Yamatake SDC35, Руководство пользователя

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5-16
Chapter 5. DETAILED DESCRIPTION OF EACH FUNCTION
■
MANUAL mode change
The control output when the AUTO mode is changed to the MANUAL mode can
be set.
• When [C19: Output operation at changing Auto/Manual] is set at [0: Bumpless
transfer], the manipulated variable (MV) when the AUTO mode is changed to
the MANUAL mode is retained. When set at [1: Preset], the manipulated
variable (MV) is set to [C20: Preset MANUAL value] when the AUTO mode is
changed to the MANUAL mode.
• When the control method is other than ON/OFF control (CtrL
≠
0), [C19: Output
operation at changing Auto/Manual] and [C20: Preset MANUAL value] can be
displayed and set.
• When the Heat/Cool control is not used (C26 = 0), the initial value of [C20:
Preset MANUAL value] is [0.0]. On the contrary, when the Heat/Cool control is
used (C26 =1), this initial value becomes [50.0].
Handling Precautions
When the unit is in the MANUAL mode if the power is turned ON, the
set value of C20 becomes the initial manipulated variable (MV).
■
PID control initialization
• When the control method is other than the ON/OFF control (CtrL
≠
0), the display
and setting can be performed.
• If the PID group is changed as the SP value or SP group is changed, the
manipulated variable (MV) is stopped at its low limit or high limit, and then the
PV may not change or may overshoot. To prevent such trouble, it is effective to
initialize the PID control.
• The setting is “0” (Auto).
It is judged automatically whether or not the PID control needs to be initialized
as the SP value or SP group is changed. As a result, the PID control is initialized
only when it is required.
• The setting is “1” (Not initialized).
Even though the SP value or SP group is changed, the PID control is not
initialized. This setting is effective when the continuation of the manipulated
variable (MV) is important if the SP value or SP group is changed.
• The setting is “2” (Initialized).
Every time the SP value or SP group is changed, the PID control is always
initialized. This setting is effective when it is important that an increase or a
decrease in manipulated variable (MV) immediately affects the relationship
between the PV and SP when the SP value or SP group is changed.
Item (Bank) Display Contents Initial value User level
Output operation at
changing Auto/Manual
(Setup bank) 0: Bumpless transfer
1: Preset 0 Standard,
High function
Preset MANUAL value
(Setup bank) 0.0 or 50.0% Standard,
High function
-10.0 to +110.0%
Item (Bank) Display Contents Initial value User level
Initial output type (mode)
of PID control
(Setup bank) 0: Auto
1: Not initialized.
2: Initialized. (If SP value different from the
current value is input.)
0 High function