Emerson EXD-SH2K Manual page 7

EXD-SH1/2 Controller with ModBus communication
C o n t r o l ( v a l v e ) s t a r t - u p b e h a v i o r f a c t o r y s e t t i n g s
(1uu + 1u9) / (2uu +2u9)
EX4/5/6 ≤ 5.3 Seconds
EX7 ≤ 5.6 Seconds
EX8 ≤ 5.9 Seconds
CV4 ≤ 5.3 Seconds
CV5/6 ≤ 5.3 Seconds
CV7 ≤ 6.6 Seconds
U p l o a d / d o w n l o a d K e y : F u n c t i o n
For serial production of systems/units, upload/download key allows the transmission
of configured parameters among range of identical systems.
Uploading procedure (storing configured parameters in key):
• Insert the key while the first (reference) controller is ON and press
"uPL" message appears followed by "End" message for 5 seconds.
• Note: If the "Err" message is displayed for failed programming, repeat the
E r r o r / A l a r m h a n d l i n g :
Alarm
Description
code
1E0/2E0 Pressure sensor circuit 1/2 error
Temperature sensor circuit 1/2
1E1/2E1
error
Valve Circuit 1/2 electrical
1Π /2Π
connection error
AFE 1/2
Freeze protection circuit 1/2
AFE 1/2
LSH 1/2
Low superheat
(<0,5K)
LSH 1/2
tAL1 Min. temperature alarm
tAH1 Max. temperature alarm
HSH 1/2 High superheat circuit 1/2
LOP 1/2
Low pressure circuit 1/2
LOP 1/2
Failed
Err
uploading/downloading
ACEr Modbus Timed Out
PFA
Power failure alarm
ACF1 or ACF2: Alarm code (circuit1/2) for "not permitted configuration/
selection" Alarm will be displayed for the following cases:
• If two circuits of the EXD-SH2 are connected to two different type of pressure
transducers i.e. 4-20 mA and 0-5 V. It is mandatory that two circuits always are
connected to the same type of pressure transmitter technology.
• Temperature control function is possible only with EX4-8 series valves. If other
valves are used, then the ACF alarm will be displayed.
• Ratiometric pressure transmitters cannot be selected in conjunction with R744.
Notes:
S e r v i c e / T r o u b l e s h o o t i n g :
Symptom
Operating superheat is several degrees higher or
lower than set-point
Operating superheat is too low i.e. compressor wet
running
Valve is not fully closed
Instable superheat (hunting)
Valve opens when EXD commands to close and
vice versa
EX8 is not able to open at high differential
pressure
Superheat set-point is shifting after several months
of uninterrupted operation or permanent jumper of
24 V digital input
Emerson Climate Technologies GmbH
Am Borsigturm 31 I 13507 Berlin I Germany
Operating instructions
capability for electrical control valves
Related Alarm
Valve
parameter relay
- Triggered Fully close Check wiring connection and measure the signal.
- Triggered Fully close Check wiring connection and measure the resistance of sensor.
- Triggered -
1P4/2P4:1 Triggered Fully close Check the system for cause of low pressure such as insufficient load on
1P4/2P4:2 Triggered Fully close
1uL/2uL:1 Triggered Fully close
1uL/2uL:2 Triggered Fully close
1tAL Triggered Fully close
1tAH Triggered Fully close
1uH/2uH:1 Triggered Operating Check the system.
1P9/2P9 1 Triggered Operating
1P9/2P9 2 Triggered Operating
- - -
- - -
- Triggered Fully close
Cause
Incorrect signal from pressure or temperature
sensors
1- Incorrect wiring of ECVs
2- Defective sensors
1- The digital input is ON
2- Wrong setting of parameter ut.
Evaporator is designed to operate at higher
superheat
Wrong wiring between EXD-SH... and valve
Wrong setting of parameter ut
Stepper motor driven valves require
synchronization
www.climate.emerson.com/en-gb
above procedure.
Downloading procedure (configured parameters from key to other controllers):
• Turn off power to new controller.
• Insert a loaded Key (with stored data from reference controller) into new controller
and turn on the power supply.
• The stored parameters of the key will be downloaded automatically into the new
controller memory; The "doL" message appears followed by a "End" message for
5 seconds.
• The new controller with new loaded parameters setting will start to operate after
"End" message disappears.
• Remove the key.
• Note: If the "Err" message is displayed for failed programming, repeat the
above procedure.
button; the
What to do?
Check wiring connection and measure the resistance of winding.
evaporator.
Check wiring connection and operation of valve.
Check wiring connection, operation of valve, size of valve and load.
Check the system for cause of low pressure such as refrigerant loss.
Repeat again the procedure for uploading/downloading.
Check Modbus communication.
active only when the pressure sensor type is configured to be Modbus type
and the corresponding circuit is on demand.
When the controller is connected to the battery supply and power supply
interrupted, this alarm code will be displayed while the valve is closing.
• When several alarms are present, the alarms will be shown one after the other
on the lower display.
• Pressure sensor error for third party ratiometric pressure transmitters is
based on detection of interruption of two wires (5 V and signal 0.5 - 4.5 V). If
only third wire (ground) is open/ interrupted, no error can be detected and
controller will receive a false signal between 50% and 100% higher. This false
signal leads to improper operation of EXD-SH1/2 controller and can lead to
system/compressor damage. EMERSON is not responsible in such cases.
1- Check the sensors (see list of parameters)
2- Make sure the sensor cables are not installed along with other high voltage
cables
1- Check the wiring
2- Check the sensor
1- Valve is shut off only when the digital input is turned off.
2- Check the setting of parameter ut.
Increase the superheat set-point.
Correct the wiring.
Check the parameter ut. (Larger valve requires higher torque and higher
current)
Do not jumper digital input permanently. Interrupt digital input once every
week for 10 seconds if compressor never stops.
EXD-SH12_OI_EN_DE_FR_IT_PL_RU_0720_R04_865917.docx
Note: Modbus alarm (ACEr) detection is
Action
Requires clear
alarm after
resolving alarm
No
No
No
No if it is ON
Yes if it is blinking
No if it is ON
Yes if it is blinking
No
No
No
No if it is ON
Yes if it is blinking
No
No
No
Date: 29.07.2020