel designs may pull shot through the valve. This symptom is character-
ized by having shot flowing when valve is off (red valve LED=off). Providing an aspiration
air inlet below the MagnaValve may be necessary. Contact factory for assistance.
d. MagnaValve valve driver module may be defective. The output current setting is listed on
the valve driver module. Check the valve current at 100% duty cycle (Red LED con-
stantly on) with an ammeter in series, with wire lead from the controller to the valve
driver module. Contact factory for assistance.
3. No alarm relay contact output.
a. Enable must be on (1 - 2).
b. Servo switch must be on (2 - 11).
c. High (1-5) or low (1 - 6) Alarm LED must be on and in the bright mode for alarm relay
contact to transfer.
d. Check alarm bandwidth; it may be too large.
e. Check wiring from the terminals:
i. High Alarm Relay Contact = #11
ii. Common Alarm Relay Contact = #12
iii. Low Alarm Relay Contact = #13
f. Alarm Reset signal (120VAC) should be absent from terminal #14. (NOTE: Alarms are
cleared or reset each time a new Enable signal is received; therefore, using the manual
alarm reset feature is not necessary.)
4. Cannot achieve any flow, or motor amps are very low.
a. Enable light must be on (1 - 2).
b. Setpoint command must be present (check setpoint using toggle switch to right).
c. Red LED "Valve" should be bright and blinking or constantly on. An internal circuit
breaker has tripped if it is dim. Check for short-circuit valve wiring at Terminals #7 and
#8. To reset the circuit breaker, remove and reapply the Enable signal.
d. Check Red LED at MagnaValve junction box. If it is not off, check for a wiring problem. If
it is on, verify that the current going to the valve driver module matches the value written
on the label of the valve driver module.
e. Check for contamination in or above the MagnaValve, especially check for water, oil, or
dust mixture in the shot, or other obstructions.
f. The MagnaValve or valve driver module may be defective. To check, remove the Mag-
naValve from machine (keep wires attached). Enable the output and get red LED valve
on at 100% duty cycle. When the Valve LED is on, the magnetic field inside the Magna-
Valve should be perfectly canceled. No shot should stick inside the MagnaValve. If any
shot sticks to the valve, then either the valve driver module or the MagnaValve is defec-
tive. Measure the dc current going to the valve driver module in the red wire. Compare
your measurement with the value written on the label of the valve driver module. If your