Yamatake SDC35, User Manual

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5-17
■
Initial output of PID control
• When the control method is other than the ON/OFF control (CtrL
≠
0), the display
and setting can be performed.
• This value is used for the PID control immediately after the operation mode is
changed from READY to RUN or the operation mode becomes RUN as the
power is turned ON. This value greatly affects the manipulated variable (MV)
when the operation mode is changed.
• When the setting of the Heat/Cool control (C26) is changed, the value is
automatically set again. When [C26: Heat/Cool control] is changed to “Enabled”
(C26=1), the value becomes “50.0%”. On the contrary, when the setting is
changed to “Disabled” (C26=0), the value becomes “0.0%”.
■
PID decimal point position
• When the control method is other than the ON/OFF control (CtrL
≠
0), the display
and setting can be performed.
• When this setting is set at “0”, the integral time and derivative time settings
become 0 to 9999s.
• When this setting is set at “1”, the integral time and derivative time settings
become 0.0 to 999.9s.
Handling Precautions
When the setting of the PID decimal point position is changed, the
integral time and derivative time values are divided by 10 (1/10) or
multiplied by 10, and the control characteristics may be changed
greatly.
After the setting has been changed, always set the integral time and
derivative time to an appropriate value again.
For example, if the setting of the PID decimal point position is changed
from “0” to “1” with integral time of 120s, the integral time becomes
12.0s.
Chapter 5. DETAILED DESCRIPTION OF EACH FUNCTION
Item (Bank) Display Contents Initial value User level
Initial output of PID control
(Setup bank) –10.0 to +110.0% 0.0% or 50.0% High function
Item (Bank) Display Contents Initial value User level
PID decimal point position
(Setup bank) 0: No decimal point
1: 1 digit after decimal point
(Decimal point of integral time and
derivative time)
0 High function