Operating instruction
EXD-HP1/2 Controller with ModBus
communication capability
Emerson Climate Technologies GmbH
Date: 17.12.2020
Am Borsigturm 31 I 13507 Berlin I Germany
EXD-HP12_OI_EN_DE_RU_1220_R06_865921.docx
Code
Parameter description and choices
Min
Max Factory
setting
2P2
Freeze alarm cut-out circuit 2
-20
5
0
2P5
Freeze protection alarm delay, sec.
5
199
30
2P-
Superheat control circuit 2
(Kp factor), fixed PID Display 1/10K
0.1
10
1.0
2i-
Superheat control circuit 2 (Ti factor),
fixed PID
1
350
100
2d-
Superheat control circuit 2 (Td factor),
fixed PID
- Display 1/10K
0.1
30
3.0
2uH
High superheat alarm mode circuit 2
0
1
0
0 = diabled
1 = enabled auto-reset
2uA
High superheat alarm setpoint (K) circuit 2
16
40
30
2ud
High superheat alarm delay (Min) circuit 2
1
15
3
Selection for both circuits and discharge tempearature control
Code
Parameter description and choices
Min
Max Factory
setting
Et
Valve type
0
1
0
0 = EXM / EXL
1 = EXN
Note: EXD-HP2 can drive two similar valves i.e. both valves must be
either EXM/EXL or EXN.
1E3
Discharge Temperature Setpoint
Start Setpoint
70
140
85
1E4
Discharge Temperature Control band
2
25
20
1E5
Discharge Temperature limit
100
150
120
M O P t a bl e (° C )
Refrigerant
Min.
Max.
Factory
setting
Refrigerant Min.
Max. Factory
setting
R22
-40
+50
+15 R452A
-45
+66
+15
R134a
-40
+66
+15 R454A
-57
+66
+10
R410A
-40
+45
+15 R454B
-40
+45
+18
R32
-40
+30
+15 R454C
-66
+48
+17
R407C
-40
+48
+15 R513A
-57
+66
+13
R290
-40
+50
+15 R452B
-45
+66
+25
R448A
-57
+66
+12 R1234ze
-57
+66
+24
R449A
-57
+66
+12 R1234yf
-52
+66
+15
C o n t r o l (v a l v e ) s t a r t - u p be h a v i o r :
(Parameter 1uu/2uu and 1u9/2u9)
1uu/2uu:
Min.: 10% (<1 sec.)
Default: 20% (< 1.5 sec.)
Max.: 100% (< 6 sec.)
U p l o a d / do w n l o a d K e y : F un 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.
U p l o a d i ng p r o c e d u r e :
(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.
D o w n l o a d i ng pr o c e d u r e :
(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.
E r r o r / A l a r m ha n d l i ng
Alarm
code
Description
Related
parameter
Alarm
relay
Valve
What to do?
Requires manual reset
after resolving alarm
1E0/2E0
Pressure sensor 1/2 error
-
Triggered Fully close Check wiring connection and measure the signal 4 to 20 mA
No
1E1/2E0
Temperature sensor 1/2 error
-
Triggered Fully close Check wiring connection and measure the resistance of sensor
No
1Ed
Discharge hot gas
temperature sensor 3 error
-
Triggered Operating Check wiring connection and measure the resistance of sensor
No
1Π
-
/2Π
-
EXM/EXL or EXN
electrical connection error
-
Triggered
-
Check wiring connection and measure the resistance of winding
No
1Ad
Discharge hot gas
temperature above limit
Triggered Operating Check valve opening/ check liquid flow for flash gas free/check
discharge hot gas temperature sensor
No
1AF/2AF
Freeze protection
1P4/2P4: 1 Triggered Fully close Check the system for cause of low pressure such as insufficient
load on evaporator
No
1AF/2AF
blinking
1P4/2P4: 2 Triggered Fully close
Yes
1AL/2AL
Low superheat
(<0,5K)
1uL/2uL: 1 Triggered Fully close
Check wiring connection and operation of valve
No
1AL/2AL
blinking
1uL/2uL: 2 Triggered Fully close
Yes
1AH/2AH
High superheat
1uH/2uH: 1 Triggered Operating Check the system
No
1AP/2AP
Low pressure
1P9/2P9: 1 Triggered Operating Check the system for cause of low pressure such as refrigerant
loss
No
1AP/2AP
blinking
1P9/2P9: 2 Triggered Operating
Yes
Err
Failed
uploading/downloading
-
-
-
Repeat again the procedure for uploading/downloading
No
Note: When multiple alarms occur, the highest priority alarm is displayed until being cleared, then the next highest alarm is displayed until all alarms are cleared. Only then will
parameters be shown again.
