Carel EVD Evolution Twin, User Manual

Page: 51 / 68

ENG
“EVD Evolution TWIN” +0300006EN - rel. 2.6 - 31.01.2019 51
9. ALARMS
9.1 Alarms
There are two types of alarms for each driver:
•
system: valve motor, EEPROM, probe and communication;
•
control: low superheat, LOP, MOP, low suction temperature.
The activation of the alarms depends on the setting of the threshold and
activation delay parameters. Setting the delay to 0 disables the alarms. The
EEPROM alarm always shuts down the controller.
All the alarms are reset automatically, once the causes are no longer present.
The alarm relay contact will open if the relay is configured 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 fitted, 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 for driver A and for driver B
E VD
evo l ution
t w in
E VD
evo l ution
t w in
A
B A
B
Fig. 9.a
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 different modes:
system alarm
: on the main page, the ALARM message is displayed, flashing.
Pressing the Help button displays the description of the alarm and, at the
top right, the total number of active alarms and the driver where the alarm
occurred (A / B). The same alarm may occur on both drivers (e.g. probe alarm)
Superheating
4.9 K
Valve opening
44 %
OFF
ALARM
Relais
Valve motor
error
A/B A/B 1/3
Fig. 9.b
•
control alarm:
next to the flashing ALARM message, the main page shows
the type of protector activated.
Superheating
4.9 K
Valve opening
44 %
OFF
MOP
ALARM
Relais
A/B
Fig. 9.c
Note:
•
to display the alarm queue, press the Help button and scroll using the
UP/DOWN buttons. If at the end of the alarms for driver A/B the following
message is shown:
Alarms active on driver B/A
1.
press Esc to return to the standard display;
2.
press the Help and Enter buttons together to move to the corresponding
driver;
3.
press Help to display the required alarm queue.
•
the control alarms can be disabled by setting the corresponding delay to
zero.
Table of alarms
Type of alarm Cause of
the alarm LED Display Relay Reset Effects on
control Checks/ solutions
Probe S1 Probe S1 faulty
or exceeded set
alarm range red alarm
LED ALARM
flashing Depends on
configuration
parameter automatic Depends on
parameter “Probe
S1 alarm manage-
ment” Check the probe connections. Check
the “Probe S1 alarm management”, &
“Pressure S1: MINIMUM & MAXIMUM
alarm value” parameters
Probe S2 Probe S2 faulty
or exceeded set
alarm range red alarm
LED ALARM
flashing Depends on
configuration
parameter automatic Depends on
parameter “Probe
S2 alarm manage-
ment” Check the probe connections. Check
the “Probe S2 alarm management”, &
“Temperature S2: MINIMUM & MAXI-
MUM alarm value” parameters
Probe S3 Probe S3 faulty
or exceeded set
alarm range red alarm
LED ALARM
flashing Depends on
configuration
parameter automatic Depends on
parameter “Probe
S3 alarm manage-
ment” Check the probe connections. Check
the “Probe S3 alarm management”, &
“Pressure S3: MINIMUM & MAXIMUM
alarm value” parameters
Probe S4 Probe S4 faulty
or exceeded set
alarm range red alarm
LED ALARM
flashing Depends on
configuration
parameter automatic Depends on
parameter “Probe
S4 alarm manage-
ment” Check the probe connections. Check
the “Probe S4 alarm management”, &
“Temperature S4: MINIMUM & MAXI-
MUM alarm value ”
LowSH (low
superheat) LowSH protection
activated - ALARM flashing
& LowSH Depends on
configuration
parameter automatic Protection action
already active Check the “LowSH protection: thre-
shold & alarm delay” parameters
LOP (low evapora-
tion temperature) LOP protection
activated - ALARM flashing
& LOP Depends on
configuration
parameter automatic Protection action
already active Check the “Protection
LOP: threshold & alarm delay” para-
meters
MOP (high evapo-
ration tempera-
ture) MOP protection
activated - ALARM flashing
& MOP Depends on
configuration
parameter automatic Protection action
already active Check the “MOP protection: threshold
& alarm delay” parameters
Low suction
temperature Threshold and de-
lay time exceeded - ALARM
flashing Depends on
configuration
parameter automatic No effect Check the threshold and delay
parameters.