milk controller

MILK CONTROLLER
technical data sheet
electronic controller for refrigerating units milk preservation
oriented
EWPX MILK CONTROLLER
controller for refrigerating units milk preservation oriented
GENERAL DESCRIPTION
The instrument provides an input probe
for temperature control, and three
output relays for the compressor, the
agitation system and the management of
the alarms.
As a standard feature it can be connected
to the Televis system (by means of the
specific interface module). The
instrument can be configured according
to its application by means of a series of
parameters.
The instrument comes in the standard
ELIWELL 32x74 mm format.
COMMANDS ON FRONT
PANEL
The instrument is provided with two keys:
“UP” and “SET/DOWN”.
SET/DOWN: by pressing this key the
Setpoint is displayed.
The same key can be used to decrease
the values during Setpoint change or
parameters programming.
UP: button used to increase values. Used
to change both the Setpoint and the
parameters.
This key also permits manual activation
of the agitation cycle.
“COMPRESSOR” LED: LED linked to the
compressor relay. Lit up when the
compressor is working.
“SET” LED: permanently lit up during
Setpoint display and programming,
flashes during parameter programming.
“AGITATION” LED: LED associated with
the agitator. Lit up when the cycle is
underway, flashes in the event of manual
activation of said cycle.
“ALARM” LED: LED associated with the
alarm. It is on when the alarm is active,
and flashes when the alarm has been
silenced.
DISPLAYING AND SETTING OF THE
SETPOINT
In order to display the Setpoint value,
press and release the “SET/DOWN” key;
the Setpoint value will appear on the
display and the "SET" LED will light up.
To change the Setpoint value operate on
the “UP” and “SET/DOWN” keys within 10
seconds. If no action is taken on the
keypad within this time, normal mode
will be restored.
MANUAL ACTIVATION OF THE
AGITATION CYCLE
Manual activation of the agitation cycle is
obtained by keeping the “UP” key
pressed down for over 7 seconds (this
key is not active during Setpoint or
parameter programming). Activation of
the agitation cycle may also be started on
closure of the specific digital input.
SILENCING THE ALARM
An alarm status is signalled by the
lighting up of the “ALARM” LED and
activation of the related relay.
The alarm can be silenced by pressing
one of the two keys on the front panel;
the relay will be disabled, while the LED
will flash as long as the alarm status
continues.
KEYPAD LOCKING
Appropriate programming of the "Loc"
parameter allows the user to disable the
keypad so as to avoid undesired use of
the functions or parameters of the
instrument.
When the keypad is disabled, the
Setpoint and the parameters can only be
displayed (and not changed); the only
exception is the “Loc” parameter itself,
which can be used to unlock the keypad.
PASSWORD TO ACCESS PARAMETER
PROGRAMMING
A password can be set to allow access to
the parameter programming phase.
In order to set (or change) the password
simply access the “PAS” parameter and
key in a number from 1 to 15 (by setting
the value 0 the password is disabled). The
password will be enabled on exiting the
parameter programming phase.
EWPX MILK CONTROLLER Rel. 01.00 03- 2000 / Eng
release 01.00
03-2000/ Eng
cod. 9IS21005
If a password has been enabled, on
request to access the parameters
programming phase, the label “PAS” will
appear. Press down simultaneously and
immediately release the “UP” and
“DOWN” keys; at this point, set the
correct value of the password using the
“UP” and “DOWN” keys. If the password
is correct, pressing together and
immediately releasing the “UP” and
“DOWN” keys will enable the user to
access the parameter programming
phase.
PARAMETERS
PROGRAMMING
The programming phase can be accessed
by pressing the “UP” and "SET/DOWN"
keys for more than 7 seconds.
The first parameter is displayed and the
“SET” LED will flash. In order to access
the other parameters press the “UP” or
“SET/DOWN” key. In order to view the
values of the parameters shown on the
label press the “UP” and "SET/DOWN"
keys simultaneously. To change the value
press the “UP” or “SET/DOWN” key.
The storage of new values takes place
automatically on exiting the
programming mode, which comes about
by not operating on the keys for several
seconds.
DESCRIPTION OF THE PARAMETERS
diF: diFferential.
Setpoint intervention differential.
For applications in the field of
refrigeration the differential must be set
at positive values: the compressor will
stop when the Setpoint value set is
reached (on the indication of the control
probe) and start again when the
temperature reaches the Setpoint plus
the differential value.
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Table of parameters
Parameter
diF
LSE
HSE
dty
dit
dct
dEt
dPo
Att
HAL
LAL
AFd
PAO
dAo
tAo
cPP
Ont
OFt
ctP
cdP
odo
CAL
dEA
FAA
AOP
ndt
Loc
PAS
rEL
Hdc
tAb
Description
diFferential
Lower set
Higher set
Agitator type
agitator int. time
agitator count
type
agitator End.
time
agitator power
on
Alarm
temperature type
High Alarm
Low Alarm
Alarm/fan diff.
Power-on Alarm
Ov.
agitator alarm ov.
temperature
alarm ov.
comp. Probe
Protec.
On time
(compressor)
OFF time
(compressor)
comp. type
Protec.
comp. delay
Protec.
out delay (at) on
CALibration
dEvice Address
FAmily Address
Alarm Output
Polarity
number display
type
(keyboard) Lock
PASsword
RELease firmware
Hardware code
tAble of
parameters
Range
-12…12
-999…HSE
LSE…999
EL/in
0…31
dF/rt/SC/Fr
Default
2
-50
40
EL
3
Fr
Unit
°C / °F
°C / °F
°C / °F
flag
minutes
flag
1…250
30
seconds
n/y
n
flag
Ab/re
Ab
flag
-999…999
-999.1…999
1…50
0…10
50
-50
2
2
°C / °F
°C / °F
°C / °F
hours
0…999
0…250
0
0
minutes
minutes
oF/on/dc
on
flag
0..250
10
minutes
0..250
10
minutes
nP/don/doF/dbi
doF
flag
0…15
0
minutes
0…99
-20…20
0…14
0…14
di/in
0
0
0
0
in
minutes
°C / °F
number
number
flag
Int/dEc/hFn
dEc
flag
n/y
0..15
/
/
/
n
0
/
/
/
flag
number
/
/
/
LSE: Lower SEt.
Minimum value that can be assigned to
the Setpoint.
Usually set to the minimum value
measurable by the probe.
HSE: Higher SEt.
Maximum value that can be assigned to
the Setpoint.
dty: agitator type.
Agitation cycle mode
EL = compressor switched off during
agitation.
in = compressor switched on during
agitation.
dit: agitator interval type.
Interval between agitation cycles;
expressed in hours or in minutes.
dct: agitator counting type.
Counting mode for agitation interval.
dF = only the running time of the
compressor is counted;
rt = real time (the running time of the
instrument is counted);
EWPX MILK CONTROLLER Rel. 01.00 03- 2000 / Eng
SC = Stop Compressor (the agitation
cycle takes place every time the
compressor stops);
Fr = Free (the compressor relay is
released from the functions of the
agitator, and continues to regulate on the
Setpoint independently from the value of
the “dty” parameter).
dEt: agitator Endurance time.
Duration of the agitation cycle; expressed
in minutes or seconds.
dPo: agitator (at) Power-on.
Agitation cycle on start-up.
y = yes;
n = no.
Att: Alarm temperature type.
Interpretation mode for the “HAL” and
“LAL” parameters.
Ab = absolutes;
re = relative to the Setpoint.
HAL: Higher ALarm.
Maximum temperature alarm
LAL: Lower ALarm.
Minimum temperature alarm
The value of this parameter MUST have a
negative value if the parameter “Att” is
set to “re”.
AFd: Alarm differential.
Operating differential of temperature
alarms.
PAO: Power-on Alarm Override.
Alarm exclusion after instrument start-up;
expressed in hours.
dAo: agitator Alarm override.
Alarm exclusion after an agitation cycle;
expressed in minutes.
tAo: temperature Alarm override.
Temperature alarm signalling delay;
expressed in minutes.
cPP: compressor Probe Protection.
Allows the selection of the output status
in the event of a faulty probe.
oF = relay OFF in event of faulty probe.
on = relay ON in event of faulty probe.
dc = duty cycle; the ON and OFF times
for the relay are established by the “Ont”
and “OFt” parameters.
Ont: On time (compressor).
ON time of the compressor (when CPP =
dc); expressed in minutes.
OFt: OFF time (compressor).
OFF time of the compressor (when CPP =
dc); expressed in minutes.
ctP: compressor type Protection.
Allows the user to select the type of
protection against close together start
ups of the output (the time is set using
the subsequent parameter).
nP = no Protection.
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don = delay on start. Delay in activating
the relay.
doF = delay on switching oFf. Minimum
time for relay deactivation.
dbi = delay between two successive
starts. Minimum time between two
successive starts on the relay.
cdP: compressor delay Protection.
Time referring to the previous parameter;
expressed in minutes.
odo: output delay (at) on.
Activation delay of the outputs on startup of the instrument; expressed in
minutes.
CAL: CALibration.
Enables calibration of the displayed value.
dEA: dEvice Address.
Allows the selection of the device
address within the context of the screenbased control network.
FAA: FAmily Address.
Allows the selection of the device family
within the context of the screen-based
control network
AOP: Alarm Output Polarity.
Polarity of the alarm output
di = direct,
in = inverted.
ndt: number of digits.
Type of display
int = reading without decimal point;
dEc = reading with decimal point,
definition of 0.1 °C;
hFn = reserved; not utilised.
Loc: keyboard Lock.
Keypad lock
Allows disabling of the keypad functions
so as to avoid undesired use of the
instrument.
y = yes;
n = no.
PAS: PASsword.
Allows the user to select the password
value (see section on “Password to access
parameter programming ”).
0 = no password is requested to access
parameter programming.
1…15 = possible value for the password.
rEL: rELease firmware.
Read-only parameter which indicates the
device version code.
Hdc: Hardware code.
Read-only parameter which indicates the
hardware code of the device.
tAb: tAble of parameters.
Index of factory set parameter
configurations; cannot be modified by
the user.
MECHANICAL
MOUNTING
The instrument is designed to be panel
mounted. Drill a 29x71 mm hole and
insert the instrument, securing it with the
special bracket provided.
The room temperature range for correct
functioning is between –5 and 60 °C.
Furthermore, avoid mounting the
instruments in locations subject to high
levels of humidity and/or dirt: said
instruments are in fact suitable for use in
environments with an ordinary or normal
level of pollution.
Make sure that the area near to the
cooling slits is left aerated.
ELECTRICAL
CONNECTIONS
Never work on electrical connections
when the machine is switched on.
The instrument is equipped with a
terminal board for the connection of
electric cables with a maximum 2.5 mm2
section (only one conductor per terminal
for power connections).
Ensure that the voltage of the power
supply conforms to that required by the
EWPX MILK CONTROLLER Rel. 01.00 03- 2000 / Eng
instrument: 12 V~/c ±15% (extremely low
safety voltage).
The outputs on the relays, linked by two
terminals, are voltage-free. Do not
exceed the maximum electrical current
permitted (compressor and alarm: 8(3)A
250V~; agitator: 5(2)A 250V~). In the
event of greater loads use a contact with
a suitable capacity.
The maximum current allowed for each
terminal is 17 A; this current must not be
exceeded on the terminals of the
common outputs (terminals 6 and 7).
The NTC-type probe does not require a
connection polarity and may be extended
using a normal bipolar cable (remember
that extending the probe adversely
affects the conduct of the instrument in
terms of electromagnetic compatibility;
take great care when wiring).
The output for the EWRS 485 interface
module of the Televis system must be
connected according to the indicated
polarity.
The probe cables, the connection cable
for the EWRS 485 interface module and
the power supply cable must be kept at a
distance from the cables connected to
the relays. In particular, the co-ordinated
European safety regulations lay down
that the relay contact conductors (and,
generally speaking, all parts subject to
dangerous voltage) should be kept away
from extremely low safety voltage
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connections (probe, Televis serial, power
supply) using insulation systems and
distances which guarantee at least a
double or reinforced insulation.
Electromagnetic compatibility
requirements suggest/impose greater
attention with regard to such separation
by means of using separate insulation
runs and suitable cable fixing methods.
ERROR MESSAGES
In the event of a shorted, interrupted or
disconnected probe, the instrument
anticipates the display of an “E1” error
code.
The same message will appear in the
event of “under range” namely the
exceeding of the minimum display limit
(–55 °C) or “over range”, namely the
exceeding of the maximum display limit
(125 °C).
Before replacing the probe, always check
its connections beforehand.
PERMITTED USE
For safety reasons the control device
must be installed and used according to
the instructions provided and in
particular, under normal conditions, parts
bearing dangerous voltage levels must
not be accessible.
The device must be adequately protected
from water and dust as per the
application and must also only be
accessible via the use of tools (with the
exception of the frontlet).
The device is ideally suited for use on
household appliances and/or similar
refrigeration equipment and has been
tested with regard to the aspects
concerning European reference standards
on safety. It is classified as follows:
- according to its manufacture as an
automatic electronic control device to be
incorporated by independent mounting;
according to its automatic operating
features as a 1 B-type operated control
device;
- as a Class A device in relation to the
category and structure of the software.
USE NOT PERMITTED
Any other use other than that permitted
is de facto prohibited.
It should be noted that the relay contacts
provided are of a practical type and
therefore subject to failure. Any
protection devices required by product
standards or dictated by common sense
due to obvious safety reasons should be
applied externally.
LIABILITY AND
RESIDUAL RISKS
Eliwell shall not be liable for any damages
deriving from:
- installation/use other than that
prescribed and, in particular, that which
does not comply with safety standards
anticipated by regulations and/or those
given herein;
- use on apparatus which does not
guarantee adequate protection against
electric shock, water or dust under the
conditions of assembly applied;
- use on apparatus which allows access to
dangerous parts without the use of tools
and/or without warnings;
- tampering with and/or alteration of the
products;
- installation/use on apparatus not
complying with the standards and
provisions of current legislation.
Analog inputs: a NTC probe for
temperature control.
Digital input: for the remote control of
the agitation cycle.
Temperature range: from –50 to 100 °C
(from –58 to 212 °F).
Definition: 1 °C or 0.1 °C depending on
the programming.
Accuracy: the best of 0.5% at end of
scale.
Power consumption: 3 VA.
Power supply: 12 V~/c ±15%.
TECHNICAL DATA
Housing: plastic in PC+ABS resin with V0
extinguisher rating.
Dimensions: front panel 76x34 mm,
depth 58 mm.
Mounting: panel mounted, on holes of
71x29 mm.
Protection: IP65 front.
Connections: on screw terminal board for
conductors 2.5 mm2 (only one
conductor per terminal for power
connections).
Serial connections: TTL port for the
connection to the interface for the
purposes of linking up to the Televis
system.
Display: on a 3 digit + “ - ” sign display;
digit height 12.5 mm.
Commands: two keys on the front panel,
a terminal board digital input.
Data storage: on a non-volatile memory
(EEPROM).
Room temperature: –5…60 °C.
Storage temperature: –30…75 °C.
Main outputs: 1 output on the N.A. relay
8(4)A 250V~ for the compressor and 1
output on the N.A. relay 5(2)A 250V~ for
the agitation device.
Alarm outputs: 1 output on the N.C. relay
8(3)A 250V~.
EWPX MILK CONTROLLER Rel. 01.00 03- 2000 / Eng
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Invensys Climate Controls s.p.a.
via dell'Industria, 15
Zona Industriale Paludi
32010 Pieve d'Alpago (BL)
ITALY
Telephone +39 0437 986111
Facsimile +39 0437 986066
Email [email protected]
Internet http:/www.eliwell.com
An Invensys company