Operating instruction
EXD-HP1/2 Controller with ModBus
communication capability
Emerson Climate Technologies GmbH
Am Borsigturm 31 I 13507 Berlin I Germany
Date: 08.09.2017
EXD-HP12_OI_ML_R03_865921.docx
Code
Parameter description and choices
Min
Max
Factory
setting
2Pd
Low pressure alarm cut-in (bar) circuit 2
0.5
18
0.5
2P4
Freeze protection alarm function
0
2
0
0 = disable,
1 = enable auto-reset,
2 = enable manual reset
2P2
Freeze alarm cut-out circuit2
-20
5
0
2P5
Freeze protection alarm delay, sec.
5
199
30
2P-
Superheat control circuit2
(Kp factor), fixed PID
Display 1/10K
0.1
10
1.0
2i-
Superheat control circuit2 (Ti factor),
fixed PID
1
350
100
2d-
Superheat control circuit2 (Td factor),
fixed PID
Display 1/10K
0.1
30
3.0
2uH
High superheat alarm mode circuit 2
0
1
0
2uA
High superheat alarm setpoint (K) circuit 2
16
40
30
2ud
High superheat alarm delay (Min) circuit 2
1
15
3
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 :
(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 / 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.
U p l o a d i n g 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 n g p r 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 h a n d l i n g
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
1AΠ/2AΠ
EXM/EXL 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
AF
Freeze protection
1P4/2P4: 1 Triggered Fully close Check the system for cause of low pressure such as insufficient
load on evaporator
No
AF blinking
1P4/2P4: 2 Triggered Fully close
Yes
AL
Low superheat
(<0,5K)
1uL/2uL: 1 Triggered Fully close
Check wiring connection and operation of valve
No
AL blinking
1uL/2uL: 2 Triggered Fully close
Yes
AH
High superheat
1uH/2uH: 1 Triggered
Operating Check the system
No
AP
Low pressure
1P9/2P9: 1 Triggered
Operating Check the system for cause of low pressure such as refrigerant
loss
No
AP 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.
