Carel EVD Evolution Twin - 9.5 EEV motor alarm; 9.6 LAN error alarm

ENG
“EVD Evolution TWIN” +0300006EN - rel. 2.6 - 31.01.2019
54
In the event of LOP alarms, the driver relay will only open if congured as an
alarm relay.
Parameter/Description Def. Min. Max. UOM
CONTROL
LowSH protection: threshold 5 -40 (-72) SH set point K (°F)
LowSH protection: integral time 15 0 800 s
LOP protection: threshold -50 -60 (-76) MOP: thre-
shold
°C (°F)
LOP protection: integral time 0 0 800 s
MOP protection: threshold 50 LOP: th-
reshold
200 (392) °C (°F)
MOP protection: integral time 20 0 800 s
ALARM CONFIGURATION
Low superheat alarm delay (LowSH)
(0= alarm disabled)
300 0 18000 s
Low evaporation temperature alarm
delay (LOP)
(0= alarm disabled)
300 0 18000 s
High evaporation temperature alarm
delay (MOP)
(0= alarm disabled)
600 0 18000 s
Low suction temperature alarm
threshold
-50 -60 (-76) 200 (392) °C (°F)
Low suction temperature alarm
delay
300 0 18000 s
Tab. 9.e
9.5 EEV motor alarm
At the end of the commissioning procedure and whenever the controller is
powered up, the valve motor error recognition procedure is activated. This
precedes the forced closing procedure and lasts around 10 s. The valve is kept
stationary to allow any valve motor faults or missing or incorrect connections
to be detected. In any of these cases, the corresponding alarm is activated,
with automatic reset. The controller will go into wait status, as it can longer
control the valve. The procedure can be avoided by keeping the respective
digital input closed for each driver. In this case, after having powered up the
controller, forced closing of the valve is performed immediately.
Important: after having resolved the problem with the motor, it is
recommended to switch the controller o and on again to realign the position
of the valve. If this is not possible, the automatic procedure for synchronising
the position may help solve the problem, nonetheless correct control will not
be guaranteed until the next synchronisation.
9.6 LAN error alarm
Note: in the event of LAN error, a parameter can be set to disable
“Manual positioning”.
If the connection to the LAN network is oine for more than 6s due to an
electrical problem, the incorrect conguration of the network addresses or
the malfunction of the pCO controller, a LAN error alarm will be signalled.
The LAN error aects the operation of the controller as follows:
• case 1: unit in standby, digital input DI1/DI2 disconnected; driver A/B will
remain permanently in standby and control will not be able to start;
• case 2: unit in control, digital input DI1/DI2 disconnected: the driver will
stop control and will go permanently into standby;
• case 3: unit in standby, digital input DI1/DI2 connected: the driver will
remain in standby, however control will be able to start if the digital input
is closed. In this case, it will start with “current cooling capacity”= 100%;
• case 4: unit in control, digital input DI1/DI2 connected: driver A/B will
remain in control status, maintaining the value of the “current cooling
capacity”. If the digital input opens, the driver will go to standby and control
will be able to start again when the input closes. In this case, it will start with
“current cooling capacity”= 100%.