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
G e n e r a l i n f o r m a t i o n :
EXD-HP1/2 are stand-alone superheat and or economizer controllers. EXD-HP1 is
intended for operation of one EXM/EXL valve whereas EXD-HP2 is designed for
operation of two independent EXM/EXL valves.
Note: It is possible to use only circuit 1 from EXD-HP2. In this case, the circuit
2 must be disabled (C2 parameter) and the sensors and the valve for the second
circuit are not needed.
ModBus communication is described in a Technical Bulletin and it is not covered
by this document.
T e c h n i c a l D a t a :
Power supply
24VAC/DC ±10%; 1A
Power consumption
EXD-HP1: 15VA EXD-HP2: 20VA
Plug-in connector
Removable screw terminals wire size 0.14...1.5 mm
2
Protection class
IP20
Digital Inputs
Potential free contacts (free from voltage)
Temperature sensors
ECP-P30
Pressure sensors
PT5
Operating/surrounding temp.
0…+55°C
Output alarm relay
SPDT contact 24V AC 1 A inductive load;
24V AC/DC 4 A resistive load
Activated/energized: During normal operation (no alarm condition)
Deactivated/de-energized: During alarm condition or power supply is OFF
Stepper motor output
Coil: EXM-125/EXL-125
Valves: EXM/EXL-…
Mounting:
For standard DIN rail
Marking
,
Dimensions (mm)
S a f e t y i n s t r u c t i o n s :
•
Read operating instructions thoroughly. Failure to comply can result in device
failure, system damage or personal injury.
•
It is intended for use by persons having the appropriate knowledge and skill.
•
Before installation or service disconnect all voltages from system and device.
•
Do not operate system before all cable connections are completed.
•
Do not apply voltage to the controller before completion of wiring.
•
Entire electrical connections have to comply with local regulations.
•
Inputs are not isolated, potential free contacts needed to be used.
•
Disposal: Electrical and electronic waste must NOT be disposed of with other
commercial waste. Instead, it is the user responsibility to pass it to a designated
collection point for the safe recycling of Waste Electrical and Electronic
Equipment (WEEE directive 2012/19/EU). For further information, contact
your local environmental recycling center.
E l e c t r i c a l c o n n e c t i o n a n d w i r i n g :
• Refer to the electrical wiring diagram for electrical connections.
• Note: Keep controller and sensor wiring well separated from supply power
cables. Minimum recommended distance 30 mm.
•
EXM-125 / EXL-125 coils are supplied with fix cable and JST terminal block at
cable end. Cut the wires close to terminal block. Remove the wire insulation
approximately 7 mm at the end. It is recommended that the wires end to be
equipped with core cable ends or metallic protective sleeve.
When connecting the
wires of EXM/EXL consider the color coding as follows:
EXD
Terminal
EXM/L-125 wire color
EXD-HP1
6
BR
7
BL
8
OR
9
YE
10
WH
Brown
Blue
Orange
Yellow
White
EXD-HP2
30
BR
31
BL
32
OR
33
YE
34
WH
Brown
Blue
Orange
Yellow
White
•
The digital input DI1 (EXD-HP1) and DI1/D12 (EXD-HP1/2) are the
interfaces between EXD-HP1/2 and upper level system controller if the
Modbus communication has not been used. The external digital shall be
operated in function system’s compressor/demand.
•
If the output relays are not utilized, the user must ensure appropriate safety
precautions are in place to protect the system.
Operating condition
Digital input status
Compressor starts/run
closed (Start)
Compressor stops
open (Stop)
Note: Connecting any EXD-HP1/2 inputs to the supply voltage will
permanently damage the EXD-HP1/2.
W i r i n g b a s e b o a r d ( E X D - H P 1 / 2 ) :
Note:
•
Base board is for function of superheat control or Economizer control.
•
Alarm relay, dry contact. Relay coil is not energized during alarm condition or
power off.
•
Hot gas discharge sensor input is mandatory only for economizer control function.
Warning: Use a class II category transformer for 24VAC power supply. Do
not ground the 24VAC lines. We recommend using individual transformers for
EXD-HP1/2 controller and for third party controllers to avoid possible
interference or grounding problems in the power supply.
