Alarms And Signals; Signals; Alarms; Display Alarm Log - Carel MPXPRO User Manual

9.1 Signals

The signals are messages shown on the display to notify the user of the
control procedures in progress (e.g. defrost) or confi rm the controls from
the keypad or remote control.
Code Icon Description
--- - Probe not enabled
dEF Defrost running
Ed1 - Defrost on evaporator 1 ended by timeout
Ed2 - Defrost on evaporator 2 ended by timeout
rct - Controller enabled for programming from the remote control
Controller disabled for the programming from the remote
rcE -
control
Add - Automatic address assignment in progress
ccb - Start continuous cycle call
ccE - End continuous cycle call
dFb - Start defrost call
dFE - End defrost call
On - Switch ON
OFF - Switch OFF
Reset alarms with manual reset
rES - Reset HACCP alarms
Reset temperature monitoring
AcE - Change from PI to ON/OFF control of anti-sweat heaters
Act - Control of Slaves serving Master via tLAN
uPL - Upload procedure in progress
uS_ - Slave unit not confi gured

9.2 Alarms

There are two types of alarms:
• system: valve motor, EEPROM, communication, HACCP, high (HI and
HI2) and low (LO and LO2) temperature alarms;
• control: low superheat (LowSH), low evaporation pressure (LOP), high
evaporation pressure (MOP), low suction temperature (LSA).
The EE/EF data memory alarms shutdown the controller.
The auxiliary digital outputs AUX1 (relay 4), AUX2 (relay 5) and AUX3
(relay 2) can be confi gured to signal the alarm status, normally open or
normally closed. See paragraph 5.4. The controller indicates alarms due to
faults on the controller itself, on the probes or in network communication
between the Master and Slaves. An alarm can also be activated from an
external contact, immediate or delayed. See paragraph 5.2. The display
shows "IA" and at the same time the alarm icon (triangle) fl ashes and the
buzzer is activated. If more than one error occurs, these are displayed in
sequence.
A maximum of 10 errors can be saved, in a FIFO list (parameters HS0 to
HS9). The last error saved can be read on parameter HS0 (see the table of
parameters).
Example: display after HI error:
Fig. 9.a

9. ALARMS AND SIGNALS

• to deactivate the buzzer press Prg/mute;
• to cancel an alarm signal with manual reset, once the cause has been

9.3 Display alarm log

Procedure:
• press Prg/mute and Set together for 5 seconds;
• enter the password: 44;
• press Set to access a submenu where the UP and DOWN buttons are
• select an alarm and press Set to display the code, hour, minutes and
• from any of the child parameters, pressing Prg/mute returns to the
• press Prg/mute for 5 seconds to return to the standard display.
Example :
Tab. 9.a
'HI' -> 'h17' -> 'm23' -> '65'
indicates that alarm 'HI' (high temperature alarm) was activated at 17:23
and lasted 65 minutes.

9.4 HACCP alarms and display

(HACCP = Hazard Analysis and Critical Control Point).
HACCP allows control of the operating temperature, recording any
anomalies due to power failures or an increase in the temperature due to
other causes (breakages, extreme operating conditions, user errors, etc.).
Two types of HACCP event are managed:
• type HA alarms, high temperature during the operation;
• type HF alarms, high temperature after power failure (blackout).
When an alarm is recorded, the HACCP LED fl ashes, the display shows
the alarm code, the alarm is saved and the alarm relay and buzzer are
activated.
To display the HA and HF alarms:
• press Prg/mute and DOWN together;
• if on a Master unit, select the required network unit;
• scroll the list of alarms pressing UP and DOWN;
• press Set to select the required alarm;
• using UP or DOWN to see the description of the alarm: year, month,
• press Prg/mute again to return to the previous list.
63
Note:
resolved, press Prg/mute and UP together for 5 seconds. The message
rES will be shown as confi rmation.
used to scroll the various alarms, HS0 to HS9;
duration;
parent parameter "HSx";
Note: alternatively, access the type A parameters and select
category "HSt" = alarm log. See the table of parameters.
day, hours, minutes and duration in minutes of the selected alarm;
MPXPRO - + 0300055EN rel. 1.1 30/08/10
ENG