Emerson EXD-SH2 Operating Instructions

Operating instructions
EXD-SH1/2 Controller with ModBus communication
capability for electrical control valves
Emerson Climate Technologies GmbH www.climate.emerson.com/en-gb Date: 29.07.2020
Am Borsigturm 31 I 13507 Berlin I Germany EXD-SH12_OI_EN_DE_FR_IT_PL_RU_0720_R04_865917.docx
Preparation for Start- up:
• 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.
Setup of parameters:
(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.
Display/keypad unit: (LEDs and button functions)
Display description:
Selected main function
Superheat control
Temperature
control
Compressor
ON
Compressor
OFF
Upper display
shows
Superheat (K/F) Superheat (K/F)
Controlled
temperature
(°C/F)
Lower display
shows
Valve opening
(%)
Suction pressure
(bar/psig)
Valve opening
(%)
Note: when Superheat value is blinking, the controller is in MOP function.
Instant value display mode:
• The controller displays the values of one circuit at a time, to change from one
circuit to the other, press button (Function only for EXD-SH2).
• 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
Code on lower display
Superheat (K/F)
SH
Valve opening (%)
OPEn
Suction temperature (°C/°F)
tASP
Suction pressure (bar/psig)
PEuA
Saturation temperature (°C/°F)
tEuA
Software version: (0A)
SH1 or SH2
Repeating display of values
Parameter configuration mode:
The configuration of parameters is protected by a numerical password. The default
password is “12”. To enter the parameter configuration:
• Press both the and buttons for more than 5 seconds.
• A flashing “0” is displayed in upper and “PAS” at lower.
• Press until “12” is displayed; (password).
• Press to confirm password.
• Press or to show the code of the parameter (see table of parameter codes)
that has to be accessed/changed.
• Press to choose and adjust parameter value.
• Press or to increase or decrease the value.
• 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 to save all the new values and exit
the parameters modification procedure.
To exit and not save the new settings:
• Press and to cancel the parameter modification and delete any changes
made.
• 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).
• Note: While in parameter modification mode, the controller will display the
parameter code on the lower display and the parameter value on the upper
display.
Special manual functions: (Rest, clear)
• Press both the and buttons for more than 5 seconds.
• A flashing “0” is displayed.
• Press until “12” is displayed; (if default password has been changed, it must
select the new password)
• Press to confirm password
• Select the special function as explained at the parameter configuration mode
The special functions are:
Displayed Value
Code
Factory Reset
-Fdt
Clear Alarms (only manual reset)
ALrr
• 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.
Manual Valve operation (service /maintenance):
• Press for more than 5 seconds
Select, modify and save the variables like explained at the parameter configuration
mode
Code
Parameter description and
choices Min Max
Factory
setting
Field
setting
1Ho
Manual mode operation; circuit 1
0
1
0
0 = disabled 1 = Enabled
1HP
Valve opening (%)
0
100
0
2Ho
Manual mode operation; circuit 2
0
1
0
0 = disabled 1 = Enabled
2HP
Valve opening (%)
0
100
0
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).
Next parameter/
value (lower)
Manual Instant values
display mode active
Lower
Display
Data Display
Change 1/2
Circuit 1 is ON
Circuit 2 is ON
ON: alarm
OFF: no alarm
Upper
Display
Observing operating
parameters of
circuit1
Corresponding
valve of circuit
1 and or 2 is in
regulation
Observing operating
parameters of
circuit2
Blinking:
Valve is opening
Parameters
setting/saving
Blinking:
valve is closing
Next parameter/
value (higher)
Activating/deactivating
instant values display mode

Emerson EXD-SH2 Specifications

General

Brand	Emerson
Model	EXD-SH2
Category	Controller
Language	English