Main Control Board Functional Overview; Main Control Board Troubleshooting Guide; Main Controller Error Codes - Nilfisk-Advance BR 850S Service Manual

ELECTRICAL SYSTEM
FUNCTIONAL OVERVIEW OF MAIN CONTROL BOARD
The primary function of the main control board E1 is to position the scrubbing brush(s) with respect to the fl oor surface using a lift actuator motor
to maintain the correct brush pressure and current draw of the brush motor(s). When either the decrease or increase scrub pressure switch is
depressed this will lower the scrub deck to the operating position and by activating the foot pedal start the brush motor. The controller is continuously
monitoring the current to the brush motor and when it senses a current draw out of the desired range it automatically raises or lowers the brush deck
by turning on the brush actuator motor. This process is repeated until the brush motor is shut off. The controller also manages the other supportive
systems such as the squeegee lift, solution on/off, and vacuum motor. Note: See the Know Your Machine system in this manual for a complete
explanation of the machine's operation.
The secondary function of the main control is to detect any system failures and display an error code on the hour meter display or store it in the main
control board's recall memory mode. The error code(s) are used to help the serviceperson determine the fault and to quickly guide in repairing a
specifi c system malfunction. Note: See the Troubleshooting Guide for further information.
An additional special feature of the main control board is to change program settings for a set of specifi c machine functions. See the Main Control
Board Special Program Options section in this manual for further information.
TROUBLESHOOTING GUIDE
Any error codes detected by main control board will be displayed on the hour meter LED display as they occur. If more than one-error exists the
display will sequence through the error codes at one-second intervals. The error display will show on the hour meter as the letter E followed by a
two-digit code. EX: E03 would be a drive system fault. When troubleshooting any "Fault Description" noted with a double asterisk (**) follow
the instructions for temporarily disabling the control boards special fault detection program. See the Main Control Board Special Program
Options section in this manual.

MAIN CONTROLLER ERROR CODES

Error Code
E03 Drive system fault
E04 Scrub deck lift actuator overload
normal current load 1 - 2.5 Amps
max. current load 6 Amps
max. current no load 1.4 Amps
E05 Squeegee lift actuator overload
normal current load 1 - 1.5 Amps
max. current load 6 Amps
max. current no load 1.4 Amps
E06 Scrub motor overload
Note: See Table #2 Scrub Pressure for detail
load current values for the different PA#s.
*** See the Main Control Board Special Program Options section to activate the Brush Type Selection function.
58 - FORM NO. 56043097 / Adgressor
Fault Description
/ BR 850S, 850CS, 950S, 950CS, 1050S, 1050CS
™
Troubleshooting Action
1. Check for a tripped drive motor circuit breaker (70 amp).
Investigate reason for possible mechanical over load. Examples:
sticking brakes, parking brake not released, prolonged ramp
climbing. 2. Observe the green fl ashing wand indicator light
(location operator panel) then see Curtis drive motor controller
section to further troubleshoot the drive system (Table 1).
1. Check for binding or frozen brush lift linkage and excessive
weight on brush deck. 2. Check for short circuit* in brush motor
and wiring. Repair or replace.
1. Check for binding or frozen squeegee lift linkage and
excessive weight on squeegee. 2. Check for short circuit* in
wiring or actuator motor. Repair or replace.
1. Check for binding in rotation of brushes or improper brush
lift actuator operation. 2. Check the negative supply cable
at the brush motor for a wiring problem or improper
modifi cations and also the small YEL/VIO current sense wire.
3. Check to see that the proper brush programming type is
selected*** (disc or cyl). 4. Check for short circuit* in brush
motor or wiring. 5. Inspect gearbox for failure (disc). Repair
or replace. 6. Check excessive belt tension and idler bearing
(cyl.).