Nilfisk-Advance 56104000, Service Manual

Page: 82 / 132

Scrub System
82 Service Manual – SC1500
Scrub Brush Motor On
- +
M
S1
2 1
Bat -
Bat -
Pin 6 J3-6
24v
J3-13
Bat + Bat -
WHT/RED
BRN/VIO
BRN
RED
BLK
RED/WHT
SPST Key
Switch
Brush
Contactor
M5
Brush Motor
Brake -
K2
Brush
Contactor
A1
Control Board
E1
Curtis 1210
Speed
Controller
Motion Input (0.1v)
The following conditions must be met before the
Brush Motor
can start:
• There can be no major faults active.
• The machine must not be in a low-voltage condition.
• The Scrub System must be enabled (the Solution On/Off Indicator is lighted).
• The
S7 POS 1
limit switch on the scrub deck actuator must be closed to indicate that the scrub deck is
below the vacuum-only position.
• The
A1 Control Board
must receive a motion signal from the
E1 Curtis Speed Controller
When the Operator selects a drive direction and presses the go pedal:
• The
Brake -
switch on
Pin 6
in the
E1 Curtis Speed Controller
closes to ground. This drops the voltage on
the
Motion Input
line on pin
J3-6
from 24v down to nearly 0 volts to signal the
A1 Control Board
that the
machine is now in motion.
• The
A1 Control Board
switches the
Brush Contactor
line on pin
J3-13
to battery ground to energize the coil
side of the
K2 Brush Contactor
to close the contacts and switch on the
Brush Motor
“Field” Voltage Measurements with Reference
to Battery Negative
Pin Number Wire Color Description Voltage
J3-13 WHT/RED Brush Contactor 24.3v - Brush Motor Off
0.2v Brush Motor On