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
Manual alarm reset/clearing functional alarms (except hardware errors):
Press
and
together for 5 seconds. When the clearing is done, “CL”
message appears for 2 seconds.
M a n u a l m o d e o p e r a t i o n
Press
and
together for 5 seconds to access to manual mode operation.
List of parameters in scrolling sequence by pressing
button
Code
Parameter description and choices
Min
Max
Factory
setting
Field
setting
1Ho
Manual mode operation; circuit 1
0
1
0
0 = off;
1 = on
1HP
Valve opening (%)
0
100
0
2Ho
Manual mode operation; circuit 2
0
1
0
0 = off
1 = on
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).
L i s t o f p a r a m e t e r s i n s c r o l l i n g s e q u e n c e b y p r e s s i n g
b u t t o n :
Code
Parameter description and choices
Min
Max
Factory
setting
H5
Password
1
1999
12
Adr
ModBus address
1
127
1
br
Modbus baudrate
0
1
1
PAr
Modbus parity
0
1
0
-C2
Circuit 2 of EXD-HP2 enabled
0
1
0
0 = Enabled;
1 = Disabled
-uC
Units conversion
0
1
0
0 = °C, K, bar;
1 = F, psig
This Parameter effects only the display. Internally the units are allways SI-
based.
HP-
Display mode
0
2
1
EXD-HP1= 0 (not to display: - - -); 1(display)
EXD-HP2= 0 (not to display: - - -); 1 (circuit 1); 2 (circuit2)
Parameters Circuit 1
1uE
Function
0
1
1
0 = Superheat control (for 6 refrigerants);
1 = Economizer control (Only for R410A/R407C/R32)
1u4
Superheat control mode
0
2
0
0 = Standard;
1 = Slow
2 = fixed PID
1u0
Refrigerant
0
5
2
0 = R22;
1 = R134a;
2 = R410A;
3 = R32
4 = R407C;
5 = R290
1uP
Installed pressure sensor type
0
2
2
0 = PT5-07… 1 = PT5/6-18…
2 = PT5-30…
1uu
Start valve opening (%)
10
100
20
1u9
Start opening duration (second)
1
30
5
1uL
Low superheat alarm function
0
2
1
0 = disable (for flooded evaporator)
1 = enable auto reset
2 = enable manual reset
1u5
Superheat set-point (K)
If 1uL enabled (auto or manual)
If 1uL disabled
3
0.5
30
30
6
6
1u2
MOP function
0
1
1
0 = disable
1 = enable
1u3
MOP set-point (°C) saturation temperature
*
*
**
**): Factory setting according to selected refrigerant (u0):
+13°C for R22
+15°C for R134/R407C/R410A/R32/R290
*) Min./Max. settings dependent on selected type of refrigerant
1P9
Low pressure alarm mode circuit1
0
2
0
0 = disabled
1 = enabled auto reset
2 = enabled manual reset
1PA
Low pressure alarm cut-out circuit1
-0.8
17.7
0
Code
Parameter description and choices
Min
Max
Factory
setting
1Pb
Low pressure alarm delay circuit1
5
199
5
1Pd
Low pressure alarm cut-in circuit1
0.5
18
0.5
1P4
Freeze protection alarm function
0
2
0
0 = disabled,
1 = enabled auto-reset,
2 = enabled manual reset
1P2
Freeze alarm cut-out circuit1
-20
5
0
1P5
Freeze protection alarm delay, sec.
5
199
30
1P-
Superheat control circuit1 (Kp factor)
Display 1/10K
0.1
10
1.0
1i-
Superheat control circuit1 (Ti factor)
1
350
100
1d-
Superheat control circuit1 (Td factor)
Display 1/10K
0.1
30
3.0
1EC
Hotgas temperature sensor source
0
1
0
0 = ECP-P30
1 = Via Modbus input
1PE
Economizer control circuit1 (Kp factor)
Display 1/10K
0.1
10
2.0
1iE
Economizer control circuit1 (Ti factor)
1
350
100
1dE
Economizer control circuit1 (Td factor)
Display 1/10K
0.1
30
1.0
1uH
High superheat alarm mode circuit 1
0
1
0
1uA
High superheat alarm setpoint circuit 1
16
40
30
1ud
High superheat alarm delay circuit 1
1
15
3
1E2
Positive correction of measured Hotgas
temperature.
0
10
0
Parameters Circuit 2 (only EXD-HP2)
Code
Parameter description and choices
Min
Max
Factory
setting
2u4
Superheat control mode
0
2
0
0 = Standard;
1 = Slow;
2 = Fix PID
(For trouble shooting/no warranty if system to be operated with fix PID)
2u0
System Refrigerant
0
5
2
0 = R22;
1 = R134a;
2 = R410A;
3 = R32
4 = R407C;
5 = R290 (only with EXM/ EXL)
2uP
Installed pressure sensor type
(When DI2 is off)
0
3
1
0 = PT5-07…
1 = PT5/6-18…
2 = PT5-30…
2uu
Start valve opening (%)
10
100
20
2u9
Start opening duration (second)
1
30
5
2uL
Low superheat alarm function
0
2
1
0 = disable (for flooded evaporator)
1 = enable auto reset
2 = enable manual reset
2u5
Superheat set-point (K)
If 2uL enabled (auto or manual)
If 2uL disabled
3
0.5
30
30
6
6
2u2
MOP function
0
1
1
0 = disable
1 = enable
2u3
MOP set-point (°C) saturation temperature
*
*
**
**): Factory setting according to selected refrigerant (2u0):
+13°C for R22
+15°C for R134a/R407C/R410A/R32/R290
*) Min./Max. settings dependent on selected type of refrigerant
2P9
Low pressure alarm mode circuit 2
0
2
0
0 = disabled
1 = enabled auto reset
2 = enabled manual reset
2PA
Low pressure alarm cut-out (bar) circuit 2
-0.8
17.7
0
2Pb
Low pressure alarm delay (sec) circuit 2
5
199
5
