Emerson EC3-751 Operating Instructions

Contents:
Safety instructions:
Technical data:
Mounting
Electrical Installation
Setup and Parameter Modification
using the Keypad
Temporary Display of Data:
Note: This document contains short form instructions for experienced users.
Use last column in List of Parameters to document your individual settlings.
More detailed information can be found in the User Manual.
The EC3-751 condenser controller is a digital controller for air cooled condensers.
The condenser may consist of up to 6 fans, one of which is continuously speed
controlled. The control target is to maintain the condensing pressure at a defined
value by varying the available fan capacity.
For the measurement of the condensing pressure, a PT4 pressure sensor (3) with 4
– 20 mA interface can be connected to the controller. The condenser controller has
eight relay outputs, six to command the fans (7), one for the heat recovery solenoid
(9) and one for General Alarm. Eight digital inputs for 24V AC/DC or 230V AC
are available, six for fan serial alarm (4), one for high pressure alarm (5) and one
for heat recovery demand (6). The first fan (8) can be continuously speed
controlled by the analogue output 0 to 10V with an ALCO FSP Fan Speed
Controller or directly with the onboard TRIAC. The fan power supply must be
connected to the Triac. To meet the EMC compliance in this case, an external filter
must be fitted. Two analogue inputs (1) can be used to measure a control
temperature and the ambient temperature. A 4...20mA input (2) is reserved for the
relative humidity sensor.
The optional ECD-000 Display Unit can be connected to the EC3-751 for local
display of control parameters and for controller setup without the use of a PC.
Because the EC3-751 is fully functional without display unit the ECD-000 may be
removed at any time.
!
Safety instructions:
• Read installation instructions thoroughly. Failure to comply can result in
device failure, system damage or personal injury.
• It is intended for use by persons having the appropriate knowledge and skill.
• 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
EC3-751_65087_EN_R04.doc
EC3-751 Condenser Controller with LON Interface
1 Load Default Parameters:
1 Special Functions
1 Indications On The Display
2 Alarm Codes and Messages
Parameter List
2 Visualising Data
2
Replacement for R03
Operating Instructions
Technical Data
EC3 Series Controller
2
2
Power supply
2
2
Power consumption
3
4 Communication
Plug-in connector size
Temperature
operating
Humidity
Protection class
Pressure transmitter inputs
2 Temp. inputs for Ambient and
Control Temperature (1)
Humidity transmitter input (2)
Digital Inputs
Fan output relays
(6x) + General alarm output +
Heat recovery output
Triac rating
ECD-000 Display Unit
Power Supply
Display
LED indicators
Temp & Humidity
Protection class
Connecting cable
Mounting
The EC3-751 can be mounted onto a standard DIN rail.
The ECD-000 can be mounted in panels
with a 71x29 mm cutout. See dimensional
drawing below for space requirements
including rear connectors.
Push controller into panel cutout. (1)
Make sure that mounting lugs are flush with
outside of controller housing
Insert allen key into front panel holes and
turn clockwise. Mounting lugs will turn and
gradually move towards panel (2)
Turn allen key until mounting lug barely
touches panel. Then move other mounting
lug to the same position (3)
Tighten both sides very carefully until
display is secured. Do not over tighten as
mounting lugs will break easily.
1 / 5
24VAC ±10%; 50/60Hz; Class II
6.3mm spade earth connector
20VA max.
LON FTT10
Removable screw terminals
wire size 0.14 ... 1.5 mm
storage -20 ... +65°C
0 ... +60°C
0...80% r.h. non condensing
IP20
24VDC, 4...20mA
NTC 10 kΩ @ 25°C, -50 ... +50°C
24VDC, 4...20mA, 2 wires
24VAC/DC or 230VAC
Inductive (AC15) 250V/2A
Resistive (AC1) 250V/8A
250V AC, max. 2A
From EC3-751 via connecting cable
2½-digit red LED with decimal point
reversible between °C and °F
Controller 1, Controller 2, p bar, Alarm, IR status
Identical to EC3-751 specifications above
IP65 (front protection with gasket)
ECC-N10 (1m), ECC-N30 (3m), ECC-N50 (5m) or
CAT5 cable with RJ45 connectors
DWG Nr.: 864 915
GB
2
26.09.2007