YOKOGAWA UT550 User Manual

3-10
<Toc> < 3. Operations >
IM 05D01C02-41E 3rd Edition: May 31, 2006-00
● Controller behavior and control output manipulation when the dead band
is positive
The following is an example when the DB parameter is set at 12.4%.
If you hold down the
key with the heating-side output under manipulation (i.e., cooling-
side output C = 0.0%), the heating-side output (H =) decreases.
Consequently, both the heating-side and cooling-side outputs change to 0.0%. If you keep
the
key held down longer, you enter the state of manipulating the cooling-side output,
and its value begins to increase.
Inversely, if you hold down the
key with the cooling-side output under manipulation (i.e.,
heating-side output H = 0.0%), the cooling-side output (C =) decreases. Consequently,
both the heating-side and cooling-side outputs go to 0.0%. If you keep the
key held
down longer, you enter the state of manipulating the heating-side output, and its value
begins to increase.
Cooling-side
manipulated output
Heating-side
manipulated output
Output (%)
DB=12.4
Dead band:
Operating parameter DB
12.40-12.4
Change in manipulated output when the dead band is positive
● Controller behavior and control output manipulation when the dead band
is negative
The following is an example when the DB parameter is set at -12.4%.
If you hold down the
key with the heating-side output under manipulation (i.e., cooling-
side output C = 0.0%), the heating-side output (H =) decreases. If the output H falls below
24.8%, the cooling-side output C begins to increase from 0.0%. If you keep the
key
held down longer and the output C rises above 24.8%, the output H goes to 0.0% and you
enter the state of manipulating the cooling-side output.
Cooling-side
manipulated output
Heating-side
manipulated output
Output (%)
24.8
DB=-12.4
12.40-12.4
Change in manipulated output when the dead band is negative

YOKOGAWA UT550 Specifications

General

Brand	YOKOGAWA
Model	UT550
Category	Controller
Language	English