TC10EM
P. 18 / 43
EM-9581-B Rev.1
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: +81(6)6659-8201 Fax: +81(6)6659-8510 E-mail: [email protected]
■
CONTROL TYPE
Specify the control strategy for each loop.
ADDRESS
PARAMETER
RANGE
DEFAULT
195
Loop 1, Control type
0 : Standard PID control
1 : Heating-cooling PID control
2 : Heating-cooling ON/OFF control
0
451
Loop 2, Control type
• Standard PID Control
Typical PID control operation is performed by PID1 P (proportional band), PID1 I (integral time) and PID1 D (derivative time)
set in the selected bank. The Controller automatically adjusts the heating control output (MV) to match the setpoint value
(SP) with the universal input value (PV).
• Heating-Cooling PID Control
PID control is applied to both heating and cooling using PID parameters in PID1 (for heating) and PID2 (for cooling) param-
eters.
PARAMETER
DESCRIPTIONS
SMALLER SET VALUE
LARGER SET VALUE
P
(proportional band)
P output is proportional to the devia-
tion between the input (PV) and the
setpoint (SP).
• Takes shorter time to reach
the target temperature
• Overshooting or cycling
may occur more frequently.
• Takes longer time to
reach the target tempera-
ture
• Overshooting is unlikely
to occur.
I
(integral time)
I output is proportional to the integrat-
ed deviation between PV and SP.
It is used to automatically adjust offset
by P output.
• Takes shorter time to reach
the target temperature
• Overshooting, undershoot
-
ing, or cycling may occur to
a greater degree.
• Takes longer time to
reach the target tempera-
ture
• Overshooting, under
-
shooting, or cycling may
be diminished.
D
(derivative time)
D output is proportional to the deriva-
tive of deviation between PV and SP.
It is used as a corrective action against
changes in PV and SP.
• Overshooting or under
-
shooting may occur to a
greater degree.
• Overshooting or under
-
shooting may be dimin-
ished.
• Small hunting may occur.
• Heating-Cooling ON/OFF Control
The control output is turned on until the universal input (PV) matches the setpoint value (SP) and then turned off. Heating
control is applied when the SP is greater than the PV, while cooling control is applied when the SP is smaller than the PV.
The output is turned on again if the PV is deviated from the SP again, but the sensitivity to react to a deviation can be set for
heating and cooling respectively.
■
DIRECT/REVERSE ACTION
Direct or reverse action can be specified for the standard PID control.
Choose ‘reverse’ action when the MV should be decreased with an increasing PV (typical heating control), and ‘direct’ action
when the MV should be increased (typical cooling control).
Disregarded if the selected control strategy is other than the standard PID control.
ADDRESS
PARAMETER
RANGE
DEFAULT
196
Loop 1, Direct/reverse action
0 : Reverse
1 : Direct
0
452
Loop 2, Direct/reverse action
proportional
band
SP
PV
50%
100%
MV
0%
heating sensitivity
cooling sensitivity
PV
ON
OFF
heating control output
SP
cooling control output