Introduction; Models; Functions And Main Characteristics - Carel EVD evolution User Manual

EVD evolution is a driver for double pole stepper motors designed
to control the electronic expansion valve in refrigerant circuits. It is
designed for DIN rail assembly and is fi tted with plug-in screw terminals.
It controls refrigerant superheat and optimises the effi ciency of the
refrigerant circuit, guaranteeing maximum fl exibility, being compatible
with various types of refrigerants and valves, in applications with chillers,
air-conditioners and refrigerators, the latter including subcritical and
transcritical CO systems. It features low superheat, high evaporation
2
pressure (MOP), low evaporation pressure (LOP) and high condensing
temperature protection, and can manage, as an alternative to superheat
control, special functions such as the hot gas bypass, the evaporator
pressure control (EPR) and control of the valve downstream of the gas
cooler in transcritical CO circuits.
2
In the versions for CAREL valves, if integrated with a specifi c CAREL pCO
controller via LAN, the driver can control one of the following:
• an electronic expansion valve in a refrigerant circuit with Emerson
Climate Technologies Digital Scroll™ compressor;
• an electronic expansion valve in a refrigerant circuit with SIAM ANB
scroll compressor. In this case the compressor must be controlled
by the CAREL Power+ speed drive (with inverter), this in turn
connected to the pCO controller.
The EVD evolution driver can control an electronic expansion valve in
a refrigerant circuit with Digital Scroll compressor, if integrated with a
specifi c CAREL controller via LAN. In addition, it features adaptive control
that can evaluate the eff ectiveness of superheat control and if necessary
activate one or more tuning procedures. Together with superheat
control, it can manage an auxiliary control function selected between
condensing temperature protection and "modulating thermostat". As
regards network connectivity, the driver can be connected to either of
the following:
•
a pCO programmable controller to manage the controller via pLAN,
tLAN and RS485/Modbus®;
•
a PlantVisorPRO supervisor via RS485/Modbus®. In this case, On/Off
control is performed via digital input 1 or 2, if suitably confi gured. As
well as regulation start/stop, digital inputs 1 and 2 can be confi gured
for the following:
-
valve regulation optimization after defrost;
-
discharged battery alarm management;
-
valve forced open (at 100%);
-
regulation backup;
-
regulation security.
The second digital input is available for optimised defrost management.
Another possibility involves operation as a simple positioner with 4 to 20
mA or 0 to 10 Vdc analogue input signal. EVD evolution comes with a LED
board to indicate the operating status, or a graphic display (accessory) that
can be used to perform installation, following a guided commissioning
procedure involving setting just 4 parameters: refrigerant, valve, pressure
probe, type of main control (chiller, showcase, etc.). The procedure can
also be used to check that the probe and valve motor wiring is correct.
Once installation is complete, the display can be removed, as it is not
necessary for the operation of the driver, or alternatively kept in place to
display the signifi cant system variables, any alarms and when necessary
set the control parameters. The driver can also be setup using a computer
via the service serial port. In this case, the VPM program (Visual Parameter
Manager) needs to be installed, downloadable from http://ksa.carel.com,
and the USB-tLAN converter EVDCNV00E0 connected.
Only on RS485/ Modbus® models can the installation procedure be
managed as described above by computer, using the serial port (see
paragraph 2.8) in place of the service serial port. The "universal" models
can drive all types of valves, while the CAREL models only drive CAREL
valves.

1. INTRODUCTION

1.1 Models

Code
EVD0000E00
EVD0000E01
EVD0000E10
EVD0000E11
EVD0000E20
EVD0000E21
EVD0000E30
EVD0000E31
EVD0000E40
EVD0000E41
EVD0000E50
EVD0000E51
EVD0002E10
EVD0002E20
(*)The codes with multiple packages are sold without connectors,
available separately in code EVDCON0021.

1.2 Functions and main characteristics

In summary:
•
electrical connections by plug-in screw terminals;
•
serial card incorporated in the driver, based on the model (tLAN, pLAN,
RS485/Modbus®);
•
compatibility with various types of valves ("universal" models only) and
refrigerants;
•
activation/deactivation of control via digital input 1 or remote control
via pLAN, from pCO programmable controller;
•
superheat control with protection functions for low superheat, MOP,
LOP, high condensing temperature;
•
adaptive superheat control;
•
function to optimise superheat control for air-conditioning units
fi tted with Emerson Climate Digital Scroll™ compressor. In this case,
EVD Evolution must be connected to a CAREL pCO series controller
running an application program that can manage units with Digital
Scroll compressors. This function is only available on the controllers for
CAREL valves;
•
confi guration and programming by display (accessory), by computer
using the VPM program or by PlantVisor/PlantVisorPro supervisor and
pCO programmable controller;
•
commissioning simplifi ed by display with guided procedure for setting
the parameters and checking the electrical connections;
•
multi-language graphic display, with "help" function on various
parameters;
•
management of diff erent units of measure (metric/imperial);
•
parameters protected by password, accessible at a service (installer)
and manufacturer level;
•
copy the confi guration parameters from one driver to another using
the removable display;
•
ratiometric or electronic 4 to 20 mA pressure transducer, the latter can
be shared between up to 5 drivers, useful for multiplexed applications;
•
possibility to use S3 and S4 as backup probes in the event of faults on
the main probes S1 and S2;
•
4 to 20 mA or 0 to 10 Vdc input to use the driver as a positioner
controlled by an external signal;
•
management of power failures with valve closing (only for drivers with
24 Vac power supply and connected to the EVBAT00400 /EVBAT00500
accessory);
•
advanced alarm management.
7
Description
EVD evolution universal - tLAN
EVD evolution universal - tLAN, multiple pack of 10 pcs (*)
EVD evolution universal - pLAN
EVD evolution universal - pLAN, multiple pack of 10 pcs (*)
EVD evolution universal - RS485/Modbus®
EVD evolution universal - RS485/Modbus®, multiple pack of
10 pcs (*)
EVD evolution for CAREL valves - tLAN
EVD evolution for CAREL valves - tLAN, multiple pack 10
pcs (*)
EVD evolution for CAREL valves - pLAN
EVD evolution for CAREL valves - pLAN, multiple pack 10
pcs (*)
EVD evolution for CAREL valves - RS485/Modbus®
EVD evolution for CAREL valves - RS485/Modbus®, multiple
pack 10 pcs
EVD evolution universal - pLAN opto-isolated
EVD evolution universal - RS485/Modbus
"EVD evolution" +0300005EN - rel. 3.1 - 25.07.2011
ENG
®
opto-isolated
Tab. 1.a