Scrub System; Functional Overview; Circuit Overview - Scrub Brush Motor M4 And M5 Run Function - Nilfisk-Advance Adphibian AX 651 Multi EDS Service Manual

Scrub System

Functional Overview

The machines use two cylindrical brushes that counter-rotate to sweep up light debris and scrub at the same time.
Each scrub brush is powered on opposing ends by 1/2 HP permanent magnet motors attached to separate poly-V belt/
pulley drives. Note that the Recovery Tank Full switch must be tilted down (tank empty, switch open) for the brushes to
run.
On all models the scrub deck platform is raised and lowered automatically by a vertically mounted electric lift actuator
motor. The operation of the machine's scrub functions are activated when the operator selects (presses) the scrub on
(mode) panel button. On the Adphibian and AX 651 Multi EDS machines, the operator can set the scrub pressure (Light
and Heavy) when the machines are in the scrub mode. Note: See the Main Control Programming Options/Selecting
the Scrub Pressure Limits section in the Electrical System portion of this manual for more detailed operation and
instructions to change scrub pressure settings.
See Figure 7. The machine's main scrub system input and output operating functions are regulated (managed) by the
display panel and combined main control board A1. The major scrub system functions are:

Circuit Overview - Scrub Brush Motor M4 and M5 Run Function

See Figure 7.
+ (Positive) Circuit input starts with:
• A closed S1 Key Switch that supplies the needed positive voltage to the K1 brush motor contactor, pin #5 - KSI (BRN
wire) on the A2 Speed Controller and pin #J2-8 (BRN wire) on the A1 Control Board. Note that the A1 control board
scrub-on button must also be depressed (enabled). This operator command lowers the brush deck.
• Once the K1 load is closed, the needed positive voltage is supplied to the motors M4 and M5 from the battery post
(WHT wire).
- (Negative) Circuit input starts with:
• Battery negative ground inputs at the A1 Control Board and A2 Speed Control Ground terminals (BLK wires). Note
that the A1 control board scrub-on button must also be depressed (enabled).
• A negative voltage output from the A2 speed controller pin #6 - Brake (-) to the A1 control board pin J1-8 For./Rev.
(RED/BLK wire) Note that the A2 speed control brake negative output (pin #6) occurs whenever the R1 direction
throttle pot is moved off its neutral setting.
• A negative voltage output from the A1 board's terminal J1-1 Brush Contactor (VIO/BLK wire) completes the K1
solenoid coil circuit (positive and negative) and pulls in the load contact making the brush motors run.
• The Negative M4 and M5 load voltage is supplied from the battery negative.
Form No. 56043116 - Adphibian™/AX 651 Multi EDS/AquaPLUS™ - 37