Advance acoustic 56514925, Service Manual, Page: 55 / 260

Dust Control System 55 Service Manual – Advance 7765 / Nilfisk CR1500
Troubleshooting
Problem Cause Correction
Dust not being
removed effectively
from the air.
Vacuum leak(s) due to:
• Damaged panel filter or
panel filter gasket.
• Damaged hopper access
door gasket.
• Check the panel filter and gasket and replace as
necessary.
• Check the hopper access door gasket and replace
as necessary.
Dust Control Motor
not running.
The Dust Control Switch
is set to off (Wet Sweep
Bypass Option only).
Switch on the Dust Control Switch.
Circuit breaker CB6 is
tripped.
Reset the circuit breaker.
No voltage to the Main
Broom Solenoid valve.
• Check for continuity through the hopper and
hopper door “whisker” switches when the hopper
is down and the hopper door is closed. Repair the
wiring or replace the switch(es) as necessary.
• Check the Main Broom Switch function and repair/
replace as necessary.
• Check the wiring from the Main Broom Switch to
the Main Broom Solenoid valve. There should be
0 volts to the solenoid when the main broom and
dust control motors are off, and 12 VDC to the
solenoid when the motors are on.
Main Broom Solenoid valve
not operating correctly.
Check the solenoid coil resistance. If not 7.2 ohms
±10%, replace the coil. Also see the Dust Control
System Wiring Diagram .
The Shaker Motor
will not run.
Circuit breaker CB6 is
tripped.
Reset the circuit breaker.
No voltage to the Shaker
Motor Relay R1.
• Check for continuity through the hopper and
hopper door “whisker” switches when the hopper
is down and the hopper door is closed. Repair the
wiring or replace the switch(es) as necessary.
• Check the Shaker Motor Relay R1 contacts and
coil resistance. If the coil resistance is not 80-90
ohms, replace the relay.
• If there is voltage to the Shaker Motor, replace the
Shaker Motor.
Dust control motor
runs even though
the Dust Control
Switch is off (Wet
Sweep Bypass
Option only).
No voltage to the Dust
Control Solenoid (Wet
Sweep Bypass) valve.
• Check the Dust Control Switch function and repair/
replace as necessary.
• Check the wiring from the Dust Control Switch to
the Dust Control Solenoid (Wet Sweep Bypass)
valve. There should be 0 volts to the solenoid
when the dust control motor is off and 12 VDC to
the solenoid when the motor is on.
Dust Control Solenoid (Wet
Sweep Bypass) valve not
operating correctly.
Check the solenoid coil resistance. If not 7.2 ohms
±10%, replace the coil. Also see the Dust Control
System Wiring Diagram .