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EXD-SH1/2 Controller with ModBus communication
P r e p a r a t i o n f o r S t a r t - u p :
• Vacuum the entire refrigeration circuit.
• Note: EX/CV valves are delivered partially open position. Do not charge
system with refrigerant before closure of valve.
• Apply supply voltage 24V to EXD-SH1/2 while the digital input (DI1/DI2) is open.
The valve will be driven to close position.
• After closure of valve, start to charge the system with refrigerant.
S e t u p o f p a r a m e t e r s :
(need to be checked/modified before system start-up)
• Make sure that digital input (DI1/DI2) is open. Turn on the 24V power supply to
EXD-SH1/2.
• Parameters Password (H5), type of function (1Fct), refrigerant type (1u0/2u0),
pressure sensor type (1uP/2uP) and valve scaling (1uF/2uF) need to be set
according system requirement and only when digital input DI1/DI2 is open. This
feature is for added safety to prevent accidental damage of compressors and other
system components.
• Once the main parameters have been selected and saved, the EXD-SH1/2 is ready
for startup. All other parameters can be modified at any time during operation or
in system standby, if it is necessary.
D i s p l a y / k e y p a d u n i t : ( L E D s a n d b u t t o n f u n c t i o n s )
Observing operating
Circuit 1 is ON
parameters of
Circuit 2 is ON
circuit1
Corresponding
valve of circuit
1 and or 2 is in
regulation
Blinking:
Valve is opening
Blinking:
valve is closing
Activating/deactivating
Manual Instant values
instant values display mode
display mode active
D i s p l a y d e s c r i p t i o n :
Superheat control
Compressor
ON
Upper display
Superheat (K/F)
shows
Lower display
Valve opening
shows
(%)
Note: when Superheat value is blinking, the controller is in MOP function.
I n s t a n t v a l u e d i s p l a y m o d e :
• The controller displays the values of one circuit at a time, to change from one
circuit to the other, press
• By pressing the
key, the instant value display mode can be
activated/deactivated, which allows the user to check the measured/calculated
values in real time in a sequence shown as below table:
Value on upper display
Superheat (K/F)
Valve opening (%)
Suction temperature (°C/°F)
Suction pressure (bar/psig)
Saturation temperature (°C/°F)
Software version: (0A)
Repeating display of values
Emerson Climate Technologies GmbH
Am Borsigturm 31 I 13507 Berlin I Germany
Operating instructions
capability for electrical control valves
Observing operating
parameters of
circuit2
Next parameter/
Next parameter/
value (higher)
value (lower)
Selected main function
Temperature
Compressor
OFF
Superheat (K/F)
temperature
Suction pressure
Valve opening
(bar/psig)
button (Function only for EXD-SH2).
Code on lower display
SH
OPEn
tASP
PEuA
tEuA
SH1 or SH2
www.climate.emerson.com/en-gb
P a r a m e t e r c o n f i g u r a t i o n m o d e :
The configuration of parameters is protected by a numerical password. The default
password is "12". To enter the parameter configuration:
• Press both the
• A flashing "0" is displayed in upper and "PAS" at lower.
• Press
until "12" is displayed; (password).
• Press
to confirm password.
• Press
or
that has to be accessed/changed.
• Press
to choose and adjust parameter value.
• Press
or
• Press
to temporarily confirm the new value. The selected value blinks a few
times and the display shows the next available parameter code.
• Repeat the procedure for other parameters if needed.
To exit and save the new settings:
• When all parameters where changed press
the parameters modification procedure.
To exit and not save the new settings:
• Press
and
ON: alarm
made.
OFF: no alarm
• Another way to exit without saving the changes made at the parameters is to not
press any button for at least 120 seconds (TIME OUT).
Upper
• Note: While in parameter modification mode, the controller will display the
Display
parameter code on the lower display and the parameter value on the upper
display.
Lower
Display
Special manual functions: (Rest, clear)
Data Display
• Press both the
Change 1/2
• A flashing "0" is displayed.
• Press
until "12" is displayed; (if default password has been changed, it must
select the new password)
Parameters
• Press
to confirm password
setting/saving
• Select the special function as explained at the parameter configuration mode
The special functions are:
• The default value for each variable is 0, when it set to 1 it will trigger the
corresponding function.
• The factory reset of the controller (-Fdt) is possible when digital input DI1/DI2 is
open.
control
M a n u a l V a l v e o p e r a t i o n ( s e r v i c e / m a i n t e n a n c e ) :
Controlled
• Press
for more than 5 seconds
(°C/F)
Select, modify and save the variables like explained at the parameter configuration
mode
(%)
Code Parameter description and choices
Manual mode operation; circuit 1
1Ho
0 = disabled
1HP
Valve opening (%)
Manual mode operation; circuit 2
2Ho
0 = disabled
2HP
Valve opening (%)
Note: During manual operation, functional alarms such as low superheat are
disabled. It is recommended to monitor the system operation when the
controller is operated manually. Manual operation is intended for service or
temporary operation of valve at a specific condition. After achieving the
required operation, set the parameter 1Ho and 2Ho at 0 so the controller
automatically operates the valve(s) according to its setpoint(s).
EXD-SH12_OI_EN_DE_FR_IT_PL_RU_0720_R04_865917.docx
and
buttons for more than 5 seconds.
to show the code of the parameter (see table of parameter codes)
to increase or decrease the value.
to save all the new values and exit
to cancel the parameter modification and delete any changes
and
buttons for more than 5 seconds.
Displayed Value
Factory Reset
Clear Alarms (only manual reset)
1 = Enabled
1 = Enabled
Code
-Fdt
ALrr
Factory
Field
Min Max
setting
setting
0
1
0
0
100
0
0
1
0
0
100
0
Date: 29.07.2020
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