Alarms - Carel EVD evolution User Manual

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9.1 Alarms

There are two types of alarms:
•
system: valve motor, EEPROM, probe and communication;
•
control: low superheat, LOP, MOP, high condensing temperature, low
suction temperature.
The activation of the alarms depends on the setting of the threshold and
activation delay (timeout) parameters. Setting the timeout to 0 disables
the alarms. The EEPROM unit parameters and operating parameters alarm
always stops control.
All the alarms are reset automatically, once the causes are no longer
present. The alarm relay contact will open if the relay is confi gured as
alarm relay using the corresponding parameter. The signalling of the
alarm event on the driver depends on whether the LED board or the
display board is fi tted, as shown in the table below.
Note: the alarm LED only comes on for the system alarms, and not
for the control alarms.
Example: display system alarm on LED board:
Table of alarms
Type of alarm Cause of alarm
Probe S1 Probe S1 faulty
or exceeded set
alarm range
Probe S2 Probe S2 faulty
or exceeded set
alarm range
Probe S3 Probe S3 faulty
or exceeded set
alarm range
Probe S4 Probe S4 faulty
or exceeded set
alarm range
(LowSH) low LowSH protection
superheat activated
(LOP) low evapo- LOP protection
ration tempera- activated
ture
(MOP) high MOP protection
evaporation activated
temperature
(High Tcond) high High Tcond pro-
conden tempe- tection activated
rature
Low suction Threshold and
temperature timeout exceeded
"EVD evolution" +0300005EN - rel. 3.1 - 25.07.2011
9. ALARMS
EVD
evolution
Fig. 9.a
LED Display
red alarm ALARM fl ashing
LED
red alarm ALARM fl ashing
LED
red alarm ALARM fl ashing
LED
red alarm ALARM fl ashing
LED
- ALARM & LowSH
fl ashing
- ALARM & LOP
fl ashing
- ALARM & MOP
fl ashing
- ALARM & MOP
fl ashing
- ALARM fl ashing
Note: the alarm LED comes on to signal a mains power failure only
if the EVBAT*** module (accessory) has been connected, guaranteeing
the power required to close the valve.
The display shows both types of alarms, in two diff erent modes:
•
system alarm: on the main page, the ALARM message is displayed,
fl ashing. Pressing the Help button displays the description of the alarm
and, at the top right, the total number of active alarms.
•
control alarm: next to the fl ashing ALARM message, the main page
shows the type of protector activated.
Note:
•
to display the alarm queue, press the Help button and scroll using the
UP/DOWN buttons;
•
the control alarms can be disabled by setting the corresponding
timeout to zero.
Relay Reset Eff ect on control Checks/ solutions
Depends on automatic Depends on pa-
confi guration rameter "S1 probe
parameter alarm manag. "
Depends on automatic Depends on pa-
confi guration rameter "S2 probe
parameter alarm manag. "
Depends on automatic Depends on pa-
confi guration rameter "S3 probe
parameter alarm manag. "
Depends on automatic Depends on pa-
confi guration rameter "S4 probe
parameter alarm manag. "
Depends on automatic Protection action
confi guration already active
parameter
Depends on automatic Protection action
confi guration already active
parameter
Depends on automatic Protection action
confi guration already active
parameter
Depends on automatic Protection action
confi guration already active
parameter
Depends on automatic No eff ect
confi guration
parameter
42
Fig. 9.b
Fig. 9.c
Check the probe connections.
Check the "S1 probe alarm manag. " ,
and "S1 alarm MIN & MAX pressure"
parameters
Check the probe connections. Check
the "S2 probe alarm manag. " , and
"S2 alarm MIN & MAX temperature"
parameters
Check the probe connections.
Check the "S3 probe alarm manag. " ,
and "S3 alarm MIN & MAX pressure"
parameters
Check the probe connections. Check
the "S4 probe alarm manag. " , and
"S4 alarm MIN & MAX temperature"
parameters
Check the "LowSH alarm threshold
and timeout" parameters
Check the "LOP alarm threshold and
timeout" parameters
Check the "MOP alarm threshold and
timeout" parameters"
Check the "Hitcond alarm threshold
and timeout" parameters"
Check the threshold and timeout
parameters.