English
Electric pallet truck
EGU 14 P; EGU 22 P; EGU 30 P
F8.1.21
Design changes under reserve!
page 32
8.4. Symbols and Alarms
Three symbols inform the operator as follows:
8.4.1 Symbol of the turtles:
It shows the starting-up of the “soft” operation way of the truck, that is maximum speed and reduced
acceleration.
8.4.2 Symbol of the adjustable wrench:
It shows the request of programmed maintenance or the alarm condition, shown also by means of
the corresponding code; the piece of information given by the MDI indicator is extremely useful to the
maintenance service, because it eases the location of the possible breakdowns of the machine to the
operator himself, making in this way easier to solve the problem.
8.4.3 Symbol of the hour-glass:
When it is flashing, it means that the hour counter is working.
8.4.4 Decoding of the alarms on the MDI
By consulting the following table the operator, if the kind of alarm is not particularly serious, can solve the problem
by consulting the paragraph about alarms, in the system manual to which it is linked. Whenever the alarm results
difficult to remove, it is anyway possible to give useful information to the service centre and in this way to speed up
the servicing time, saving time and money.
AL 08 - WATCH DOG
The text is executed at the key turn-on, at the stand-by
and on running.
Possible causes:
a)
Watch-dog hardware circuit not OK,
b)
Software not OK.
AL 13 - EEPROM KO
Fault in the area of memory where the adjustment pa-
rameters are stored. This alarm inhibits machine opera-
tion. If the fault continues when the Key Switch is recy-
cled, replace the logic. If the fault disappears, the previ-
ously stored parameters will have been replaced by the
default parameters.
AL 15 - VFIELD NOT OK
This test is made at standby with the Line Contactor
open. In this condition the voltages on both the connec-
tions of field must be around 1/2 Vbatt. This alarm is
generated if the field voltage is different from this value.
Possible causes:
a)
Frame fault on the motor to chassis.
b)
Incorrect connection of the field winding.to the con-
troller.
c)
Failure of the controller in the section relative to the
field
AL 19 - LOGIC FAILURE #1
This test is carried out at the start-up: Possible cause:
failure of the logic board.
AL 32 - VMN NOT OK
This test is performed at rest, with the general Contac-
tor Closed, and also during operation. At rest if VMN is
lower than battery voltage this Alarm is generated.
During operation this Alarm is generated if VMN doesn’t
follow the duty-cycle of the Chopper.
Possible causes:
a)
Incorrect Motor connection.
b)
Short circuit motor winding to chassis
c)
Defect in the power unit
AL 37 - CONTACTOR CLOSED
This check is made during the initial diagnosis. With the
coil of the line contactor de energised, the capacitors
should not be charged, unless there is divert resistor
across the power poles.
Possible causes:
a)
The line contactor power poles are welded.
b)
This alarm could be generated even if the line con-
tactor has opened, but there is a problem with either
the field circuit, or a problem detected by the safety
microprocessor.
AL 49 - I = 0 EVER
This check is made during travel. If the current is not
higher than a pre-set minimum value, this alarm is gen-
erated and the machine is disabled.
Possible causes:
See STBY I HIGH. Check the motor armature (brush
connections).
