Operating instructions
EXD-TEVI Economizer Controller with
ModBus Communication Capability
Emerson Climate Technologies GmbH
www.emersonclimate.eu
2/3
Holzhauser Straße 180 I 13509 Berlin I Germany
Date: 19.08.2014
EXD-TEVI_OI_EN_R02_865908.docx
Preparation for Start-up:
•
Vacuum the entire refrigeration circuit.
•
EMERSON’s Electrical Control Valves EXM/EXL are delivered in partially
open position. Do not charge system with refrigerant before closure of valve.
Procedure for Valve Closure:
•
Apply supply voltage 24V to EXD-TEVI while the digital inputs (DI1 and DI2)
are Off (open). The valve(s) will be driven to close position.
•
After closure of valve, start to charge the system with refrigerant.
Setup of parameters
(need to be checked/modified before start-up):
•
Make sure that digital inputs (DI1 and DI2) are off (open).
Turn the power supply ON.
Once the main parameters have been selected/saved the EXD-TEVI is ready for
startup. All other parameters can be modified at any time during operation or
standby if it is necessary.
Procedure for parameter modification:
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
button for more than 5 seconds
•
A flashing “0” is displayed
•
Press
until “12” is displayed; (password)
•
Press
to confirm password
•
The 1
st
parameter H5 is displayed
•
Press
or
to show the code of the parameter that has to be changed
•
Press
to display the selected parameter value
•
Press
or
to increase or decrease the value
•
Press
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
to confirm the new values and exit the parameters modification
procedure.
•
To exit without modifying/saving any parameters. do not press any button for at
least 60 seconds (TIME OUT).
Reset all parameters to factory setting:
•
Make sure that digital inputs (DI1/DI2) are Off (open).
•
Press
and
together for more than 5 seconds.
•
A flashing “0” is displayed.
•
Press
or
until the password is displayed (Factory setting = 12).
If password was changed, select the new password.
•
Press
to confirm password
•
Factory setting are applied
Display System Parameters:
•
In standard mode the EVI superheat is shown at the display. In case of wet vapor
injection and economizer function this changes to discharge temperature.
•
To display other data of EXD-TEVI:
•
Press
for 3 seconds to show data
To display data: Press the
button for 1 second until index number according
to the below table appears. Release the
button and the next variable data will
appear. By repeating above procedure, variable data can be displayed in a sequence
as in following table.
Index No. Variable data
Units Source
0
Default displayed value
K
measured
1
EVI Pressure
bar measured
2
Total combination
Valves opening
%
3
EVI suction gas temp
°C
measured
4
EVI saturation temp.
°C
calculated
5
Discharge temp. 1
°C
measured
6
Discharge temp. 2
°C
measured
Note: After 3 minutes, display reverts to index 0.
Manual alarm reset/clearing functional alarms (except
hardware errors):
•
Press
and
together for 5 seconds.
When the clearing is done, “CL” message appears for 2 seconds.
List of parameters in scrolling sequence by pressing
button:
Code Parameter description and choices
Min
Max
Factory
setting
H5
Password
1
1999
12
Adr
ModBus address
1
127
1
br
Modbus baud rate
0
1
1
PAr
Modbus parity
0
1
0
tAn
Single / Tandem Operation
1
2
2
1 = single compressor, 2 = tandem compressor
1u4
Superheat control mode
0
2
1
0 = Standard;
1 = Slow;
2 = Fix PID (For trouble shooting/no warranty if system to be
operated with fix PID)
1uu
Start valve opening (%)
5
100
15
1u9
Start opening duration (second)
1
30
5
1u5
Superheat set-point (1/10 K)
0.5
30.0
7.0
1PE
Economizer control fixed PID (Kp
factor; 1/10)
0.1
10.0
2.0
For trouble shooting/no warranty if system to be operated with PID
1IE
Economizer control circuit1 (Ti factor)
1
350
100
For trouble shooting/no warranty if system to be operated with PID
1dE
Economizer control circuit1 (Td factor;
1/10)
0.1
30.0
1.0
For trouble shooting/no warranty if system to be operated with PID
1uC
Units conversion
0
1
0
0 = °C, K, bar;
1 = F, psig
1dt
Discharge temperature limit (1/100 °C) 100.0
140.0
135.0
1Lo
Load shedding valve offset
10
20
18
(Valve opening change by adding/removing compressors.
10 is no offset, 20 is 50% of current valve opening as offset)
dAd
Discharge temp. alarm delay (sec)
10
60
60
EC0
Number of installed expansion valves
1
2
1
t2E
Threshold start second valve (%)
0
50
30
Control (valve) start-up behavior (Parameter 1uu and 1u9)
1uu:
Min.: 0% (<1 sec.)
Default: 15% (< 1.5 sec.)
Max.: 100% (< 6 sec.)