Emerson EXD-SH2K 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
Control (valve) start- up behavior factory settings
(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
Upload/download Key: Function
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 button; the
“uPL” message appears followed by “End” message for 5 seconds.
• Note: If the “Err” message is displayed for failed programming, repeat the
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.
Error/Alarm handling:
Alarm
code
Description
Related
parameter
Alarm
relay
Valve
What to do?
Requires clear
alarm after
resolving alarm
1E0/2E0
Pressure sensor circuit 1/2 error
-
Triggered
Fully close
Check wiring connection and measure the signal.
No
1E1/2E1
Temperature sensor circuit 1/2
error
- Triggered Fully close Check wiring connection and measure the resistance of sensor. No
1Π /2Π
Valve Circuit 1/2 electrical
connection error
- Triggered - Check wiring connection and measure the resistance of winding. No
AFE 1/2
Freeze protection circuit 1/2
1P4/2P4:1
Triggered
Fully close
Check the system for cause of low pressure such as insufficient load on
evaporator.
No if it is ON
AFE 1/2
1P4/2P4:2
Triggered
Fully close
Yes if it is blinking
LSH 1/2
Low superheat
(<0,5K)
1uL/2uL:1
Triggered
Fully close
Check wiring connection and operation of valve.
No if it is ON
LSH 1/2
1uL/2uL:2
Triggered
Fully close
Yes if it is blinking
tAL1
Min. temperature alarm
1tAL
Triggered
Fully close
Check wiring connection, operation of valve, size of valve and load.
No
tAH1
Max. temperature alarm
1tAH
Triggered
Fully close
No
HSH 1/2
High superheat circuit 1/2
1uH/2uH:1
Triggered
Operating
Check the system.
No
LOP 1/2
Low pressure circuit 1/2
1P9/2P9 1
Triggered
Operating
Check the system for cause of low pressure such as refrigerant loss.
No if it is ON
LOP 1/2
1P9/2P9 2
Triggered
Operating
Yes if it is blinking
Err
Failed
uploading/downloading
- - - Repeat again the procedure for uploading/downloading. No
ACEr
Modbus Timed Out - - -
Check Modbus communication. Note: Modbus alarm (ACEr) detection is
active only when the pressure sensor type is configured to be Modbus type
and the corresponding circuit is on demand.
No
PFA
Power failure alarm - Triggered Fully close
When the controller is connected to the battery supply and power supply
interrupted, this alarm code will be displayed while the valve is closing.
No
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:
• 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.
Service / Troubleshooting:
Symptom
Cause
Action
Operating superheat is several degrees higher or
lower than set-point
Incorrect signal from pressure or temperature
sensors
1- Check the sensors (see list of parameters)
2- Make sure the sensor cables are not installed along with other high voltage
cables
Operating superheat is too low i.e. compressor wet
running
1- Incorrect wiring of ECVs
2- Defective sensors
1- Check the wiring
2- Check the sensor
Valve is not fully closed
1- The digital input is ON
2- Wrong setting of parameter ut.
1- Valve is shut off only when the digital input is turned off.
2- Check the setting of parameter ut.
Instable superheat (hunting)
Evaporator is designed to operate at higher
superheat
Increase the superheat set-point.
Valve opens when EXD commands to close and
vice versa
Wrong wiring between EXD-SH... and valve
Correct the wiring.
EX8 is not able to open at high differential
pressure
Wrong setting of parameter ut
Check the parameter ut. (Larger valve requires higher torque and higher
current)
Superheat set-point is shifting after several months
of uninterrupted operation or permanent jumper of
24 V digital input
Stepper motor driven valves require
synchronization
Do not jumper digital input permanently. Interrupt digital input once every
week for 10 seconds if compressor never stops.

Emerson EXD-SH2K Specifications

General

Brand	Emerson
Model	EXD-SH2K
Category	Controller
Language	English