American-Lincoln Technology
9
SMART 2000 Electrical Troubleshooting Guide
Conditions necessary for Squeegee circuit to operate
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
To Lower the Squeegee
1 - Place the Squeegee selector Switch in the lower position.
The Squeegee will raise when
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
pedal in reverse will raise the squeegee.
The Curtis 1203A motor controller drives the Squeegee motor up & down.
•
Pins 1-3 on the Curtis, Resistor Assembly C-1 & Relay SPD provide the STOP/RUN commands to 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 Resistor Assy 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 resistor Assy C-1 Terminals T1 &T4 places 5.1KOhms
between Pin 1 & Pin 3. This is required at all Times . Less than 5KOhms from Pin1 to Pin3 at ANY
time is a Open circuit input & will cause the 1203A to fault & disable Squeegees operation
•
Relay SPD is engergized whenever relay 12A or relay 13A (but not 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 &
anytime relay M9 is Energized
•
Relay is Energized when the foot pedal is placed in reverse activating the reverse proximity
switch.
•
TD3 provides a 3 second delay in energizing SPD on startup. This delay is 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
and provide the UP/DOWN directional signal to the controller.
•
With 12 B de-energized it’s N.O. contact creates a open circuit between pins 4 & pin 5 that provides a
UP directional signal
•
With 12 B energized the N.O. contact closes creating a closed circuit between pins 4 & pins 5 and
provides a Down directional signal
SQUEEGEE CONTROL
