UR3274U - User manual
23
Parameter
ou.d.b.
determines the percentage overlapping
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 figure shows an example of dual action PID
(heating-cooling) with
t.i.
= 0 and
t.d.
= 0.
SPV
PV
ACTIVE
ACTIVE
P.b.
x
P.b.m.
(COOL)
ou.d.b
< 0
P.b.
(HEAT)
COMMAND OUTPUT (HEAT)
ALARM OUTPUT (COOL)
SPV
PV
ACTIVE
ACTIVE
P.b.
x
P.b.m.
(COOL)
ou.d.b
= 0
P.b.
(HEAT)
COMMAND OUTPUT (HEAT)
ALARM OUTPUT (COOL)
