Motor Control Board

Motor control board removal

WARNING

INJECTION HAZARD

To reduce the risk of serious injury, when instructed to relieve pressure, follow the Pressure Relief Procedure on page 8.

1.Relieve pressure.

2.Remove screws (25, 26) and lower heat sink (22) and motor control board (22a). See Fig. 21.

3.Disconnect wires (C), (D), (96), (E) and 108 from motor control board (22a). See Fig. 13.

4.Disconnect potentiometer (77) and transducer (67) from motor control board (22a).

5.Remove four screws and motor control board (22a).

6.Install new motor control board (22a) with four screws. Reconnect all wires and secure heat sink (22) to junction box (20).

CAUTION

To reduce the risk of a malfunction:

SBe sure the flat blade of the insulated male connector is centered in the wrap–around blade of the female connector when the connections are made.

SRoute all wires carefully to avoid interference with the motor control board or junction box.

Motor control board diagnostics

1.Relieve pressure.

2.Remove screws (25, 26) and lower heat sink (22) and motor control board (22a). See Fig. 21.

3.Turn ON/OFF switch ON.

4.Observe LED operation and reference following table:

LED

SPRAYER OPERATION

INDICATES

WHAT TO DO

BLINKS

 

 

 

 

 

 

 

Once

Sprayer runs

Normal operation

Do nothing

 

 

 

 

Twice

Sprayer runs

Normal operation

Do nothing

 

 

 

 

Twice

Sprayer shuts down and LED continues

Line voltage is too

Lower line voltage to 120 VAC

repeatedly

to blink twice repeatedly

high

 

 

 

 

 

Three times

Sprayer shuts down and LED continues

Pressure transducer

Replace pressure transducer

repeatedly

to blink three times repeatedly

is faulty or missing

 

 

 

 

 

Four times

Sprayer shuts down and LED continues

Run away pressure.

Replace motor control board.

repeatedly

to blink four times repeatedly

Pressure greater than

See preceding Motor control

 

 

4500 psi.

board removal procedure.

 

 

 

 

Five times

Sprayer shuts down and LED continues

Locked rotor. Motor

Clear obstruction and replace

repeatedly

to blink five times repeatedly

can not turn because

broken parts preventing motor

 

 

of some mechanical

from turning

 

 

condition.

 

 

 

 

 

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Hitachi 232133 manual Motor Control Board, Motor control board removal, Motor control board diagnostics