TECHNICAL SPECIFICATION
ELECTRONIC CONTROL UNIT
for gas or electric deep fryer
EC 8-256
* Dimensions: 42 x 90 mm (user interface) and 105 x
90,5 mm (power module).
* Power supply: 230 Vac (standard).
* Buzzer for signals and alarm intervention.
* Access to parameter configuration controlled by
password.
* Personalised configuration programmable by key-
board or Personal Computer.
The EC 8-256 electronic control unit has been specifically designed for the control of gas or electric deep fryer. It is composed
of a power and a keyboard, which are connected by a 16-pole cable.
The unit input can be used with "J" (Iron-Constantan) or "K" (Chrome-Alumel) type thermocouples depending on factory settings.
The oil average temperature control is divided in three phases:
"pre-heat" (melting), when the unit output is energised with cyclic control until a temperature threshold is reached (this threshold can
be set by parameter configuration); this operation with reduced power at start-up avoids fast temperature increases and facilitates the
melting of fat used for frying
"conservation", when constant oil temperature is maintained; in this phase it is possible to maintain the temperature of melted oil before
frying, and to avoid the fat becoming dense again
"main control", when a P.I.D. temperature control (Proportional, Integral and Derivative) is active until the required temperature is
reached; in the last two phases an LED indication is available when the oil temperature approaches the required value, and the buzzer
gives a specific signal when such value has been reached.
The unit can be used for the control of both electric and gas deep fryer. The set of parameters that is specific for each type of deep fryer
can be easily set by a dipswitch located at the back of the keyboard.
An analogue memory, which is standard supply for this device, allows maintaining the temperature control in the event of short power
supply failures. In this case the unit will start again and revert to the same operating condition that it had before the failure.
The output is a NO relay that can drive a maximum of 6 A @ 250 Vac. All connections are made by robust 6,3 mm faston type connectors
(for the probe, the power supply and the output).
A buzzer and a flashing indicator have been included to warn to the user in the event of irregular operating conditions: probe failure,
data memory failure and temperature measurement outside the probe operating range.
The unit is also provided with a temperature alarm that can be disabled, and that can be configured is six operating modes: in the event
of alarm intervention the buzzer gives an intermittent signal while the display shows the warning label "AL1" alternated with the temperature
measurement.
* 3 configurable operating modes.
* P.I.D. temperature control during "main control"
phase.
* 3 digit display, height 12,5 mm.
* 1 output relay, 6 A @ 250 Vac.
* 1 temperature alarm completely configurable.
1 '96
1
OPERATION
c
Analogue memory; available parameter:b0
An analogue memory is provided for the unit to maintain temperature control in the event of short power supplly failure; in this case
the unit will start and revert to the same operating condition that it had before the failure.
During "START" mode, when the unit switches off and again because of power supply failure, if the time between off and on is less
than the protection time than the unit will switch on and revert to the operating conditions and settings that had been stored in memory
before it had switched off.
Vice-versa, if the time between off and on is longer than the protection time, at switch on the unit automatically changes to "STOP"
mode (output non active), the buzzer gives an intermittent signal while the display shows the label "PF" alternated with the temperature
measurement.
It is possible to exit this alarm condition by pressing the START/STOP key for more than one second; the unit will then revert to the
same operating condition thai it had before the failure.
T1 key = SET/UP
START/STOP key
Fig. 1 - User interface
T2 key= DOW N/MUTE
MELT ledSTART/STOP led
MELT key
Pre-heat (melting); available parameters: b1, b2, b5, b6, b7
The "pre-heat" function is included to avoid fast temperature increases in the deep fryer oil sump at unit start up and to facilitate the
melting of the fat used for frying.
During this phase the output is energised with cyclic control until the temperature threshold Melt is reached (parameter b2); parameters
b5 and b6 can be used to set the duration of this part-load cycle and the percentage of cycle time when the output must be energised.
output
relay
b5 b5b5
ON
b6 = 40%
OFF
"pre-h eat" fun ction
tiva tion
a
Fig. 2 - Output relay operation during "pre-heat" function
During "STOP" status, the "pre-heat" function can be activated by pressing the START/STOP key for more than one second if the probe
temperature measurement is lower than threshold Melt (parameter b2) and:
If these two conditions are not satisfied, pressing the START/STOP key for more that one second during "STOP" status will immediately
activate the P.I.D. temperature control unit the required temperature has been reached. Then, when the MELT key is pressed for more
than one second, the P.I.D. control is terminated, the "preriscaldo" function starts and the unit is set to switch automatically to
"conservation" phase after "pre-heat".
During "pre-heat" function, the START/STOP LED flashes to indicate that tempeature control is active; the MELT LED flasches only
when the unit is set to switch automatically to "conservation" phase at the and of the function.
- paramerter b1 is set to 1
- funtion "conservation" has been selected during "STOP" status by pressing the MELT key for more than one second;
in this way the unit is also set to switch automatically to "conservation" after the "pre-heat" phase has been completed
(this situation is indicated by MELT LED being switched on during "STOP" status).
2
tim e
1 '96
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