YOKOGAWA UT350-01 User Manual

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IM 05D01D02-41E 4th Edition: May 31, 2006-00
■ Heating/Cooling Control (for a Heating/Cooling Controller Only)
In heating/cooling control, the controller outputs the result of computation after splitting it
into heating-purpose and cooling-purpose signals. In addition, the controller can perform
PID control or on-off control on the heating and cooling sides separately. When performing
on-off control, set the proportional band to “0”.
The controller splits the result of computation (0 to 100%) into heating-side and cooling-
side signals, as described below.
• 0% to 50% of the computation result is presented as a 0% to 100% cooling-side
output.
• 50% to 100% of the computation result is presented as a 0% to 100% heating-side
output.
PID computation
0% to 100%
Heating/cooling
computation
0% to 50%
Cooling-side
output limiter
Cooling-side MV
output 0% to 100%
Heating-side MV
output 0% to 100%
50% to 100%
Heating-side
output limiter
PV
SP
Manual MV output
Communication
Heating/cooling control provides two methods in which either none of the heating- and
cooling-side outputs are presented or both of the heating- and cooling-side outputs are
presented, as shown in the following figures.
00
Cooling-side
output
Cooling-side
output
Heating-side
output
Heating-side
output
Output (%)
100
Output (%)
100
Deadband (negative)Deadband (positive)
100(%) 100(%)50
50
0
0
Value of control output before split into heating- and
cooling-side outputs
Value of control output before split into heating- and
cooling-side outputs
Precautions in Heating/Cooling Control
• Keep the ratio of the heating-side proportional band (P) to the cooling-side propor-
tional band (Pc) equal to or below 5.
• If neither the heating side nor the cooling side is performing on-off control, setting the
integral time (I or Ic) of one side to “0” results in the Integral Time parameters of both
sides being set to “OFF”, irrespective of the integral time setting of the other side.
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YOKOGAWA UT350-01 Specifications

General

Brand	YOKOGAWA
Model	UT350-01
Category	Controller
Language	English