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EWFC 1000, Instrukcje, ELIWELL
[ Pobierz całość w formacie PDF ]EWFC 1000
“quick-chill and hold” cold control
WHAT IT IS
The EWFC 1000 is an electronic de-
vice to control all functions in a
“quick-chill and hold” freezer sys-
tem.
GENERAL DESCRIPTION
The EWFC 1000 is an electronic device to
control all functions in a “quick-chill and
hold” freezer system.
It can also be used for units designed for a
quick pull down of product temperature to
approximately 0 °C, or for blast freezing as
dictated by prevailing legislature and regu-
lations. After the initial quick-chill process,
a product-hold temperature cycle can be
programmed for any length of time, during
which the system operates as a normal re-
frigerator.
Various relay outputs are available to con-
trol the components of the system, i.e.
compressor, fan, defrost cycle and cabinet
light.
The change-over from “quick-chill” mode
to “hold” mode can be achieved either on
temperature, by using a product insert
probe, or strictly on time, if an insert probe
is not used. On the contrary, temperature
control is achieved strictly on room probe.
Even if an insert probe is used, the quick-
chill will terminate on time, in the event that
the probe is not properly inserted into the
product.
A comprehensive parameter programming
menu is available through which all data
can be entered, such as the various oper-
ating temperatures, time delays and oper-
ating modes.
The end of a “quick-chill” cycle and start of
a “hold” cycle are signalled by an on-board
buzzer.
A number of status lights indicate the sta-
tus of the programming and of the func-
tioning of the equipment.
EWFC is available in two versions: vertical
format 72x216 mm and horizontal format
216x72 mm, both for panel mount.
HOW IT IS MADE
• Housing: black ABS plastic, self-
extinguishing
• Dimensions: front 72x215.5 mm
(2.84x8.5”), depth 110 mm (4.33”)
• Mounting: flush panel mount with
two mounting studs provided
• Connections: Faston connectors
6.3 mm (1/4” male spade)
• Display: 12.5 mm LED (0.50")
• Push buttons: located on front
panel
• Relay output: one (1) SPST relay
15(7)A 250V AC for compressor,
one (1) SPDT relay 8(3)A 250V AC
for defrost, two (2) SPST relays
8(3)A 250V AC for evaporator fan
control and light
• Remote alarm output: one (1) out-
put 12 Vdc/50 mA to remote alarm
buzzer or relay
• Analog inputs: two (2) PTC probes
for temperature control and de-
frost termination, one (1) insert
probe for product control
• Digital inputs: four (4) digital in-
puts for door switch, insert probe
in “parking”, compressor alarm
and fan alarm
• Resolution: 1 °C (°F)
• Accuracy: better than 0.5% of full
scale
• Power supply (dep. on model):
12 Vdc or 220, 110, 24 Vac,
50/60 Hz
OPERATION
Operating cycle selection
When the instrument is turned on with the
“On/Off” button, the display will flash
“SEL”, prompting the selection of the re-
quired operating cycle.
The following Leds will be blinking: “Quick-
chill at positive temperature”, “Quick-chill
at negative temperature” and “Hold, above
or below freezing”.
Any of the following modes may be select-
ed by using the respective buttons (see
“front keypad” section):
1) quick-chill at positive temperature
(above freezing);
2) quick-chill at negative temperature (be-
low freezing);
3) hold, above freezing;
4) hold, below freezing;
5) quick-chill and hold above freezing;
6) quick-chill and hold below freezing;
The selection of the above combinations is
done simply by pushing the corresponding
buttons in sequence.
PLUS PRODUCT
• Easy function selection by means
of keyboard guided steps
• Automatic detenction of insert
probe presence
• Product surface anti-freeze func-
tion
• Available in “horizontal” or “verti-
cal” version
Cycle change mode selection (cycles 5
and 6)
The change-over from the quick-chill
mode to the hold mode can be done either
on temperature or on time. If the “Time”
button has not been activated, then the
change-over point will be dictated by the
product core temperature as sensed by
the insert probe in relation to the setpoint
as selected during the programming (see
“parameter programming” section). If how-
ever it is decided not to use the insert
probe, then push the “Time” button; the
change-over will now take place upon
lapse of the time period as programmed
with the corresponding parameter.
In the event that the probe was accidental-
ly not inserted in the product, then the sys-
tem will detect such condition and cause
the cycle change-over to take place strict-
ly on time.
The same will occur in the event that the
probe has been placed in its holder which
will activate the “probe holder” switch.
Cycle start
A cycle is started with the “Start/Stop” but-
ton.
During the quick chill cycle a particular
control algorithm will eliminate “surface
chrystalisation” of the product, a phenom-
enon harmful to hygienic principles.
Defrost management
Before a quick-chill cycle is initiated, the
system will go through a defrost, in order
to start with a clean coil and thus make
use of the full cooling capacity of the unit.
No further defrosts will take place during
this quick-chill cycle.
During the subsequent hold cycle however
the system will defrost at time intervals as
selected during the set-up programming.
Fans control
The fans remain running during the entire
“quick-chill” phase, be it at positive or neg-
ative temperature (above or below freez-
ing). In the “hold” phase however the fans
will operate in parallel with the compressor,
regardless of whether it operates at posi-
tive or negative temperature.
Via the parameter programming it is possi-
ble to select a “fan-off” temperature, along
with a corresponding switching differential.
Status display
Each button has a corresponding Led sta-
tus light. These will flash once to indicate
that this function or mode can be selected;
a steady Led indicates that the corre-
sponding cycle is in progress, while a
flashing Led means that the cycle is wait-
ing to be activated.
In addition, there is a Led for each output.
The 3-digit Led display normally shows the
cabinet temperature; the product core
temperature can be read by pushing the
appropriate button.
If a “cycle change-over on time” was se-
lected, or the insert probe is not activated,
then the display will show the time remain-
ing to the end of the quick-chill cycle.
FRONT KEYPAD
Led means that the fan is in a delay-be-
fore-start mode.
start
stop
Start/Stop
Starts the selected cycle if the machine is
off or stops the cycle when it is running.
Insert probe Led
If this status light is on it means that the in-
sert probe is activated. A flashing light can
either mean that the probe is located in its
“probe holder”, or - if the flashing started
some time after the quick-chill cycle began
- that the probe is not inserted into the
product, thus causing the cycle to termi-
nate on time.
Positive quick-chill (65…10)
Pre-sets the system for a quick-chill cycle
above or close to freezing temperature.
The required temperature setting is select-
ed with a programming parameter.
Negative quick-chill (65...–22)
Pre-sets the system for a quick-chill cycle
below freezing. The required temperature
setting is selected with a programming pa-
rameter.
Defrost Led
This pushbutton is on, when a defrost cy-
cle is in progress.
Programming Led
Flashes during the entire parameter pro-
gramming procedure.
Hold
Pre-sets the system for a hold cycle.
The system will function as a normal refrig-
eration unit, if neither the “65...10” nor the
“65...–22” has been activated. The hold
temperature can be selected within one of
two ranges, i.e. 65...10 or 65...–22 by
pushing the appropriate button (the corre-
sponding Led will light up).
On the other hand, if a quick-chill cycle is
already selected, then activating this but-
ton will only light up the Led associated
with the temperature relative to the prese-
lected quick-chill cycle.
Alarm Led
Status light for tthe 12 Vdc/50 mA remote
alarm signal.
This Led stays steady during an alarm
caused by a probe or high or low temper-
ature.
PARAMETER PROGRAMMING
Programming mode can be entered by
holding an hidden key pressed for some
seconds. Such key is located in the lower
right (under the “Prg” Led) in the vertical
model and in the upper right (beside the
“Prg” led) in the horizontal model.
The display shows the label of the first pa-
rameter, and the “Prg” Led starts blinking.
To skip to the other parameters press
“Light” (which operates as “Up” key) and
On/Off (which operates as DOWN); to see
the value of the selected parameter press
the key “room probe/core temperature
probe” placed above (vertical version) or
on the right (horizontal version) of the
“Light” key.
To change such value press “Light” and
“On/Off” until the required value is dis-
played. By pressing “room probe/core
temperature probe” again the label of the
parameter will be displayed - the new val-
ue has been stored.
The instrument exit from parameters’ pro-
gramming mode and stores data in case
no operation is performed for a few sec-
onds.
Cabinet probe/Insert probe
With this button the temperature display
can be alternated between cabinet tem-
perature and insert probe temperature; the
corresponding Led indicates which is the
case.
Time
Pushing this button de-activates the insert
probe; the change-over between the two
cycles will now be determined by time, as
selected with the appropriate parameter.
The display will switch to show the time re-
maining to the end of the quick-chill cycle.
During this mode the temperature can still
be shown, simply by pushing the “Cabinet
probe/Insert probe” button; the display will
show the temperature for a few seconds,
then switch back to the time read out.
Light
This pushbutton activates the relay con-
nected to the cabinet light. Push again to
turn the light off.
DESCRIPTION OF PARAMETERS
Note: the letter “A“ refers to parameters
which apply to the operating cycles for
positive temperature (cycles 1, 3 and 5),
while the letter “C“ applies to negative tem-
peratures (cycles 2, 4 and 6).
diF
: diFferential.
Switching differential between on and off
the compressor relay.
LAA
: Low Alarm “A”.
Temperature deviation below box setpoint,
beyond which the low temperature alarm is
activated (cycles 1, 3, 5; see the initial
note).
On/Off
Turns the instrument on or off. Power to
the EWFC 1000 is still live, even when the
instrument has been turned off.
Compressor Led
Indicates whether the compressor is run-
ning; a flashing Led means that the com-
pressor is in a delay-before-start mode.
Fan Led
Shows that the fan is running; a flashing
EWFC 1000 7/2000 ing
2
prg
light
on
off
DEFAULT SETTINGS - STANDARD MODELS
even if no evaporator probe is used.
n = no; y = yes.
tcA
: time cycle “A”.
This is the defrost time limit after which the
defrost is terminated; applies to cycles 1, 3
and 5 and is expressed in minutes.
tcC
: time cycle “C”.
This is the defrost time limit after which the
defrost is terminated; applies to cycles 2, 4
and 6 and is expressed in minutes.
diA
: defrost interval “A”.
Defrost frequency, i.e. time interval be-
tween two consecutive defrost starts; ap-
plies to cycles 1, 3, 5 and is expressed in
hours.
diC
: defrost interval “C”.
Defrost frequency, i.e. time interval be-
tween two consecutive defrost starts; ap-
plies to cycles 2, 4, 6 and is expressed in
hours.
dEA
: dEfrost termination “A”.
Defrost termination temperature for cycles
1, 3 and 5.
dEC
: dEfrost termination “C”.
Defrost termination temperature for cycles
2, 4 and 6.
ddt
: defrost drainage time.
Upon defrost completion, evaporator fan
and compressor remain “OFF” for this
amount of time to allow coil drainage; ex-
pressed in seconds.
dct
: defrost count type.
This determines the way the defrost inter-
val time (“diA” and “diC”) is calculated.
The choice is:
dF = digiFrost
®
; time calculation is based
on accumulative running time of the com-
pressor;
rt = real time; time calculation is based on
running time of the system and controller;
SC = Stop Compressor; a defrost cycle is
activated each time the compressor stops.
ddl
: defrost disply lock.
Temperature display can be “locked“ in
during a defrost.
n = no; the actual box temperature is dis-
played during defrost;
y = yes; the temperature shown at the mo-
ment a defrost starts is locked in and re-
mains steady during the defrost;
Lb = Label; the display will show the “dEf“
label during the entire defrost cycle.
Note: in case of “y” or “Lb” the display will
switch back to the actual temperature only
after setpoint has been reached again after
a defrost.
FSA
: Fan Stop “A”.
Temperature setting above which the fan
stops in cycles 1, 3 and 5.
FSC
: Fan Stop “C”.
Temperature setting above which the fan
stops in cycles 2, 4 and 6.
Ftd
: Fan time delay.
Fan start time delay in seconds after com-
pletion of a defrost, or after a defrost
drainage time, if used.
SCA
: Set Cabinet probe “A”.
Required setting of the cabinet (box) tem-
perature during cycle 1 and quick-chill
phase of cycle 5.
Parameter
Description
Range
Default
Unit
diF
diFferential
1…15
2
°C / °F
LAA
Low Alarm “A”
0…60
40
°C / °F
LAC
Low Alarm “C”
0…60
40
°C / °F
hAA
high Alarm “A”
0…60
40
°C / °F
hAC
high Alarm “C”
0…60
40
°C / °F
AFd
Alarm (and) Fan differential
0…60
2
°C / °F
AtA
Alarm time delAy
1…60
60
minutes
EPr
Evaporator Probe read-out
/
/
°C / °F
dty
defrost type selection
EL / in
EL
flag
dPo
defrost (at) Power-on
n / y
n
flag
tcA
time cycle “A”
0…99
5
minutes
tcC
time cycle “C”
0…99
5
minutes
diA
defrost interval “A”
0…24
2
hours
diC
defrost interval “C”
0…24
2
hours
dEA
dEfrost termination “A”
–60…60
2
°C / °F
dEC
dEfrost termination “C”
–60…60
2
°C / °F
ddt
defrost drainage time
0…240
60
seconds
dct
defrost count type
rt / dF
rt
flag
ddl
defrost display lock
n / y / Lb
Lb
flag
FSA
Fan Stop “A”
–20…99
10
°C / °F
FSC
Fan Stop “C”
–20…99
10
°C / °F
Ftd
Fan time delay
0…240
30
seconds
SCA
Set Cabinet probe “A”
–60…50
5
°C / °F
SSA
Set inSert probe “A”
–50…50
10
°C / °F
i1A
interval 1 “A”
24 / 240
120
minutes
SE1
SEt 1
–60…60
2
°C / °F
SCC
Set Cabinet probe “C”
–60…50
–25
°C / °F
SSC
Set inSert probe “C”
–50…50
–22
°C / °F
i1C
interval 1 “C”
24 / 240
120
minutes
SE2
SEt 2
–60…60
–22
°C / °F
dod
disable with opened door
n / y
y
flag
oAo
output (door) Alarm override
1…60
30
seconds
dSd
diSable (light) with open. door
n / y
y
flag
tLC
time light Cabinet
0…60
30
seconds
cdP
compressor delay Protection
1…99
1
minutes
CAL
CALibration
–20…20
0
°C / °F
tAb
tAble of parameters
/
/
/
LAC
: Low Alarm “C”.
Temperature deviation below box setpoint,
beyond which the low temperature alarm is
activated (cycles 2, 4, 6; see the initial
note).
hAA
: high Alarm “A”.
Temperature deviation above box setpoint,
beyond which the high temperature alarm
is activated (cycles 1, 3, 5; see the initial
note).
hAC
: high Alarm “C”.
Temperature deviation above box setpoint,
beyond which the high temperature alarm
is activated (cycles 2, 4, 6; see the initial
note).
AFd
: Alarm (and) Fan differential.
Switching differential of the fans, in addi-
tion to the high and low box temperature
alarms.
AtA
: Alarm time delAy.
Time delay for temperature alarm initiation,
in minutes.
EPr
: Evaporator Probe read-out.
This parameter provides a read-out of the
actual temperature of the evaporator
(sensed by the defrost termination probe)
even during normal operation.
dty
: defrost type selection.
To select the defrost type.
EL = ELectric defrost;
in = hot gas (reverse cycle) defrost.
dPo
: defrost (at) Power-on.
Selects whether the system should go
through a defrost cycle at start-up (or after
a power failure).
If set at “y“ (yes), defrost will take place,
3
EWFC 1000 7/2000 ing
CONNECTIONS
EWFC 1000
1 2
3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18
19 20 21 22 23 24 25 26 27 28 29 30
+
–
room
probe
defrost
probe
door
switch
alarm
insert
probe
comp.
alarm
switch
probe
holder
switch
fans
alarm
switch
comp.
fans
defrost
light
POWER SUPPLY
SSA
: Set inSert probe “A”.
Required setting of the termination tem-
perature of cycle 1 and of quick-chill phase
of cycle 5 (if a product insert probe is
used).
i1A
: interval 1 “A”.
Time setting, in minutes, which determines
the maximum duration of cycle 1 and of
quick-chill phase of cycle 5, if operated on
time only (without insert probe).
SE1
: SEt 1.
Setting of the cabinet (box) temperature re-
quired during cycle 3 and of hold phase of
cycle 5.
SCC
: Set Cabinet probe “C”.
Required setting of the cabinet (box) tem-
perature during cycle 2 and quick-chill
phase of cycle 6.
SSC
: Set inSert probe “C”.
Required setting of the termination tem-
perature of cycle 2 and of quick-chill phase
of cycle 6 (if a product insert probe is
used).
i1C
: interval 1 “C”.
Time setting, in minutes, which determines
the maximum duration of cycle 2 and of
quick-chill phase of cycle 6, if operated on
time only (without insert probe).
Note: the effective value will be 120 min-
utes higher than selected.
SE2
: SEt 2.
Setting of the cabinet (box) temperature re-
quired during cycle 4 and of hold phase of
cycle 6.
dod
: disable with opened door (compres-
sor and fan).
A choice is given whether or not to stop
the compressor and fan when door is
opened.
n = no; y = yes.
oAo
: door Alarm override.
Alarm time delay in seconds after the door
is opened.
dSd
: diSable light with open door.
Light comes on automatically when door is
opened.
n = no; y = yes.
tlC
: time light Cabinet.
Time in seconds after which the light is
turned off; if set at “0” the light is controlled
directly by door closure or by the light but-
ton.
cdP
: compressor delay Protection.
Compressor start time delay in minutes to
avoid short-cycling.
CAL
: CALibration.
This is an offset calibration which may be
required due to the location of the sensor.
tAb
: tAble of parameters.
This is factory set and can not be modified;
it is determined by the parameter configu-
ration.
The fans alarm input, if interrupted, cuts off
the compressor output; this input should
be shorted if not used.
INSTALLATION
The EWFC 1000 is designed for flush pan-
el mounting. Insert the unit through a
65.5x209.5 mm and affix with the brackets
supplied.
The ambient temperature around the in-
strument should be kept between –5 and
65 °C (23…149 °F).
Select a location which will not be subject
to high humidity or condensation.
ELECTRICAL WIRING
The EWFC 1000 is equipped with Faston
spade connectors 6.3 mm.
Make sure that the available voltage corre-
sponds to the nameplate rating of the in-
strument.
Power remains connected even if the in-
strument is turned off; a main switch
should therefore be installed between the
instrument and the mains.
The three PTC-type sensors do not require
polarity and can be extended in the field by
using common 2-lead wire. It is strongly
recommended that the probe wiring is
kept away from power leads.
Also, it is good practice to install the sen-
sor tip facing up, in order to avoid moist
from entering the sensor housing. the dig-
ital inputs should be dry contacts, voltage
free.
The compressor output relay is voltage
free and can handle up to 1.5 HP; use a
suitable external contactor for larger com-
pressors.
DIGITAL INPUTS
The EWFC 1000 can accommodate up to
four input signals, dry contact and voltage
free.
The door switch input controls the cabinet
light: light on when input open, off when
contact is closed.
If the light has already been switched on
with the (manual) button, then this input
has no further effect (see “FRONT KEY-
PAD” section).
Opening of the door switch input causes
the Led warning light located above the
“LIGHT” button to come on, and causes
an audible alarm (internal buzzer) to go off
after the delay time selected through para-
meter “oAo”. The acoustic alarm can be
turned off simply by pushing any front pan-
el button; the visual alarm remains on until
the door is closed (input contact closure).
The insert probe parking input enables, if
shorted, the time (parameters “i1A” and
“i1C”) to control the the maximum duration
of cycle 1 and 2 and the change-over from
“quick-chill” mode to “hold” mode during
cycles 5 and 6.
The compressor alarm input, if interrupted,
cuts off the compressor output; this input
should be shorted if not used.
ERROR ANNUNCIATION
The EWFC 1000 will display a number of
temperature or probe error alarm condi-
tions.
In the event of an open or shorted box
probe the alarm Led status light will come
EWFC 1000 7/2000 ing
4
on, while the display will alternate between
code “CP” (Cabinet Probe) and the actual
box temperature. Likewise, a code “EP”
(Evaporator Probe) will appear to signal an
evaporator probe alarm, “IP” (Insert Probe)
to signal an insert probe problem.
If the box probe is open or shorted the cy-
cle in progress is immediately interrupted,
while a defrost cycle will continue and ter-
minate normally. At this point the START
function of the unit is blocked until such a
time that - upon correction of the error -
the system is turned OFF first (manual re-
set).
In the event that the evaporator probe be-
comes defective (open or short circuit), the
cycle in progress will continue and termi-
nate normally, while a defrost cycle is
stopped at once.
The “START” function is again blocked,
however the reset is automatic. Finally, in
the event of an insert probe defect, the cy-
cle in progress will terminate on time only,
a defrost terminates normally and the reset
is automatic.
If the temperature goes below the low
alarm temperature setting, or above the
high alarm temperature setting; then the
error codes “LI” (Low lImit), respectively
“HI” (High lImit) will be displayed; this alarm
not have any effect on the operation of the
machine.
Relay outputs
: one (1) SPST relay 15(7)A
250V AC for compressor, one (1) SPDT re-
lay 8(3)A 250V AC for defrost, two (2)
SPST relays 8(3)A 250V AC for evaporator
fan control and light.
Remote alarm output
: one (1) output
12 Vdc/50 mA to remote alarm buzzer or
relay.
Analog inputs
: two (2) PTC probes for
temperature control and defrost termina-
tion, one (1) insert probe for product con-
trol.
Digital inputs
: four (4) digital inputs for
door switch, insert probe in “parking”,
compressor alarm and fan alarm.
Resolution
: 1 °C (°F).
Accuracy
: better than 0.5% of full scale.
Power supply
(depending on model):
12 Vcc ±15%; 12, 24, 110, 220 Vca
±10%, 50/60 Hz.
DISCLAIMER
This manual and its contents remain the
sole property of Invensys Climate Controls
s.p.a., and shall not be reproduced or dis-
tributed without authorization. Although
great care has been exercised in the
preparation of this document, Invensys
Climate Controls s.p.a., its employees or
its vendors, cannot accept any liability
whatsoever connected with its use.
Invensys Climate Controls s.p.a. reserves
the right to make any changes or improve-
ments without prior notice.
TECHNICAL DATA
Housing
: black ABS plastic, self-extin-
guishing.
Dimensions
: front 72x215.5 mm
(2.84x8.5”), depth 110 mm (4.33”).
Mounting
: flush panel mount with two
mounting studs provided.
Connections
: Faston connectors 6.3 mm
(1/4" male spade).
Display
: 12.5 mm LED (0.50").
Push buttons
: located on front panel.
Data storage
: non-volatile EEPROM
memory.
Operating temperature
: –5…65 °C
(23…149 °F).
Storage temperature
: –30…75 °C
(–22…167 °F).
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 eliwell@invensysclimate.com
Internet http:/www.climate-eu.invensys.com
7/2000 ing
cod. 9FT41047
5
EWFC 1000 7/2000 ing
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