36
Service Manual – SW5500, FLOORTEC R 985
05 - Control System
Main Machine Controller Alarm Codes (Continues)
General alarms
Alarm code
-------------------
Description
Meaning
Condition
Effect
Service Suggestions
G2
EEPROM error
EEPROM error
All functions
b
reset to default
settings
Shut down and restart the machine, if the alarm
continues, change the Main Machine Controller
(EB1)
G3
Blown main fuse or
broken line contactor
(contacts always
open)
Power circuit open (upline
fuse) = (contactor active
and V downline < 18V for
1 sec.)
All functions
blocked
Check the Main Machine Controller fuse (F1)
(change if blown).
Check the Main Machine Controller contactor
(ES1): it should close its contact a few seconds
after the machine is turned on (replace if blown)
G4
Battery voltage low
(Battery version)
B+ < 20,4 V (for WET
setting) for at least 10
sec.
All functions
blocked
Charge the batteries; if the alarm persists replace
the batteries.
B+ > di 21,6 V (for GEL/
AGM setting) for at least
10 sec.
G4
Battery voltage low
(Diesel and LPG
versions)
B+ < 24.0V for at least
300 sec. with engine
running (ALT input high)
or B+ < 19.4V (for at least
3 sec.)
All functions
blocked
Check the alternator fuse (F4) (change if blown).
Check the charging system contactor (ES10): it
should close its contacts when the drive pedal is
pressed and the drive wheel is operational.
Check the ALT output current draw while
working; it should be sufficient to keep the battery
voltage over 25-26V.
Check the batteries. Perform a charging cycle
on the batteries; if the alarm persists replace the
batteries.
G5
High voltage (Battery
version)
B+ - B- > 32V
(instantaneous)
All functions
blocked
Check the battery connections.
Could be also caused descending from heavy
slopes if the batteries are not enough capable.
If repeated change the batteries or use bigger
battery pack size.
G5
Battery voltage high
(Diesel and LPG
versions)
B+ > 33V for at least
300 sec. or B+ > 40.0V
(instantaneous)
All functions
blocked
Check the battery connections.
Check the (ES10) contactor from welded (stuck
closed) contacts.
Could be also caused descending from heavy
slopes if the batteries are not enough capable.
If repeated change the batteries or use bigger
battery pack size.
G6
Serial communication
error with Display
Controller
No communication or
communication error for at
least 1 sec.
All functions
blocked
Check the yellow and blue wires between Display
Controller (EB3) and Main Machine Controller
(EB1) J3 connector.
Check for about 5V on the blue, if not probably
the Display Controller EB3 has to be replaced.
Check for about 2.5V on the yellow, if not
probably the Main Machine Controller (EB1) has
to be replaced.
G7
CANBUS
communication error
with Drive Wheel
Controller
No communication or
communication error for at
least 30 sec.
All functions
blocked
Check the black&red twisted wires between Main
Machine Controller (EB1) J7 connector and Drive
Wheel Controller (EB2) JC connector.
G8
Line contactor fault
(contacts always
open)
B+ > 15V on ignition or B+
< 15V after activation of
output J3.5
All functions
blocked
Check the (ES1) Main Machine Controller
contactor functionality.
Also check the vacuum system motor: if it is
damaged or not connected, alarm G8 can appear
as well (because the board uses the vacuum
system motor output to draw the internal residual
energy when the machine is turned off).
