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Note: This document contains short form instructions for experienced users.
Use last column in List of Parameters to document your individual settings.
More detailed information can be found in the User Manual.
The EC2-742 controller is for use in condensers with speed controlled fan(s).
Based on the input signal from a pressure transmitter (1) an analogue 0...10 V
output signal is provided, which can be used for fan speed power modules (3) as
the FSP-series from EMERSON, see following drawing:
The PT pressure transmitter (1) senses condensing pressure and feeds the signal
into a proportional control loop with proportional band (P1) around setpoint (P0).
This control loop generates a 0...10V output signal to modulate the speed of
condenser fan motor(s) (3) by using the FSP Fan Speed Power Module (10).
Digital outputs allow to switch a stage solenoid (5) and a sprinkler valve (4).
Sprinkler
Solenoid
2-stage
Solenoid
Fan
Speed
Output
P8 is the setpoint and P9 the differential to activate a sprinkler. P3 is the setpoint
and P2 the differential to activate the solenoid valve for two stage condenser
operation.
A NTC temperature sensor (2) may be attached for ambient air temperature
measurement. This can be used for setpoint floating. Depending on ambient
temperature, the condensing pressure setpoint may be lowered in a controlled way
resulting in a reduction of energy consumption of the overall system.
A fast recovery procedure can be used to immediately switch off fan(s) when the
condensing pressure falls below a set limit. Similarly an emergency routine can be
activated automatically if the condensing pressure exceeds a definable limit.
!
Safety instructions:
Read installation instructions thoroughly. Failure to comply can result in
•
device failure, system damage or personal injury.
The product is intended for use by persons having the appropriate
•
knowledge and skills.
Ensure electrical ratings per technical data are not exceeded.
•
Disconnect all voltages from system before installation.
•
Keep temperatures within nominal limits.
•
Comply with local electrical regulations when wiring
•
EC2-742_65110_EN_R03.doc
EC2-742 Condenser Controller
Condensing Pressure
Replacement for Rev.:02
Operating Instructions
Technical data:
Power supply
Power consumption
Communication
Terminals
Temperature
storage
operating
Pressure sensor input
Temperature sensor input
Condenser and sprinkler
output relays
Fan variable output signal 0 ... 10V; (3mA max)
Digital inputs
Humidity
Protection class
Mounting
The EC2-742 can be mounted in panels with a 71 x
29 mm cutout. See dimensional drawing below for
space requirements including rear connectors.
Push controller into panel cutout.(1)
Make sure that mounting clamps are flush with
outside of controller housing
Insert allen key into front panel holes and turn
clockwise. Mounting clamp will turn and gradually
move towards panel (2)
Turn allen key until mounting clamp barely touches
panel. Then move other mounting clamp to the same
position (3). Tighten both sides very carefully until
controller is secured. Do not over tighten as
mounting clamps will break easily.
Electrical Installation
Refer to the electrical wiring diagram for electrical connections. A copy of this
diagram is labelled on the controller.
Use connection wires/cables suitable for 90°C operation (EN 60730-1).
EC2 analog inputs are for dedicated sensors only and should not be connected to
any other devices. Volt free digital inputs should only be connected to serial
control loops or relays with gold contacts. They should not be connected to any
other devices
Important: Keep controller and sensor wiring well separated from mains wiring.
Minimum recommended distance 30mm.
Warning: Use a class II category transformer for 24VAC power supply
(EN 60742). Do not ground the 24VAC lines. We recommend to use one
transformer per EC2 controller and to use separate transformers for 3
controllers, to avoid possible interference or grounding problems in the power
supply. Connecting any EC2 inputs to mains voltage will permanently damage the
EC2.
1 / 4
24VAC ±10%; 50/60 Hz; Class II
4VA max.
TCP/IP Ethernet 10MBit/s
Removable screw terminals
2
wire size 0.14 ... 1.5 mm
-20 ... +65°C
0 ... +60°C
24VDC, 4 ... 20mA
NTC (10K at 25°C )
SPDT contacts, AgNi
Inductive (AC15) 250V / 2A
Resistive (AC1) 250V / 8A; 12A total return current
Volt free contacts 5V/0,1mA
0 ... 80% rh. non condensing
IP65 (front protection with gasket)
GB
rd
party
16.09.2009
Related Manuals for Emerson EC2-742
Summary of Contents for Emerson EC2-742
-
Page 1: Electrical Installation
24VDC, 4 … 20mA Temperature sensor input NTC (10K at 25°C ) The EC2-742 controller is for use in condensers with speed controlled fan(s). Condenser and sprinkler SPDT contacts, AgNi Based on the input signal from a pressure transmitter (1) an analogue 0…10 V... -
Page 2: Special Functions
EC2-742 Condenser Controller Operating Instructions Set-up and Parameter Modification Using the Keypad Indications On The Display: For convenience, an infrared receiver for the optional IR remote control unit is Condenser fan controller • build-in, enabling quick and easy modification of the system parameters when a State computer interface is not available. - Page 3 EC2-742 Condenser Controller Operating Instructions Fan controller DISPLAY PARAMETERS Min Max Unit Individ. C APPLICATION PARAMETERS Min Max Unit Individ. C6 Fan behaviour on in case of sensor failure /1 Value to be shown on display 0 = Analog output 0% (0 V)
- Page 4 EMERSON believes to be reliable and which are in compliance with technical This document replaces all former versions. Emerson Electric GmbH & Co OHG - Postfach 1251 - Heerstraße 111 - D-71332 Waiblingen - Germany - Phone .49-(0)7151-509-0 - Fax .49-(0)7151-509-200 www.emersonclimate.eu EC2-742_65110_EN_R03.doc...