Graco Therm-O-Flow 20 Instructions - Parts Manual page 43

Code Description
DC X Pump Diving
L1 X Material Level Sensor
Error
L2 X Material Level Empty Alarm
L3 X Material Level Low
MMUX USB Log Full
MN X Pump _ Requires
Maintenance
Ta★ Over Temperature
Switch
T1 _ Low Temp. Unit _
Zone _
T2 _ Low Temp. Unit _
Zone _
334129S
Type Cause
Alarm Pump is trying
to feed
adhesive, no
adhesive to
feed.
Worn or
damaged
Pump seals
Alarm Machine is
detecting an
empty state
without a low
state
Material drum
is empty
Deviation Material level
is low
Advisory USB logs fulls.
Data loss will
occur if not
downloaded.
Advisory User defined
Pump
maintenance
counter has
run out
Alarm An over
temperature
switch has
opened.
Alarm Zone
temperature
too low
Deviation Zone
temperature
too low
Solution
Adjust the drum empty level sensor to detect
an empty state.
Ensure the Ram Director Valve is in the down
position and sufficient air is forcing the Ram
down.
Melter at incorrect temperature, too low.
Check setpoint and set to manufactures
recommendation.
Inspect Pump seals and replace if necessary
Make sure the empty level sensor is not
covered in material
Verify the low level sensor is plugged into J15
of the daughter board. Verify the low level
sensor is close enough to the metal bar; adjust
if necessary.
Replace sensors.
Replace material container. If more material is
leftover, lower the empty level sensor.
Replace at appropriate time.
Download USB data or disable the USB log
errors on the Advanced screen 3.
Perform Pump maintenance, then reset the
counter on the maintenance setup screen.
Check Heat Rate Option on Advanced Screen
2 to make sure it is set to Normal or Slow. If set
to Fast, the switch will open on the pump or
platen.
If "_" is 9, A, B, or C, make sure jumper
16W035 is installed in J5 on MZLP 5 and
MZLP 7 (for tandem units).
Reduce flow rate.
Increase temperature of accessory upstream.
Faulty accessory heater measure resistance
between heater leads.
Change Low Temp Alarm Offset.
Replace accessory.
Reduce flow rate.
Change Low Temp Deviation Offset.
Add zone (temperature) upstream.
Troubleshooting
43