Emerson XEV EX48 User manual

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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 (314) 569-4666

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

(step/

sec)

0 Manual Setting Par Par Par Par Par

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

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.

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