SIEBE Eliwell EWPX 193

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GENERAL DESCRIPTION

EWPX 193(/E) is a single point temperature

controller designed for applications in the

field of commercial refrigeration.

The instrument provides three input

probes for temperature control, defrost

control for the first and the second evapo-

rator. Four relay outputs are provided for

the compressor, the defrost systems of the

first and second evaporator, and the evap-

orator fans.

As a standard feature it can be connected

to the TELEVIS system (through its appro-

priate interface module). The “/E” version

can also be connected to the EWPX

ECHO data repeater, which allows remote

display of the temperature measured by

the instrument.

The instrument can be configured accord-

ing to the application through a series of

parameters - it is supplied in the new

32x74 mm cabinet (ELIWELL Standard).

COMMANDS ON FRONT PANEL

The instrument is provided with two keys:

“UP” and “SET/DOWN”.

SET/DOWN: by pressing and releasing it

the Setpoint is displayed, the “SET” led is

turned on.

To change the Setpoint value use the “UP”

and “SET/DOWN” keys within 5 seconds.

If no operation is performed for more than

5 seconds normal mode is restored and

the new value is automatically acquired.

The same button is used to increase val-

ues during Setpoint change or parameters

programming. When held pressed a fast

increase is performed.

UP: button used for value increase, used

to change both the Setpoint and the para-

meters. A fast increase is obtained by

holding it pressed.

This key also allows manual start of the de-

frost cycle, by holding it pressed for more

than 5 seconds (this function is not en-

abled during Setpoint or parameter pro-

gramming; please refer to paragraph

“Controlling Defrost”.

During the manual defrost cycle the “DE-

FROST” led will blink.

“COMPRESSOR” Led: led related to the

compressor relay; it is on when the com-

pressor works.

“SET” Led: it is on during Setpoint display

and programming; it blinks during parame-

ter programming.

“DEF” Led: status light of the defrost. It is

on during automatic defrost; it blinks dur-

ing manual defrost.

“ALARM” Led: led related to the alarm. It

is on when the alarm is active or disabled

due to the exclusion time (see parameters

“PAO”, “dAo” and “tAo”); it blinks when the

alarm is silenced.

DISPLAYING AND SETTING THE

SETPOINT

To display the Setpoint value press and re-

lease “SET/DOWN”; the Setpoint value is

displayed and the “SET” led is turned on.

To change the Setpoint value operate on

keys “UP” and “SET/DOWN” within 7 sec-

onds; after such time normal mode will be

restored.

CONTROLLING DEFROST

The instrument can control defrost in two

different evaporators. The trigger call to the

defrost outputs is simultaneous both in

case of manual control and in case of in-

terval end. To enable the outputs the tem-

perature detected by the probe on each

evaporator shall be below its defrost end

temperature (parameters “dSt” and

“AAS”); therefore defrost may take place in

one evaporator only.

Output disable is related to the end defrost

temperature on each probe, therefore may

be not simultaneous.

Defrost is considered over (the defrost in-

terval starts and the dripping begins, etc.)

when both outputs are disabled.

MANUAL ACTIVATION OF THE

DEFROST CYCLE

The manual activation of the defrost cycle

starts by holding the “UP” key pressed for

more than 7 seconds (the key is not active

during Setpoint or parameter program-

ming). In case the conditions for defrost

are not suitable in both evaporators (e.g.

the temperature of both the evaporator

probes exceeds the end defrost tempera-

ture), the blinking label “dFu” (defrost un-

able) will be displayed.

During manual defrost the “DEFROST” led

blinks.

SILENCING THE ALARM

An alarm condition is signalled by the

“ALARM” led.

The alarm can be silenced by pressing any

key on the front panel; the led will blink un-

til the end of the alarm condition.

DISPLAYING PROBE VALUES

The instrument provides two probe inputs:

temperature control and defrost manage-

ment.

The pressure and release of the “UP” and

HOW IT IS MADE

•Housing: plastic resin PC+ABS ex-

tinguishing grade V0

•Size: front panel 76x34 mm, depth

58 mm

•Mount: panel mount on 71x29 mm

hole

•Protection: front IP65

•Connections: on screw terminal

block for wires max 2.5 mm

(one

wire only per block in compliance

with VDE regulations)

•Remote connection: serial con-

nection to the EWPX ECHO re-

peater (version /E only)

•Serial connection: TTL port for the

connection to the EWRS 485 inter-

face for TELEVIS system linking

•Display: 3 digit plus “-” sign; digit

height 12.5 mm

•Main outputs: 1 on N.O. 8(3)A

250V AC relay for the compressor,

2 on N.O. 5(2)A 250V AC relay for

the fans and defrost system of the

first evaporator

•Second evaporator output: 1 out-

put on N.O. 8(3)A 250V AC relay

•Analogue inputs: three NTC

probes for temperature control

and defrost management (first

evaporator and second evapora-

tor)

•Resolution: 1 °C, 0.1 °C, or 0.5 °C,

selectable through parameters

•Consumption: 3VA (5 VA in the

“/E” version with the EWPX ECHO

module connected)

•Power supply: 12 Vac/dc ±15%

WHAT IT IS

EWPX 193(/E) is a single point tem-

perature controller designed for ap-

plications in the field of commercial

refrigeration.

The instrument provides three input

probes for temperature control, de-

frost control for the first and the

second evaporator.

Four relay outputs are provided for

the compressor, the defrost sys-

tems of the first and second evapo-

rator, and the evaporator fans.

EWPX 193(/E)

rel. 11/97 ing

controller for refrigerating units

with double evaporator

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Summary

What It Is

How It Is Made

General Description

Commands on Front Panel

SET;DOWN Key

Used for displaying Setpoint and changing it. Also used for parameter programming.

UP Key

Used for increasing values during Setpoint and parameter changes, and manual defrost activation.

Compressor LED

Indicates when the compressor relay is active.

SET LED

Indicates Setpoint display/programming and blinks during parameter programming.

DEF LED

Indicates automatic or manual defrost status.

ALARM LED

Signals alarm conditions and blinks when silenced.

Displaying and Setting the Setpoint

Controlling Defrost

Manual Activation of Defrost Cycle

Silencing the Alarm

Displaying Probe Values

Keyboard Locking

Password for Parameter Programming

Parameters Programming

Parameters Description

diF: Differential

Setpoint intervention differential for compressor control.

LSE: Lower Setpoint

Minimum value that can be assigned to the Setpoint.

HSE: Higher Setpoint

Maximum value that can be assigned to the Setpoint.

dty: Defrost Type

Defines the defrost type: electric defrost or cycle inversion defrost.

dit: Defrost Interval Type

Sets the defrost interval in hours or minutes.

dct: Defrost Counting Type

Determines how the defrost interval is counted (e.g., DIGIFROST or real time).

doh: Defrost Offset Hour

Sets a delay time in minutes before defrost starts.

dEt: Defrost Endurance Time

Defines the maximum duration for the defrost cycle in minutes.

dSt: Defrost Stop Temperature

Sets the temperature at which defrost for the first evaporator ends.

FSt: Fan Stop Temperature

Stops fans when the temperature measured by the defrost probe exceeds a set value.

Fdt: Fan Delay Time

Sets a delay time in minutes for fan start after defrost.

dt: Drainage Time

Specifies the dripping time in minutes after defrost.

dPo: Defrost at Power-on

Determines if defrost is activated upon instrument startup.

ddL: Defrost Display Lock

Controls how the display shows temperature during defrost.

dFd: Defrost Fan Disable

Allows selection to disable the fan during defrost.

APS: Alarm Probe Selection

Selects the probe used for alarm temperature monitoring.

Att: Alarm Temperature Type

Defines alarm temperature type as absolute or relative.

HAL: High Alarm

Sets the maximum temperature threshold for high alarms.

LAL: Low Alarm

Sets the minimum temperature threshold for low alarms.

AFd: Alarm (Fan) Differential

Sets the operating differential for temperature alarms.

PAO: Power-on Alarm Override

Excludes alarms for a set period after instrument startup.

dAo: Defrost Alarm Override

Excludes defrost alarms for a set period after defrost.

tAo: Temperature Alarm Override

Sets a delay for temperature alarm signaling.

Fco: Fan Compressor Off

Enables or disables fan lock when the compressor is OFF.

CPP: Compressor Probe Protection

Selects output state in case of faulty probe.

dc: Duty Cycle

Defines ON/OFF times for the relay via Ont/OFt parameters.

Ont: On Time (Compressor)

Sets the ON time for the compressor when in duty cycle mode.

OFt: OFF Time (Compressor)

Sets the OFF time for the compressor when in duty cycle mode.

ctP: Compressor Type Protection

Selects protection type to prevent close compressor startups.

cdP: Compressor Delay Protection

Sets the time delay between successive compressor starts.

odo: Output Delay On

Sets a delay for the activation of outputs at startup.

PrP: Presence Probe

Selects the presence of evaporator probes.

CAL: Calibration

Allows calibration of the measured value from the control probe.

AAS: Second Evaporator Termination Temp

Sets the defrost termination temperature for the second evaporator.

dEA: Device Address

Selects the device address within a remote control network.

FAA: Family Address

Selects the device family address within a remote control network.

ndt: Number of Digits

Determines the display number format (e.g., decimal point, resolution).

Loc: Keyboard Lock

Disables the keyboard to prevent unauthorized operations.

PAS: Password

Allows setting a password to access parameter programming.

rEL: Release Firmware

Read-only parameter showing the product's release code.

tAb: Table of Parameters

Summary of factory-set parameters that cannot be modified.

Mechanical Mount

Electrical Connections

Error Messages

Technical Data