Emerson XEV EX48 User manual

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XEV EX48 Superheat Controller
XEV EX48 Superheat Controller
with ModBus Communication Capability
Instruction Sheet
PA-00369
January 2014
11911 Adie Road P.O. Box 411400 St. Louis MO 63141 USA CUSTOMER SERVICE [phone]
XEV EX48 Driver for Emerson EX4,5,6,7,8 Electronic
Stepper Expansion Valves (-40°F to 55°F SST)
Installation and Operations Manual
1.1. General Warning
Please read the following safety precautions and warnings
before using this manual:
CAUTION!
• This manual is part of the product and should be kept
near the controller for easy and quick reference.
• The controller should not be used for purposes different
from those described in this manual. It cannot be used
as a safety device.
• Check the application limits before proceeding.
SAFETY PRECAUTIONS AND WARNINGS!
• Check that the supply voltage is correct before
connecting the controller.
• Do not expose to water or moisture: use the controller
only within the operating limits and avoid sudden
temperature changes with high humidity to prevent
condensation from forming.
• Warning! Disconnect all electrical connections before
performing any kind of maintenance.
• Mount the probe where it is not accessible by the end
user. The controller must not be opened. In case of
failure or faulty operation, send the controller back to
Emerson Climate Technologies with a detailed
description of the fault. Verify the maximum current that
can be applied to each relay (see Section 15,
Specifications).
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 main filters (our mod. FT1) in parallel with
inductive loads could be useful.
2.1. General Description
The XEV EX48 superheat controllers are factory
pre-programmed to drive the Emerson EX4,5,6,7,8*
electronic stepper expansion valves. The controller
regulates evaporator superheat (SH) to optimize
performance independent of climate or load conditions.
The XEV EX48 controllers have also been pre-set to
operate with the Emerson PT5, (4 to 20mA) pressure
transducer and the ECN-N60, NTC temperature probe.
The LAN connection transmits the pressure signal to the
other XEVs; this allows the use of only one pressure
transducer in multiplexed cabinet applications. The
controller can also have two (2) configurable digital inputs,
the first one is “dry contact” d1S and the other one is at
“high voltage” d2S to simplify connections with cooling
demand signal. With the integrated display, it is possible
to see the superheat (SH) value, the Percentage valve
opening, or the probe values; the local keyboard
enables the controller to be programmed without any
other devices. An RS485 serial link connects the
controller to other Emerson monitoring and supervising
systems, such as the Einstein “E2” with software version
2.84 and above or Xweb. * If EX7 or EX8 Valves are
used, change the “tEP” Code in Pr2 parameter setting
(see p.8)
2.2 Ordering Code for Individual Controllers
Emerson PCN Description Refrigerant
900001 XEV EX48 R404A,507,407A,
22,134a, R410A,CO2 Sub
Controllers Only
• XEV EX48 controller
• XEV electrical connectors

2.21 Ordering Codes for Complete Kits
Emerson PCN Description Refrigerant
900004 XEV EX4 KIT R404A,507,407A,22,
134a, R410A,CO2 Sub
900005 XEV EX5 KIT R404A,507,407A,22,
134a, R410A,CO2 Sub
900006 XEV EX6 KIT R404A,507,407A,22,
134a, R410A,CO2 Sub
900007 XEV EX7 KIT R404A,507,407A,22,
134a, R410A,CO2 Sub
900008 XEV EX8 KIT R404A,507,407A,22,
134a, R410A,CO2 Sub
2.22 Ordering Codes for Kits Less Valve
Emerson PCN Description Refrigerant
900003 XEV Kit Less
Valve
R404A,507,407A,22,
134a, R410A,
CO2 Sub
Kits Less Valve
• XEV EX48 controller
• XEV Electrical connectors
• EXV-M60 Valve Cable
• PT5-18M Pressure
Transducer
• PT4-M60 Transducer cable
• ECN-N60 Temperature
sensor
• 90-T40F3 24V Transformer,
40VA 60HZ 120/208/240V
The XEV-EX48 Superheat Controller comes pre-set to
specifically work with all other Emerson components listed
above. The base Controller model is the XEV22D. UL File
Number E211299.
Complete Kits
• XEV EX48 controller
• XEV Electrical connectors
• EX Valve (4,5,6,7,8)
• EXV-M60 Valve Cable
• PT5-18M Pressure
Transducer
• PT4-M60 Transducer cable
• ECN-N60 Temperature
sensor
• 90-T40F3 24V Transformer,
40VA 60HZ 120/208/240V
3.0 Wiring Connections
4.0 Valve Connections and Configuration
Note: If the high voltage Digital Input d2S (cooling demand)
is not used, then the dry contact d1S must be used for
Cooling Demand. When d1S is used some PR2 parameters
must be altered from factory default to;
i1P set to CL
i1F to CCL
i2P set op
i2F set to rl
Note: For the XEV EX48 Controller, the valve motor
parameter has been pre-adjusted to the Emerson EX valve’s
Bipolar motor.
Table 4-1 - tEP Parameter Table
From table 4-1 select the valve through the tEP parameter.
This way, you can be sure of the correct configuration
Regarding connections, use Table 4-2 as a quick reference
on the connections for the Emerson EX valves.
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tEP Model Lst
(steps*10)
uSt
(steps*10)
CPP
(mA*10)
CHd
(mA*10)
Maximum
Current
Sr
(step/
sec)
0 Manual Setting Par Par Par Par Par
1
EX4
EX5
EX6
5 75 50 10 0.9A 325
2 EX7 10 160 75 25 0.9A 325
3 EX8 10 260 80 50 0.9A 325
Connection
Numbering
Emerson
EX
4 Blue
2 Brown
3 Black
1 White
Table 4-2 - 4-Wire Valves (Bipolar)

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5.0 Absolute Maximum Power
The XEV EX48 controller is capable of driving
EX4,EX5,EX6,EX7,EX8 stepper valves; listed in Table 4-1
are the maximum values of current that the actuator can
supply to the stepper wiring. Use Minimum 20VA Class II
transformers.
NOTE: After making the connection, switch the XEV
controller OFF and ON to make sure that the valve is
positioned properly.
Download EX Valve Selection Software by going to
link below. http://www.emersonclimate.com/Documents/
ECV-Selection_R07.xls
6.2 XEV EX48 LEDS
7.0 USER INTERFACE
7.1 Read-Only Values
1. Press and release the UP arrow key.
2. The first read-only label is displayed.
3. Slide labels using the UP or DOWN arrow keys.
4. Press the SET key to see the read-only value.
To change and view the parameter, press SET.
5. To exit the fast access menu, press and
release the SET + UP arrow keys or wait for
the device timeout for 3 minutes.
7.3 Modify Superheat Setpoint
1. Press the SET key until the set point is displayed.
2. Use the UP or DOWN arrow keys to change its value.
3. Press SET to store the new value.
7.2 Superheat Setpoint
1. Press the SET key until the setpoint is
displayed.
2. To return and view the temperature, wait for
5 seconds or press the SET key again.
6.1 Keys and Functions
6.0 Front Panel
Each LED function is described in Table 6-2:
Table 6-1 shows the keys found on the front Panel of the XEV
EX48 and their corresponding functions:
Figure 6.1 - XEV EX48 Front Panel
Table 6.1 - XEV EX48 Front Panel Keys and Functions
Key Function
SET
To display and to modify the SUPERHEAT
setpoint. In programming mode, it selects
a parameter or confirms a value.
By pressing and releasing this key, you will
display the Temperature and Pressure values.
In programming mode, it scrolls through
the parameters and/or increases their values.
In programming mode, it scrolls through the
parameters and/or decreases their values.
To lock and unlock the keyboard.
To enter programming mode.
Key Combinations

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7.4 Enter “Pr1” Parameters List
7.5 Enter Pr2 Parameters List
1. Press the SET + DOWN arrow keys for about
3 seconds.
2. The device will display the first parameter in
Pr1 menu.
Only 3 parameters to set on Pr1 are Fty, oPE, SFd
Fty = Type of Refrigerant
oPE = Start Opening Percentage
SFd = Start Function Duration
1. Enter the Pr1 level menu.
2. Select Pr2 parameter and press SET.
3. The PAS label will be displayed followed by a blinking 0.
4. Insert 321 password using the UP and DOWN arrow keys.
7.6 Modify the Parameters Value
1. Enter the programming mode by pressing the
SET and DOWN arrow keys for about 3 seconds.
2. Select the required parameter.
3. Press the SET key to display its value.
4. Use the UP or DOWN arrow keys to change its value.
5. Press the SET key to store the new value and
move to the next parameter.
6. To exit, press SET + UP or wait 30 seconds without
pressing a key.
7.7 How to Assign a MODBUS Address
1. To enter the programming mode, press and
hold the SET and DOWN arrow keys together
for about 3 seconds or until the dots
at the top of the display start flashing.
2. Arrow down to PR2 and press SET to select.
3. PAS for password will display and flash.
4. Use the arrow keys to set the 321 password.
Press SET to save.
Note: If a time-out occurs while setting the password (PR2
flashes), press SET to resume entering the password
5. Use the arrow keys to scroll through and locate Nod.
Press SET. Use the arrow keys to
scroll through and locate Std. Press SET.
6. Use the arrow keys to scroll through and
locate Adr Press SET. Use the arrow keys to choose the
address number of the device. Press SET to save.
7. To exit, press the SET and UP arrow keys together or wait
15 seconds without pressing a key.
Note: The set value is stored even when the time-out expires
and ends the procedure.

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8.0 Parameters
Note: All pressure parameters are relatives or absolutes depending on the PrM parameter.

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8.0 Parameters

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8.0 Parameters

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8.0 Parameters

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8.0 Parameters
9.0 Digital Inputs
The XEV EX48 comes with two (2) digital inputs:
a voltage-free input and a high voltage input; Both can be
congured as cooling call. In this way the cooling signal can
come from the controllers with direct load outputs or via the
Controllers with voltage-free outputs. One of these inputs
must be congured as the cooling call.
11.1 Probes
The recommended temperature probe placement is illustrated
in Figure 11-1. For Suction Lines less tan 7/8” Diameter, bulb
placement should be at 12 o’clock position. For Suction lines
greater tan 7/8” Dia. The preferred bulb placement is at 4 or
8 o’clock For suction pressure probes, there is no particular
recommendation.
Temperature Sensor Must Be insulated
10.0 Forced Opening
If necessary, change the FoP parameter to force
the valve to open. For example, if FoP is set to 50
(FoP = 50),the valve will be opened at half of full
scale. To disable this function, set the FoP to default value
(FoP = not used).
The valve opening is enabled
only when CCL digital input is enabled.
11.0 Electrical Connections
The controller comes with a screw terminal
Block to connect cables with a cross section
up to 2.5 mm2. Heat-resistant cables have to be used.
Before connecting the cables, verify that the power supply
complies with the controller’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. Figure 11-1 - Recommended Temperature Probe Placement

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12.0 RS485 Serial Line
All models can be connected to the monitoring and
supervising system XWEB500.
If Mod = StD, the standard MODBUS-RTU protocol is used;
if Mod = AdU, the custom XWEB library is required. This
last configuration makes it possible to use the same serial
address of the thermostat that gives the cooling request
to XEV. In this way, it is possible to reduce the number of
addresses used.
13.1 How to Program a Hot Key From the
Controller (Upload)
1. Program one controller using the front keypad.
2. When the controller is ON, insert the Hot Key
and press the UP arrow key; the uPL message will
appear followed by a flashing End LED.
3. Push the SET key and the End LED will stop flashing.
4. Turn OFF the controller, remove the Hot Key,
then turn it ON again.
Note: The Err message is displayed in case an error or
failure in programming occurs. In this case, push the UP
arrow key again if you want to restart the upload or remove
the Hot Key to abort the operation.
13.2 How to Program the Controller Using a Hot
Key (Download)
1. Turn OFF the controller.
2. Insert a programmed Hot Key into the 5-pin connector
and then turn the controller ON.
3. Automatically the parameter list of the Hot
Key is downloaded into the controller memory, the doL
message will blink followed by a flashing End LED.
4. After 10 seconds, the controller will restart work with the
new parameters.
5. Remove the Hot Key.
Note: The Err message is displayed in case an error or
failure in programming occurs. In this case, turn the unit OFF
and then ON if you want to restart the download or remove
the Hot Key to abort the operation.
13.0 How to Use the Hot Key
14.0 Display Messages
14.1 Alarm Recovery
Probe alarms P1 and P2 start a few seconds after
the fault in the probe; they automatically stop few
secondsafter the probe restarts normal operation. Check
the connections before replacing the probe. Maximum and
minimum alarms HSH, LSH, MoP, and LoP automatically
stop as soon as the variable returns to normal values.
The controller is provided with an internal check
to verify memory integrity. Alarm EE flashes when a failure in
the internal memory is detected. In this case, call for service.