YOKOGAWA UP35A - Page 132

8-15
IM 05P02D41-01EN
Control Functions
WhentheHeatingSideisinPIDControlandtheCoolingSideisinON/OFFControl:
The following shows the formula and operation example.
HOUT = ( OUT – – 50% ) × 2
2
DB
*: OUT: control output, HOUT: heating-side control output,
COUT: cooling-side control output, DB: dead band, and
HYSc: cooling-side hysteresis
COUT = OUT < ( 50% – – )
OUT > ( 50% + + )
Other than these cases, maintain current state.
Output turns on when
Output turns off when
2
DB
2
HYSc
2
DB
2
HYSc
Positive Dead Band
0%
Dead band
(DB)
Dead band
(DB)
Cooling-side control output (%) Heating-side control output (%)
0%
50%
Control computation output
100%
100%
Heating-side
control output
high limit
(OH)
0%
100%
0% 50% 100%
Hysteresis (HYSc)
(OUT)
Negative Dead Band
0%
0%
50% 100%
100%
0%
100%
0% 50% 100%
Dead band
(DB)
Dead band
(DB)
Cooling-side control output (%) Heating-side control output (%)
Control computation output
Heating-side
control output
high limit
(OH)
Hysteresis (HYSc)
(OUT)
8
8.2SettingControlType(CNT)