1592025990 XEV22D GB r1.5 14.11.2014.docx XEV22D 1/6
XEV22D
DRIVER FOR STEPPER ELECTRONIC EXPANSION
VALVES
--- MANUAL FOR RELEASE 1.5 ---
1.
GENERAL WARNING................................................................
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2. GENERAL DESCRIPTION ................................................................
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3. PROBES RELATED TO THE XEV22D ................................
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4. CONNECTIONS ................................................................
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5. FRONT PANEL ................................................................
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6. USER INTERFACE ................................................................
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7. PARAMETER LIST ................................................................
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8. FORCED OPENING ................................................................
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9. HOW TO: USE THE HOT-KEY ................................
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10. DISPLAY MESSAGES ................................................................
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11. TECHNICAL DATA ................................................................
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12. STANDARD VALUES ................................................................
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1. GENERAL WARNING
1.1 PLEASE READ BEFORE USING THIS MANUAL
This manual is part of the product and should be kept near the instrument for easy and quick
reference.
The instrument shall not be used for purposes different from those described hereunder. It
cannot be used as a safety device.
Check the application limits before proceeding.
Dixell Srl reserves the right to change the composition of its products, even without notice, ensuring the
same and unchanged functionality
1.2 SAFETY PRECAUTIONS
Check the supply voltage is correct before connecting the instrument.
Do not expose to water or moisture: use the controller only within the operating limits avoiding
sudden temperature changes with high atmospheric humidity to prevent formation of
condensation
Warning: disconnect all electrical connections before any kind of maintenance.
Fit the probe where it is not accessible by the End User. The instrument must not be opened.
In case of failure or faulty operation send the instrument back to the distributor or to “Dixell S.r.l.”
(see address) with a detailed description of the fault.
Consider the maximum current which can be applied to each relay (see Technical Data).
Ensure that the wires for probes, loads and the power supply are separated and far enough from
each other, without crossing or intertwining.
In case of applications in industrial environments, the use of mains filters (our mod. FT1) in
parallel with inductive loads could be useful.
2. GENERAL DESCRIPTION
The XEV22D module is able to drive a large variety of stepper electronic expansion valves.
XEV22D permits to regulate the superheat (SH) of the fluid that runs into refrigerating unit in order to
obtain optimized performance and a functioning of the evaporator independent by climatic or load
conditions. XEV22D modules are equipped with two probe inputs, one for 4 to 20mA or 0 to 5V
pressure transducer and another one for NTC-EU, NTC-US or Pt1000 temperature probe.
A LAN connection permits to transmit the pressure signal to others XEV modules in order to use only
one pressure transducer in multiplexed cabinet applications.
There are also two configurable digital inputs, the first one is free of voltage and the other ones is at
high voltage in order to simplify connections with cooling request signal.
With the useful display it’s possible to see the value of superheat (SH), the degree of opening of the
valve or the probe values, the local keyboard allows programming the instrument without any other
devices.
To complete instrument equipment, a RS485 serial link permits to connect XEV22D to Dixell
monitoring and supervising systems.
3. PROBES RELATED TO THE XEV22D
3.1 PP07, PP11, PP30: 4÷20MA PRESSURE TRANSDUCERS
NAME CABLE LENGTH RANGE DIXELL CODE
PP07 2,0MT -0,5+7bar rel FE BE009302 00
PP11 2,0MT -0,5+7bar rel FE BE009302 07
PP30 2,0MT 0+307bar rel FE BE009302 04
3.2 NP4-67 OR PMP4-67 PIPE MOUNTING TEMPERATURE PROBE
The NP4-67 (NTC sensor) or PMP4-67 (PT1000
sensor) temperature probe can be used on the
suction line to monitor the evaporator/Heat exchanger
outlet temperature.
NP4-67 - Code BN609001 52 - 1.5MT NTC probe
Measurement range: -40+110°C, Cable 1,5mt
PMP4-67 - Code BZ609001 53 - 1.5MT Pt1000 probe
Measurement range: -70+110°C, Cable 1,5mt
4. CONNECTIONS
The instrument is provided with pluggable screw terminal block to connect cables with a cross section
up to 2.5 mm
2
. Heat-resistant cables have to be used. Before connecting cables make sure the power
supply complies with the instrument’s requirements. Separate the probe cables from the power supply
cables, from the outputs and the power connections. Do not exceed the maximum current allowed on
each relay, in case of heavier loads use a suitable external relay.
4.1 GENERAL WARNINGS
Before connecting cables make sure the power supply complies with the instrument’s requirements.
Separate the probe cables from the power supply cables, from the outputs and the power connections.
4.2 WIRING CONNECTIONS
4.3 WIRING GUIDELINE
DEVICE TYPE SUGGESTED CABLE
Analog temp sensor and
Digital input
AWG 22-2 SHIELDED, E.I. BELDEN #8761
Rs-485 network AWG 22-2 SHIELDED, E.I. BELDEN #8761
Pressure transducer AWG 22-2 SHIELDED, E.I. BELDEN #8761
Stepper valve Use valve manufacturer’s harness with a maximum length, not
exceed 10 meters (30 feet).
Power loads and valve Allow a maximum wire size of 14 AWG (2 mm
2
)
4.4 TEMPERATURE PROBE MOUNTING
Advised temperature probe placement is
illustrated in figure nearby. Between 0 and 180
inclination degrees respect to horizontal pipe
section.
4.5 PROBE CONNECTION
4.5.1 General warnings
Pressure probe (4 - 20mA or ratiometric): respect the polarity. If using terminal ends be sure there
are no bear parts which could cause short circuiting or introduce noise disturbance at high
frequencies. To minimize the induced disturbances use shielded cables with the shield connected to
earth.
Temperature probe: it is recommended to mount the temperature probe on the outlet of the
evaporator heat/exchanger and to isolate it properly to detect the gas outlet temperature.
(90 pages)
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