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ALARMS
When an alarm is activated, the red LED in the Alarm button flashes on the display and the corresponding
alarm digital output is enabled.
A click on the Alarm button causes the last active alarm to appear on the display. All the other alarms, if any,
are scrolled ad viewed using the arrow buttons. The alarm screen below is given for the sake of exemplification.
AL70
Sonda U9 guasta
o disconnessa
AL70
U9 probe broken
or disconnected
AL70
Sonda U9 averia
o desconect.
Each alarm is identified by an “ALxx” code, where “xx” is a progressive number displayed on the top right-hand
side of the alarm screen and the alarms history.
Press the Alarm button for at least 2 seconds to reset an active alarm. If the alarm is reset, the alarms screen
disappears and the red LED in the Alarm button goes out if no other alarms are active. Please note that the
alarm can be reset exclusively if the condition causing it has been cleared.
WARNING!
An alarm should be reset manually only after checking the alarm cause and solving
the problem that caused it.
Incorrect alarm resetting may cause serious damage to the unit and its components.
The alarms history stores the last 150 active alarms. Access to the history is gained from the corresponding
menu.
Below is a list of all the alarms managed by the software, their main causes, some guidelines for their resolution,
the reset type, and service to the unit and its devices.
The type of alarm reset is described in the “RESET” column:
A = automatic, that is, when the alarm condition disappears the alarm resets automatically;
AC = automatic and controlled, i.e. the alarm is reset automatically for a number of times within a given
interval, after which it has to be reset manually;
M = manual reset using the keyboard or the supervisory control. The date and time at which the alarm
was reset are recorded for each alarm in the alarms history.
The “UNIT OFF” column indicates whether or not the alarm stops the unit:
Yes = the alarm stops the unit.
No = the alarm does not stop the unit and only disabled the concerned devices.
CODE
DESCRIPTION
MAIN CAUSE POTENTIAL
RESOLUTION OF THE PROBLEM
RESET
UNIT
OFF
DEVICES
SWITCHED
OFF
AL01
Thermal overload
switch in
compressor 1
The thermal overload switch in
compressor 1 has tripped.
Check the operating conditions.
Check the motor wiring and the power
absorption.
Check the electric motor fitted in the
compressor.
Check the discharge temperature.
Check the thermal overload switch.
M No
Compressor
1
AL02
Thermal overload
switch in
compressor 2
The thermal overload switch in
compressor 2 has tripped.
Check the operating conditions.
Check the motor wiring and the power
absorption.
Check the electric motor fitted in the
compressor.
Check the discharge temperature.
Check the thermal overload switch.
M No
Compressor
2