Graco 278680, Instructions Manual, Page: 21 / 28

Motor Control Diagnostics
332257A 21
Motor Control Diagnostics
NOTE:
• Keep a new transducer on hand to use for test.
• No display does not mean the sprayer is not pres-
surized. Before repair, perform
Pressure Relief
Procedure , page 8.
1. For sprayers with digital display, see Digital Display
Messages.
2. Remove screws (12) and cover (50).
3. Turn ON/OFF switch ON.
4. Observe LED operation and reference following
table:
NOTICE
Do not allow sprayer to develop fluid pressure without
transducer installed. Leave drain valve open if test
transducer is used.
DISPLAY
LED
BLINKS
SPRAYER OPERATION INDICATES WHAT TO DO
No Display Never
blinks Sprayer stops. Power is not
applied. Sprayer must be
pressurized. Loss of power. Check power source. Relieve pres-
sure before repair or disassembly.
psi/bar/MPa Once Sprayer is pressurized.
Power is applied. (Pressure
varies with tip size and pres-
sure control setting.) Normal operation Do nothing
E=02 Two times
repeatedly Sprayer may continue to run.
Power is applied. Run away pressure.
Pressure greater than
4500 psi (310 bar, 31
MPa) or damaged pres-
sure transducer Replace motor control board or pres-
sure transducer
E=03 Three times
repeatedly Sprayer shuts down and LED
continues to blink three times
repeatedly Pressure transducer is
faulty or missing Check transducer connection. Open
drain valve. Substitute new transducer
for transducer in sprayer. If sprayer
runs, replace transducer
E=05 Five times
repeatedly Sprayer does not start or
stops and LED continues to
blink five times repeatedly.
Power is applied. Motor fault Check for locked rotor, shorted wiring
or disconnected motor. Repair or
replace failed parts.
E=06 Six times
repeatedly Sprayer stops and LED
blinks six times repeatedly.
Power is applied. Motor is too hot or there
is a fault in motor ther-
mal device Allow sprayer to cool. If sprayer runs
correctly when cool, check motor fan
function and air flow. Keep sprayer in
cool location. If sprayer does not run
when cool and continues to blink six
times, replace motor.
- - - Power is applied. Pressure less than 200
psi (14 bar, 1.4 MPa). Increase pressure if desired. Drain
valve may be open.
E=10 Blinks 10
times
repeatedly Sprayer does not start or
stops and LED continues to
blink 10 times repeatedly.
Power is applied. High control board tem-
perature. •
Make sure motor air intake in not
blocked.
•
Make sure control board is properly
connected to the back plate and
that conductive thermal paste is
used on the power components.