American-LincolnTechnology 9
SMART 2000 Electrical Troubleshooting Guide
Conditionsnecessaryfor Squeegee circuit tooperate
1- Battery voltage
2 - Key switch on
3 - CB-3, CB-9 , CB-11 & FU2 closed
4 - Power to the Curtis 1203A Pin 6 Keyswitch input
ToLowertheSqueegee
1 - Place the Squeegee selector Switch in the lower position.
TheSqueegeewillraisewhen
1- The Squeegeed selector Switch is placed in the middle or top position
Or
2- With the Squeegee selector Switch in the lower position & the Squeegee down then pressing the foot
pedalinreversewill raise the squeegee.
TheCurtis1203Amotor controller drives the Squeegeemotorup&down.
• Pins 1-3 on the Curtis, ResistorAssembly C-1 & RelaySPDprovide the STOP/RUN commandsto the
controller
• With relay SPD de-energized it’s contacts connect the 170 Ohm Resistor located between resistor
Assy C-1 Terminals T1 &T2 to Pin 1 & Pin 2 respectively. Any Resistance of 200 Ohms or less be
tween Pin 1 & Pin 2 Provides a STOP signal
• With Relay SPD Energized it’s contacts connect the 4.7k Ohm & the 170 Ohm resistor located in se
ries between ResistorAssy C-1 Terminals T1 &T3 to Pin1 & Pin 2 respectively. A resistance of 4.8k
Ohms or more between Pin 1 & Pin 2 Provides a full speed signal
• The three Resistors located in series between resistorAssy C-1Terminals T1 &T4 places 5.1KOhms
between Pin 1 & Pin 3. This is required at allTimes . Less than 5KOhms from Pin1 to Pin3 atANY
time is a Open circuit input & will cause the 1203A to fault & disable Squeegees operation
•RelaySPD is engergized wheneverrelay12A or relay 13A(butnot both) are energized&time
delay relay TD3 has had it’s 3 second time out.
•Relay 12A & 12B are energized when the Squeeggee Selector switch is in the lower position.
•Relay 13A is energized when the Squeeggee Selector switch is in the up or middle positions &
anytimerelay M9 is Energized
•Relayis Energized when thefootpedal is placed inreverseactivating the reverse proximity
switch.
•TD3provides a 3 seconddelay in energizing SPDon startup. This delayis required because
the Curtis controller has a high pedal startup disable feature & will NOT initialize if a Run signal
is present at startup.
•Normally closed contacts on Relay 12B complete the circuit between pins 4&5 on the Curtis controller
andprovidethe UP/DOWN directional signaltothe controller.
•With 12 B de-energized it’s N.O. contact creates a open circuit between pins 4 & pin 5 that provides a
UPdirectionalsignal
•With 12 B energized the N.O. contact closes creating a closed circuit between pins 4 & pins 5 and
providesaDowndirectionalsignal
SQUEEGEE CONTROL
