
EVCO S.p.A. Vcolor 379 | Installer manual ver. 1.0 | Code 144VC379E104
Page 19 o 42
I the oven is on because a programmed switch-on has
started up, the programming icon will be displayed.
7MANAGING LOADS
7.1 Initial infor ation
This paragraph describes the loads during normal operation.
To learn the main consequences o an alarm signal, see the
section “ALARM MANAGEMENT”.
7.2 Te perature regulation
Temperature is regulated by activating the related relays (i
con igured). When the relay activation is cyclical, switch-ons will
be separated in time as much as possible to minimise the top
and loor relays overlapping when they switch-on. The minimum
relay switch-on is also controlled by parameter r10 (minimum
on/o duration o the output or temperature regulation) which
cannot be set below 10 seconds when the regulation relays are
electro-mechanical.
7.2.1 Devices with one analogue input (cha ber
probe)
The oven temperature in this type o device is regulated by the
chamber probe and there are two relay outputs or the top and
loor.
Regulation is always ON-OFF: the outputs are switched on,
according to the power set or each one, either together or in
sequence, until the temperature detected by the chamber probe
reaches the working setpoint. They are switched on again when
the temperature alls below that set by parameter r0 ("working
setpoint - r0").
The switch-on cycle period is set in seconds by parameter r8.
The switch-on time or each load is calculated as ollows:
Ton = r8 * power/100
To = Ton - r8
The top and loor powers can be linked to each other by setting
parameter r7 to 1 or 2 (this enables the constraint between the
power delivered to the top and the power delivered to the loor).
I r7 = 1, the setting or the power delivered to the top causes
automatic adaptation o the power delivered to the loor, and
vice-versa, so as to guarantee that the sum o the two power
values is always 100.
I , on the other hand, r7 = 2, the power selected or the top
(within the range 0-100%) has priority, so the maximum power
that can be set or the loor must not exceed the remaining
power calculated using the ormula "max. power range - top
power set".
Examples:
- i the top power is set to 80%, the power o the loor can be
set rom 0% to 20% max.
- i the top power is set to 50% and the loor power to 50%, i
the power o the top is increased, rom 50% to 70% or
instance, the power o the loor is automatically decreased
( rom 50% to 30%).
7.2.2 Devices with 2 analogue inputs (top and floor
probes)
This type o device has two di erent independent oven
temperature regulation systems: one operates the top probe,
the other the loor probe, each linked to a top and a loor relay.
Regulation is always ON-OFF: the outputs are switched on,
according to the power set or each one, either together or in
sequence, until the temperature detected by each probe
reaches the working setpoint. They are switched on again when
the temperature alls below that set by parameter r0 ("working
setpoint - r0").
The switch-on cycle period is set in seconds by parameter r8.
The switch-on time or each load is calculated as ollows:
Ton = r8 * power/100
To = Ton - r8
The top and loor powers can be linked to each other by setting
parameter r7 to 1 or 2 (this enables the constraint between the
power delivered to the top and the power delivered to the loor).
I r7 = 1, the setting or the power delivered to the top causes
automatic adaptation o the power delivered to the loor, and
vice-versa, so as to guarantee that the sum o the two power
values is always 100.
I , on the other hand, r7 = 2, the power selected or the top
(within the range 0-100%) has priority, so the maximum power
that can be set or the loor must not exceed the remaining
power calculated using the ormula "max. power range - top
power set".
Examples:
- i the top power is set to 80%, the power o the loor can be
set rom 0% to 20% max.
- i the top power is set to 50% and the loor power to 50%, i
the power o the top is increased, rom 50% to 70% or
instance, the power o the loor is automatically decreased
( rom 50% to 30%).