Alco Controls - Grobelny

Electronic Valve Drivers and Controllers
A2.5. /0604/E
ALCO designed a large number of electronic
controllers for most requirements of commercial
refrigeration and air-conditioning applications. They
can be grouped into stand alone and networked
products.
The stand alone controllers typically reproduce
the function of a mechanical valve, like superheator
pressure control, but offering advantages of
application of electrical control valves.
The networked controllers normally combine more
functions (superheat control, temperature control,
alarming, defrost) with network capabilities.
Stand Alone Controllers and Superheat Controllers
with WebServer functionality
EC3-X32 / -X33 Superheat Controllers control the
opening of electrical control valves according to
desired superheat. As ALCO electrical control valve
is able to provide positive shut-off function better
than conventional solenoid valve, there will be no
flow through ALCO EXV as long as the compressor
is not running. In the event of cooling request and
compressor start up, driver module needs to be
informed. This can be achieved by a digital input.
Driver module will start to control the refrigerant
mass flow stand alone by precise positioning of
the electronic expansion valve under different
operating conditions such as compressor start up,
start of further compressor, high head pressure, low
head pressure, high load, low load and partial load
operation.
Driver module is capable for diagnostics and alarm.
The alarm can be received directly from driver
module via digital output as well as optical LED on
optional Display Unit. The controllers can be started
after completion of wiring without any parameter
setting.
EXD-U Universal Drivers are stepper motor drivers.
EXD-U universal driver modules enable the operation
of ALCO stepper motor driven valves EX4/EX5/EX6/
EX7/EX8 as: Electronic expansion valve, Capacity
control by means of hot gas bypass or evaporating
pressure regulator, Crankcase pressure regulator,
Condenser pressure regulator, Liquid level and Liquid
injection.
The driver module requires an analogue input with
4 to 20mA or 0 to 0V. The output is the opening/
closing of EX4/EX5/EX6/EX7/EX8 and consequently
the control of refrigerant liquid or vapour mass flow
in accordance with analogue input. The universal
driver module can be connected to any controller
which can provide a 4-20mA or 0- 0V analogue
signal. This gives extreme flexibility to system
manufacturers to use any desired controller in
conjunction with universal driver module to achieve
different functionality.
Selection Table Universal Controllers Stand alone or with WebServer functionality
Description Stand alone TCP/IP Page
Superheat Controller for stepper motor driven electrical control valves EC3-X33 EC3-X32 28
Universal Driver Module EXD-U 29
Selection Table Electronic Controllers with Network Communication
Description FTT-10 TCP/IP Page
Display Case and Cold Room Controllers
Electronic Controller: Temperature + Superheat Control of EX2 (pressure/temperature input) EC2-35 EC2-352 30
Electronic Controller: Temperature + Superheat Control of EX2 (temperature/temperature input) EC2-3 EC2-3 2 30
Electronic Controller: Thermostat, for TXV EC2-2 EC2-2 2 30
Coldroom Controller: Thermostat + Superheat Control of EX5 .. EX8 (Stepper Motor) EC3-33 EC3-332 33
Rack- and Condenser Controllers
Condenser Controller for up to 4 Fans EC2-7 EC2-7 2 36
Condenser Controller with Fan Speed Control EC2-74 EC2-742 36
Condensing Unit Controller for 2 comps. / 2 fans, on / off control - EC2-5 2 36
Condensing Unit Controller for 2 comps. on / off contr; 0 ... 0V output for FSP Speed Control - EC2-542 36
Condenser Controller for 6 Fans + TRIAC for Fan Speed Control EC3-75 EC3-752 40
Rack Controller for 4 Compressors EC3-6 EC3-6 2 40
Rack Controller for 8 Compressors EC3-64 EC3-642 40
Rack Controller for Capacity Controlled Compressors EC3-67 EC3-672 40
Dual Rack Controller for 4 + 3 Compressors EC3-8 EC3-8 2 40
Rack & Condenser Controller, 4 Compressors + 3 Fans + TRIAC for Fan Speed Control EC3-92 EC3-922 40
Universal Controllers
With 2 digital inputs, 3 temperature inputs, 4 relay outputs EC2- EC2- 2 3
With 2 digital inputs and 2 digital outputs EC3- EC3- 2 *
* ask Alco Controls product management for more information
7