User manual - ATR 142
25
ou.d.b.
: Overlapping/Dead band
co.t.c.
: Cooling time cycle
Parameter
p.b.m.
(that ranges from 1.00 to 5.00) determines
the proportional band of cooling basing on the formula:
Cooling proportional band
=
p.b.
*
p.b.m.
This gives a proportional band for cooling which will be the
same as heating band if
p.b.m.
= 1.00, or 5 times greater if
p.b.m.
= 5.00. The
integral time and derivative time
are the
same for both actions.
Parameter
ou.d.b.
determines the overlapping percentage
between the two actions. For systems in which the heating
and cooling output must never be simultaneously active a
dead band (
ou.d.b.
≤ 0) can be configured, and viceversa an
overlapping (
ou.d.b.
> 0).
The following diagram shows an example of dual PID action
(heating-cooling) with
t.i.
= 0 and
t.d.
= 0.
SPV
PV
ATTIVO
ACTIVE
ATTIVO
ACTIVE
P.b.
x
P.b.m.
(COOL)
ou.d.b
< 0
P.b.
(HEAT)
COMMAND OUTPUT (HEAT)
ALARM OUTPUT (COOL)
Summary of Contents for ATR 142 Series
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