Emerson EC3 Series, EC3-812 Operating Instructions Manual

EC3-812 Dual Circuit Rack Controller

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 EC3-812 dual circuit rack controller is a digital controller for racks in
commercial refrigeration applications. The controller is designed for split suction
systems with a common discharge side. Typically the suction side consists of the
combination of a Low Temperature (LT) rack and a Medium Temperature (MT)
rack. The LT rack can consist of up to 3 single stage compressors and the MT rack
of up to 4 single stage compressors. For the two controllers, the control target is to
maintain the suction pressure at a defined value by varying the available
compressor capacity. For the measurement of the two suction pressures, two PT4
pressure sensors with 4 – 20 mA interface can be connected to the controller.
The rack controller has seven relays outputs to activate the compressors. Eight
digital inputs for 24V AC/DC or 230V AC and four digital inputs for 24V AC/DC
are available, seven for compressor serial alarm, two for low pressure alarm, one
for high pressure alarm, one for oil level alarm and one for refrigerant level alarm.
To control the discharge end temperature of compressor from LT rack, three
temperature inputs are available. Two analogue outputs 0 to 10 V are available to
control the first compressor of MT and LT rack with an inverter. The optional
display can show values with a decimal point in the range between -19.9 and +19.9
otherwise without decimal point. An IR receiver for the optional IR remote control
unit is build in. The supply voltage is 24 VAC. Transformers for 230V or 110V
mains supply are available as options.

!

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

•

Operating Instructions

Technical Data

EC3 Series Controller

Power supply 24VAC ±10%; 0.5A; 50/60Hz; Class II

Power consumption 20VA max.

Communication TCP/IP Ethernet 10MBit/s

Plug-in connector size Removable screw terminals

Temperatures:

storage

operating
Humidity 0…80% r.h. non condensing
Protection class IP20
Inputs Feedback failure contact for compressor B1 to B3 and

Switch

Temperature sensor
inputs

Pressure transmitter
inputs

Outputs

ECD-000 Display Unit

Power Supply From EC3 via connecting cable

Display 2½-digit red LED with decimal point

LED indicators Controller 1, Controller 2, p bar, Alarm, IR status

Temp. & Humidity Identical to EC3 specifications above

Protection class IP65 (front protection with gasket)

Connecting cable ECC-N10 (1m), ECC-N30 (3m), ECC-N50 (5m) or

6.3mm spade earth connector

2

wire size 0.14 … 1.5 mm

-20 … +65°C
0 … +60°C

A1 to A4, low-pressure alarm contact A, low-pressure
alarm contact B, high-pressure alarm contact, oil level
alarm contact and refrigerant level alarm contact
8 x 24V AC / DC or 230V AC

4 x 24V AC/DC
NTC ( 1M at 25°C for temperature input 1 to 4:

discharge temperature; 10K at 25°C for temperature
input 5 and 6)

2 x 24VDC, 4...20mA

8 x Relays SPDT

= 8A res (2A), VAC max = 250V :

I

max

Compressor relays B1 to B3, A1 to A4

reversible between °C and °F

CAT5 cable with RJ45 connectors

Mounting

The EC3 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.

GB

EC3-812_65118_EN_R00.doc Replacement for R- 1 / 5 PCN: 864916 18.03.2009

EC3-812 Dual Circuit Rack Controller

Electrical Installation

Refer to the electrical wiring diagram (below) for electrical connections. A copy of
this diagram is labeled on the controller. Use connection wires/cables suitable for
90°C operation (EN 60730-1). Ground the metal housing with a 6.3mm spade
connector.
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 EC3 controller and to use separate transformers for 3
controllers, to avoid possible interference or grounding problems in the power
supply. Connecting any EC3 inputs to mains voltage will permanently damage the
EC3.

Setup and Parameter Modification Using the Keypad of the
ECD-000

For convenience, an infrared receiver for the optional IR remote control unit is
build-in, enabling quick and easy modification of the system parameters when a
computer interface is not available.
Alternatively, the parameters can be accessed via the 4-button keypad. The
configuration parameters are protected by a numerical password. The default
password is “12”. To select the parameter configuration:

• Press the PRG button for more than 5 seconds

A flashing “0” is displayed

• Press or until 12 is displayed; (password)

• Press SEL to confirm password

The first modifiable parameter code is displayed (/1).
To modify parameters see Parameters modification below.

Parameter Modification: Procedure

• Press or to show the code of the parameter that has to be changed;

• Press SEL to display the selected parameter value;

• Press or to increase or decrease the value;

• Press SEL to temporarily confirm the new value and display its code;

• Repeat the procedure from the beginning "press or to show..."

To exit and save the new settings:

• Press PRG to confirm the new values and exit the parameters modification

procedure.

To exit without modifying any parameter:

• Do not press any button for at least 60 seconds (TIME OUT).

• Press “ESC” on IR remote control.

Wiring Diagram (controller label)

Operating Instructions

rd

party

GB

Special Functions:

The Clear Alarm function has been replaced by the Special Functions mode. The
Special Functions can be activated by:

Press

and together for more than 5 seconds.

A flashing “0” is displayed.

or until the password is displayed (default = 12). If password was

Press
changed, select the new password.
Press SEL to confirm password
A “0” is displayed and the Special Function mode is activated.

or to select the function. The number of special functions is dynamic

Press
and controller dependent. See list below.
Press SEL to activate the function without leaving the special function mode.
Press PRG to activate the function and leave the special function mode.
Most of the Special Functions work in a toggle mode, the first call activates the
function, and the second call deactivates the function.
The indication of the function can only be displayed after exiting the special
function mode.

• 0: Display test function

• 1: Displays the current TCP/IP address

• 2: Set the controller's TCP/IP address to 192.168.1.101 (default value). This

change is only temporary. A power down will reset the previous address.

• 3: Resets all parameters to the factory default setting. The controller will

indicate “oF” during the reset.

Display of Data:

The data to be permanently shown on the display can be selected by the user (parameter
/1). In case of an alarm, the alarm code is displayed alternately with the selected data.
The user can inhibit the alarm code.
It is possible to temporarily display these values. This is a useful feature when
initially setting-up the system without the aid of the LON interface. Press the SEL
button to scroll through all possible displayable data. The display will show for one
second the numerical identifier of the data (see /1 parameter) and then the selected data.
After two minutes the display will return to the by parameter /1 selected data. This
action is only valid when parameter H2 = 3.

Controller 1 LED IR LED Compressor A4 on

Service LED

Controller 2 LED

Pressure LED

Alarm LED

Compressor B3 on Compressor A1 on

Compressor B2 on Compressor A2 on

Compressor B1 on Compressor A3 on

EC3-812_65118_EN_R00.doc Replacement for R00 2 / 5 PCN: 864916 18.03.2009