Main Control Board Functional Overview; Main Control Board Troubleshooting Guide; Main Controller Error Codes; Functional Overview Of Main Control Board - Nilfisk-Advance Hydro-Retriever 3800 Service Manual

ELECTRICAL SYSTEM

FUNCTIONAL OVERVIEW OF MAIN CONTROL BOARD

The primary function of the main control board is to position the scrubbing brush(s) with respect to the floor surface using a lift actuator motor to
maintain the correct brush pressure and current draw of the brush motor. When the normal scrub or heavy scrub 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 specific 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 specific 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 letters Err followed
by a two-digit code. EX: Err01 would be a non-fatal control 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
Err01 Controller fault
Err02 Critical control fault
Err03 Drive system fault
Err04 Scrub deck lift actuator overload
Err05 Scrub deck lift actuator severe overload
Err06 Scrub deck lift actuator circuit open (**)
* See the Main Control Board Special Program Options section to activate the Fault Recall function.
66 - FORM NO. 56043058 Hydro-Retriever™ 3800 / 2042 / BR 1100
Fault Description Troubleshooting Action
1. Turn key switch off and back on. 2. If error fault returns, go into
the Fault Recall Mode* (Main Control Board Special Program
Options) to further investigate other possible causes. Make repairs
to all electrical system faults found in the fault recall check. Replace
control board only as the last step when troubleshooting.
Same as Err01. Check Fault Recall Mode*. Replace control
board. Follow troubleshooting actions listed for Err01.
1. Check for a tripped drive motor circuit breaker (80 amp).
Investigate reason for possible mechanical over load. Examples:
sticking brakes, parking brake slide lever not released, prolonged
ramp climbing. 2. See Curtis drive motor controller section to
further troubleshoot the drive system (Table 1).
Check for binding of brush lift linkage and excessive weight on
scrub brush deck. Repair.
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 disconnected actuator wiring, open in wiring or
defective actuator motor. Repair or replace. 2. Controller failure
(replace).
revised 12/02