Graymills 795-90716 LKN - Manual (Page 14)

Graymills Corporation – 3705 N. Lincoln Avenue – Chicago, IL 60613 – 773-248-6825 – Fax 773-477-8673 – www.graymills.com – 14
TROUBLESHOOTING GUIDE
CONDITION POSSIBLE CAUSE CORRECTION
Platform not at top of stroke
Machine not “READY”
Press RESET button
“READY” light not illuminated
Position sensor malfunctioning Check/replace sensor
Low air supply Adjust FRL to read 90-100 PSI
Items left on lid causing obstruction Remove obstruction
Position sensor malfunction Check/replace sensor
”LID LIFT FAILED” Screen
Malfunctioning solenoid valve Check/replace valve
Low air supply Adjust FRL to read 90-100 PSI
Items on platform causing obstruction Remove obstruction
Position sensor malfunction Check/replace sensor
Machine overloaded Remove load
“LIFT PLATFORM FAILED TO
RAISE” Screen
Malfunctioning solenoid valve Check/replace valve
Obstruction beneath platform Remove obstruction
Position sensor malfunction Check/replace sensor
“LIFT PLATFORM FAILED TO
DESCEND COMPLETELY” Screen
Malfunctioning solenoid valve Check/replace valve
Post Emergency Stop reset Press RESET again
No air pressure
Ensure air pressure supplied to machine,
check air line to safety link for leaks
Safety link valve malfunction Inspect/replace safety link valve
Safety link failed due to fire Contact Graymills
“SAFETY LINK ACTIVATED”
Screen (Heated units only)
Safety link failed due to malfunction Inspect/replace safety link
Touchscreen not powering up after
disconnect actuated
Circuit breakers in control enclosure tripped
Power off machine, open enclosure, reset
breakers if tripped. If problems persist,
contact Graymills
Touchscreen screen saver is on Touch screen to enable
PLC Control
Touchscreen dark while machine
cycling
Touchscreen failure
Check connections and replace if
necessary
Electrical service to motor is incorrect Check electrical supply and correct
Motor is burned out
Replace motor or return pump to Graymills
for repair
Motor breaker tripped
Check breakers and correct. If problems
persist, contact Graymills
Pump does not run
Faulty motor contactor Check/replace
Pump runs but does not agitate
Pump rotation is incorrect (3-phase power
only)
Swap connections of two of the three
electrical leads to the motor (CCW is
correct rotartion)
Optio
n
al Pum
p
Pump runs, but is noisy (Some
noise is normal)
Cavitation due to low liquid level Raise liquid level to correct level
Thermostat set too low Raise thermostat setting
Faulty heater(s) Check/replace
Malfunctioning heater contactor(s) Check/replace
Tank does not reach proper
operating temperature
24/7 settings incorrect
Check timer settings to ensure they are
correct
Op
tion
al Heat
Tank takes too long to heat
One element of tri-element heater(s) is
burned out
Check/replace
Up/down motion of lift platform is
noisy Roller wheels wearing and may need
replacing
Visually inspect wheels for wear. Graymills
recommends replacing all wheels at once
to minimize risk of future failures and
downtime. Contact Graymills for more
information.
Other
Skimmer (optional) not turning on Bad motor Check/replace