Circuit Overview - Solution Auto Mode (Solenoid Valve Circuit); Circuit Overview - Solution Auto Mode (Solution Pump Circuit) - Nilfisk-Advance Adphibian AX 651 Multi EDS Service Manual

Note: See the Control Panel Switch Functions sections in this manual for a complete explanation of the
solution operation modes.
During normal machine scrubbing the solution system's Auto Mode is selected and works in conjunction with the wheel
drive speed controller and the (A1) main controller's scrub system outputs to turn solenoid valves L1 and L2 and
solution pump M1 on and off. The solution will flow to the nozzle(s) when the scrub deck is lowered and the handle
drive paddle is pushed forward. Note that when the detergent system switch is off, no flow can occur while the machine
scrub deck is down and the drive paddle activated.
See the detailed drawings shown in the Control Panels section for the specific description of the individual icon
symbols.
Note: If a speed control fault occurs (error code 3) the wand indicator will flash the fault code produced by the
Curtis speed control. Refer to the Electrical/Curtis Controller Diagnostics section for details.

Circuit Overview - Solution Auto Mode (Solenoid Valve Circuit)

See Figure 6.
In order for the solution to flow to the nozzles, the
+ (Positive) circuit input starts with:
A closed S1 Key Switch that will direct the needed positive voltage (BRN wires) to the L1 and L2 solenoid coils, pin #5 -
KSI on the A2 Speed Controller and pin #J2-8 on the A1 Control Board.
- (Negative) circuit input starts with:
• Battery negative ground inputs at the A1 Control Board and A2 Speed Control Ground terminals.
• The A1 control board solution button enabled.
• A negative voltage output from the A2 speed controller's (pin #6) RED/BLK wire to the A1 control board RED/BLK
wire (terminal J1-5). Note that the A2 speed control Brake output (pin #6) occurs whenever the R1 direction throttle
pot is moved off its neutral setting.
• Negative voltage outputs from the A1 board terminals J1-2 RED/GRN wire and J1-4 YEL/GRN wire to the L1 and L2
solenoid coils respectively, actuating the solenoids to allow flow through the valve bodies.

Circuit Overview - Solution Auto Mode (Solution Pump Circuit)

See Figure 6.
+ (Positive) circuit input starts with:
A closed S1 Key Switch will direct the needed positive voltage (BRN wires) to the M1 Solution Pump, pin #5 - KSI on
the A2 Speed Controller and pin J2-8 on the A1 Control Board.
Form No. 56043116 - Adphibian™/AX 651 Multi EDS/AquaPLUS™ - 31