Nilfisk-Advance BA 625, Service Manual

Page: 61 / 79

FORM NO. 56043098 - Convertamatic
™
24, 26, 28, 32 / BA 625, 725, 825 - 59
ELECTRICAL SYSTEM
MAIN CONTROLLER ERROR CODES
Display Code Fault Description Troubleshooting Action
03
Drive system fault. 1. Check for a tripped drive motor circuit breaker (30 amp). Investigate reason
for possible mechanical over load. Examples: Debris wrapped around the drive
wheels, defective differential and 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).
04
Scrub deck lift actuator overload.
Normal current load 1-2.5 Amps, max.
Current load 6 Amps, Max. Current no
load 1.4 Amps. 1. Check for binding or frozen brush lift linkage and excessive weight on brush deck.
2. Check for short circuits in actuator in the motor and wiring. Repair or replace.* To
test, disconnect the motor plug and attach the actuator test cord (56407502) and
perform an Amp draw test. Compare readings to the fault description table on the
left.
05
Solution pump overload.
Normal current load .8-1.8 Amps max.
Current load 3.2 Amp over will cause
05 pump motor overload. 1. Check for short circuits in wiring and pump motor. 2. Disconnect pump motor and
run the machine to see if the wiring is shorted. 3. Check the pump motor to see if it
is bad.
06
Scrub motor overload
Note: See Table #2 Scrub Pressure
for detail load current values for the
different PA#s. 1. Check for binding in rotation of brushes or improper brush Scrub Pressure lift
actuator operation. 2. Check the negative supply cable at the brush motor for a
wiring problem or improper modi
fi cations. 3. Check for an open in the small WHT/
GRA current sense wire. 4. Check to see that the proper brush programming type is
selected*** (disc or cyl). 5. Check for short circuit* in brush motor or wiring. 6. Inspect
gearbox for failure (disc). Repair or replace. 7. Inspect scrub brush drive bearings &
drive belts for excessive wear (cyl.).
07
Vacuum motor overload Normal
current load 24V 23-25 Amps. 1. Check for debris in the vacuum motor. 2. Worn carbon brushes. 3. Defective motor
bearings. 4. Check for short circuit* in vacuum motor or wiring. Repair or replace 5.
Check for an open in the small ORG current sense wire.
08
Solenoid Coil Bank Overload
Brush Solenoid Coil (K1) Overload
Vacuum Solenoid Coil (K2) Overload
Solution Solenoid Coil (L1) Overload 1. Check for wiring problems (short) on all three coil circuits and repair wiring.
2. Check resistance on all three coils. The brush, vacuum and solution coil’s nominal
spec. is 53 Ohms. If resistance is below 45 Ohms on any one coil, replace the
solenoid.
17
Scrub deck lift actuator circuit open
(**) 1. Check for disconnected actuator wiring, open in wiring or defective actuator motor.
Repair or replace. 2. Check controller output voltage, should be 24 if 0V controller
failure (replace).
18
Scrub deck lift actuator short 1. Check for binding or frozen brush lift linkage and excessive weight on brush deck.
2. Check for short circuit* in brush lift motor and wiring. Repair or replace.
21
Scrub motor circuit open (**) 1. Check for disconnected brush motors, open in wiring, defective brush motor
solenoid load contact failure. 2. Check the negative supply cable at the brush motor
for a wiring problem or improper modi
fi cations.
22
Scrub motor short Same as 06.
23
Vacuum motor circuit open (**) 1. Check for disconnected vacuum motor wiring, open in wiring, defective vacuum
motor and vacuum contactor failure.
24
Vacuum motor short Same as 07
** See Service Test Mode in this Manual for further trouble shooting information.
*** See the
Main Control Board Special Program Options section to activate the Brush Type Selection function
*Short Circuit de fi nition:
• A short circuit is a parallel path of very low resistance, often caused accidentally.
• With low resistance there is an excessive amount of current.
• The excessive current will either melt the wires or open a fusible link.
revised 8/05