Service Manual: SC750, SC800, SC 750 ST, SC800 ST
Form Number 56043150 Page 18
Control system
Functional Description
There are two controllers on the machine, a Main Machine Controller and a Drive Motor Controller.
The Main Machine Controller operates the oor cleaning funcons of scrub, soluon and vacuum based on operator
requests and other inputs. It is located directly behind the operator control panel. It is capable of storing and display-
ing many fault codes. In addion to fault codes, it supports special modes of operaon called “Programming Mode” and
“Service Test Mode”. The programming mode is used primarily for “telling” the controller how the machine is equipped
so that it can operate accordingly. The service test mode is a powerful and convenient diagnosc feature that allows a
technician to request specic outputs to operate regardless of current inputs.
The Drive Motor Controller (Speed Controller) operates the drive motor that propels the machine based on operator
requests. (See the secon on Wheel System, Drive for more informaon)
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