OSAKA OPERATING INSTRUCTIONS –COC 30- Page
5
4.2 – TEMPERATURE AND POWER REGULATOR
The temperature regulator is of the ON/OFF kind and activates
the power regulator according to the Set Point and the relative
differential.
With the COC 30, it is possible to have split temperature
control for the TOP and FLOOR, or alternatively a single
control for the entire oven.
If you wish split control, the TOP and FLOOR probes must be
connected and the enable floor probe “EFP” = ON parameter
set, whereas for single probe temperature control, only the
TOP probe needs to be connected and the “EFP” = OFF
parameter set. All regulation parameters are contained in the
“
]
rG” group.
SINGLE PROBE CONTROL
The regulator with one probe operates in heating mode on both
the HEAT TOP and HEAT FLOOR outputs, according to the
SET1
“SP1
”, of the differential
“HS
1” and the
“OP1, OP2”,
“tCP”
parameters that will be described below.
The regulator’s unusual feature consists in the fact that it can
control the power on the two outputs following a time cycle that
can be set to the
“tC
P” parameter.
The control powers for the top and floor are displayed on two
bars and can be set under the
“OP1”
and
“OP2”
parameters
(or as described in paragraph 2.3) with a range from 0 to 100
% and 10% definition.
The instrument also has a
“PSP”
parameter that can be used
to manage the setting of the two powers as:
=0 – independent
=1 - dependent so that an increase in one causes an automatic
decrease in the other, so that if the top and floor powers are
equal, the sum of the powers is always 50% of the whole.
=2 – dependent so that a decrease in one power causes the
automatic switch to 100% of the other, so that, if the top and
floor powers are the same, the sum of the powers is always
between 50 and 100% of the total.
Therefore, if the temperature regulator foresees the enabling of
the outputs, the power limiter will be off and the power set for
the outputs is 100%, both the HEAT TOP and HEAT FLOOR
outputs will always be lit.
If, on the other hand, in the same conditions, powers different
from 100% are set starting from the cycle time count:
The TOP output remains on for the time : [tCP x OP1/100] and
off for the time : [tCP - (tCP x OP1/100)]
The FLOOR output remains off for the time : [tCP - (tCP x
OP2/100)] and on for the time: [tCP x OP2/100]
For example, with the parameters set in this way:
“tCP” = 10 sec. “OP1” = 90 % “OP2” = 50 % t
he following function is obtained:
HEAT TOP on = 10 x 90/100 = 9 sec.
HEAT TOP off = 10 - (10 x 90/100) = 1 sec.
HEAT FLOOR on = 10 x 50/100 = 5 sec.
HEAT FLOOR off = 10 - (10 x 50/100) = 5 sec.
Should the power limiter be activated, by pressing the PW. LIM
key, the relative led will light and the controller will ensure that
the outputs are never simultaneously on (therefore if the two
resistances are equal, the maximum power absorbed is 50%).
This occurs in any case when, without the limiter being on, the
sum of the two powers is less than 100%.
Therefore, the function with the power limiter on, starting from
the count of the cycle time is as follows:
1) the TOP output remains on for the time: [tCP/2 x OP1/100]
2) Both outputs remain off for the time: [(tCP/2 - (tCP /2 x
OP1/100)) +(tCP/2 - (tCP/2 x OP2/100))]
3) the FLOOR output switches on for the time: [tCP/2 x
OP2/100] and so on.
For example, with the parameters thus set: “tCP” = 10 sec.
“OP1” = 90 % “OP2” = 50 %
HEAT TOP on = 10/2 x 90/100 = 4.5 sec.
HEAT TOP and FLOOR off
= 10/2 - (10/2 x 90/100) + 10/2 - (10/2 x 50/100) = 3 sec.
HEAT FLOOR on = 10/2 x 50/100 = 2.5 sec.
It goes without say that when the Set temperature is reached
both outputs switch off.
2 PROBE CONTROL
With two probes the regulator operates in heat mode on both
the HEAT TOP and HEAT FLOOR outputs, according to SET1
“SP1”
and SET2
“SP2”,
differentials
“HS
1” and
“HS2”,
and
the
“OP1, OP2”, “tCP”
parameters.
As for single probe control, it is possible to control the power
on the two (top and floor) resistance control outputs according
to the cycle time
“tC
P”.
Operation is identical to single-probe control, with the
difference that the power regulator, and consequentially the
two outputs are deactivated by both Sets rather than just one.
Therefore, if both the TOP and FLOOR temperature regulators
foresee the activation of the outputs, the power limiter is off
and the power set for the outputs is 100%, both outputs are
always on.
If, in the same conditions, powers differing from 100% are set
starting from the cycle time count, the outputs are activated as
seen previously for single-probe control.
Should the power limiter be activated, the controller ensures
that the outputs are never switched on simultaneously, as seen
previously.
On reaching the temperature of both regulators, obviously both
outputs are switched off.
On the other hand, should one of the two regulators need its
output to be switched off, the power limiter is temporarily
switched off and therefore access to the other regulator can
always remain switched on (obviously if the power set for it is
100%).
Limiter function is automatically restored when both regulator
outputs must be switched on.
4.3 – TEMPERATURE ALARMS
The instrument is fitted with an over-temperature alarm
function that indicates oven temperature abnormalities, by
means of an internal buzzer, a luminous signal (ALARM led)
and, optionally, an output (AUX if present and suitably
programmed).
All temperature alarm parameters are contained in the
“
]
AL”
group. Temperature alarms can be set as absolutes or relative
to the regulation set.
The alarm function parameters are:
“A1
t” – Probe 1 (TOP) alarm function mode as absolute or
relative
“A1L” -
Set probe 1 (TOP) minimum alarm
“A1H” –
Set probe 1 (TOP) maximum alarm
“HA1” -
Probe 1 (TOP) alarms differential