Carel EVD Evolution Twin - Digital inputs; Relay outputs

ENG
“EVD Evolution TWIN” +0300006EN - rel. 2.6 - 31.01.2019
30
Digital inputs
The functions of digital inputs 1 and 2 can be set by parameter, as shown in
the table below:
Parameter/description Def. Min. Max. UOM
CONFIGURATION
DI1 conguration
1= Disabled
2= Valve regulation optimization after
defrost
3= Discharged battery alarm mana-
gement
4= Valve forced open (at 100%)
5= Regulation start/stop
6= Regulation backup
7= Regulation security
5/6 1 7 -
CONTROL
Start delay after defrost 10 0 60 min
Tab. 6.e
Valve regulation optimization after defrost: the selected digital input tells
the driver the current defrost status.
Defrost active = contact closed.
Access Manufacturer programming mode to set the start delay after defrost;
this parameter is common to both drivers.
Discharged battery alarm management: this setting can only be selected if
the controller power supply is 24 Vac. If the selected digital input is connected
to the battery charge module for EVD evolution, EVBAT00400, the controller
signals discharged or faulty batteries, so as to generate an alarm message and
warn the service technicians that maintenance is required.
Valve forced open: when the digital input closes, the valve opens completely
(100%), unconditionally. When the contact opens again the valve closes and
moves to the position dened by the parameter “valve opening at start-up” for
the pre-position time. Control can then start.
Regulation start/stop:
digital input closed: control active;
digital input open: driver in standby (see the paragraph “Control status”);
Important: this setting excludes activation/deactivation of control via
the network. See the following functions.
Regulation backup: if there is a network connection and communication
fails, the driver checks the status of the digital input to determine whether
control is active or in standby;
Regulation security: if there is a network connection, before control
is activated the driver must receive the control activation signal and the
selected digital input must be closed. If the digital input is open, the driver
always remains in standby.
Priority of digital inputs
In certain cases the setting of digital inputs 1 and 2 may be incompatible
(e.g. no regulation start/stop). The problem thus arises to determine which
function each driver needs to perform.
Consequently, each type of function is assigned a priority, primary (PRIM) or
secondary (SEC), as shown in the table:
DI1/DI2 conguration Type of function
1=Disabled SEC
2=Valve regulation optimization after defrost SEC
3=Discharged battery alarm management SEC
4=Valve forced open (at 100%) SEC
5=Regulation start/stop PRIM
6=Regulation backup PRIM
7=Regulation security PRIM
There are four possible cases of digital input congurations with primary or
secondary functions.
Driver A Driver B
Case
Function set Function performed by
digital input
Function performed by
digital input
DI1 DI2 PRIM SEC PRIM SEC
1 PRIM PRIM DI1 - DI2 -
2 PRIM SEC DI1 DI2 DI1 -
3 SEC PRIM DI2 - DI2 DI1
4 SEC SEC Regulation
backup driver
A (supervisor
variable)
DI1 Regulation
backup driver
B) (supervisor
variable)
DI2
Note that:
• if digital inputs 1 and 2 are set to perform a PRIM function, driver A performs
the function set by digital input 1 and driver B the function set by digital
input 2;
• if digital inputs 1 and 2 are set to perform a PRIM and SEC function
respectively, driver A and driver B perform the PRIM function set on digital
input DI1. Driver A will also perform the SEC function set on digital input
DI2;
• if digital inputs 1 and 2 are set to perform a SEC and PRIM function
respectively, driver A and driver B perform the PRIM function set on digital
input DI2. Driver B will also perform the SEC function set on digital input
DI1;
• if digital inputs 1 and 2 are set to perform a SEC function, driver A will
perform the SEC function set on input DI1 and driver B will perform
the SEC function set on input DI2. Each driver will be set to “Regulation
backup”, with the value of the digital input determined respectively by the
supervisor variables:
- Regulation backup from supervisor (driver A);
- Regulation backup from supervisor (driver B).
Examples
Example 1: assuming an EVD Evolution twin controller connected to the LAN.
In this case, the start/stop control will come from the network.
The two digital inputs can be congured for:
1. valve regulation optimization after defrost (SEC function);
2. regulation backup (PRIM function).
With reference to the previous table:
• in case 2, when there is no communication both driver A and driver B will
be enabled for control by digital input 1, and digital input 2 will determine
when control stops to run the defrost for driver A only;
• in case 3 when there is no communication digital input 2 will activate
control for both driver A and driver B. Digital input 1 will determine when
control stops to run the defrost for driver B only.
Example 2: assuming an EVD Evolution twin controller in stand-alone
operation. In this case, the start/stop control will come from the digital input.
The following cases are possible:
1. start / stop driver A/B from inputs DI1/DI2 (case 1);
2. simultaneous start / stop of both drivers A/B from input DI1 (case 2); input
DI2 can be used for discharged battery alarm management.
Relay outputs
The relay outputs can be congured as:
• alarm relay output. See the chapter on Alarms;
• solenoid valve control;
• electronic expansion valve status signal relay. The relay contact is only open
if the valve is closed (opening=0%). As soon as control starts (opening >0%,
with hysteresis), the relay contact is closed
Parameter/description Def.
CONFIGURATION
Relay conguration:
1= Disabled; 2= Alarm relay (open when alarm active);
3= Solenoid valve relay (open in standby); 4= Valve + alarm
relay (open in standby and control alarms)
5= Reversed alarm relay (closed in case of alarm); 6= Valve status
relay (open if valve is closed); 7 = Direct control; 8=Failed closing
alarm relay (opened with alarm); 9=Reverse failed closing alarm
relay (closed with alarm)
Alarm
relay
Tab. 6.f