29
Service Manual – SC500
04 - Control System
Drive system alarms
Alarm on Main machine controller - FLASHING YELLOW LED
Alarm code
--------------------------
Description
No.
flashes Meaning
Condition
Effect
Service Suggestions
T2
-----------------------
DRIVE MOTOR
OVERLOAD
2
Amperometric
protection
intervention.
Drive motor current
draw greater than the
parameter (see page 35)
“INOM” for more than the
parameter (see page 35)
“TMAX”.
Drive blocked.
Check the current draw of the drive motor
(this should be around 6-8amps without
load and remain below 10-12amps during
operation).
T3
-----------------------
RELEASE THE
PADDLE !
3
Paddle not in rest
position when the
machine is turned
on.
Voltage on J1.2 of the
Display controller (EB2)
out of range 1.29V - 1.49V
with respect to - BAT.
Drive blocked.
Check that the paddle moves correctly,
lubricating if necessary; check the linkage
and potentiometer.
T4
-----------------------
PADDLE INPUT
FAILURE
4
Incorrect voltage
measured at
the paddle
potentiometer
input.
Voltage on J1.2 of the
Display controller (EB2)
above 3V.
Drive blocked.
1.
Check the connection of the
potentiometer to the Display controller.
2.
Replace the potentiometer.
3.
Replace the Display controller (EB2).
T5
-----------------------
HARDWARE
FAILURE
5
Drive system
power section
damage
MOSFET short circuit.
Drive blocked.
Disconnect M1 and M2 from controller,
press the pedal
1.
If the alarm persist replace the controller
2.
If not, check the cables of the gear
motor and motor itself for a short circuit
T6
-----------------------
DRIVE MOTOR
FAILURE
6
Overcurrent
(motor D.C.)
Drive motor current draw
greater than 1.5 times the
value of the parameter
(see page 35) “IMAX”.
Drive blocked.
1.
Check that the gear motor cables are
not short circuited
2.
Check that the motor of the gear motor
unit is not short circuited (the impedance
of the motor should be around 0.6 – 0.8
Ohm)
3.
If necessary, replace the gear motor unit
motor
T7
-----------------------
OVERHEATING
7
Drive motor drive
section thermal
cut-out.
The heatsink on the Main
machine controller has
reached a temperature of
194°F (90°C).
Drive blocked.
1.
Check the drive motor power draw
and that the openings of the electrical
compartment are not blocked.
2.
If everything is within normal
parameters, this may simply have been
caused by extreme working conditions
such as: Ambient temperature over
86°F (>30°C), sloping working sections.
Simply leave the system to cool and turn
the machine back on.
All alarms of the drive system operate by cutting the power supply to the gear motor unit motor until the
KEY input is reset (with the exception of alarm T3 which is reset as soon as the input voltage of the paddle
potentiometer returns within the values corresponding to “machine stopped”) In case of simultaneous
errors, the one with greater priority is shown first (priority order is opposite to the number of flashes).
