Nor-Cal SDC15 Controller - Manual (Page 63)

5-13
■ MANUAL mode change
The control output when the AUTO mode is changed to the MANUAL mode can
be set.
• When [Output operation at changing Auto/Manual: C19] 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 [Preset MANUAL value: C20] when the AUTO mode is
changed to the MANUAL mode.
• When the control method is other than ON/OFF control (CtrL ≠ 0), [Output
operation at changing Auto/Manual: C19] and [Preset MANUAL value: C20]
can be displayed and set.
• When the Heat/Cool control is not used (C26 = 0), the initial value of [Preset
MANUAL value: C20] 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 manipulated variable (MV).
■ ON/OFF control
The ON/OFF control related items can be set.
• [Differential (for ON/OFF control): dIFF] and [ON/OFF control action point
offset: oFFS] can be displayed and set when the control method is the ON/OFF
control (CtrL = 0).
• The following Figure shows the operation of the ON/OFF control:
● shows that the ON/OFF is changed at this value.
❍ shows that the ON/OFF is changed at a point that "1U" is added to this value.
Chapter 5. DETAILED DESCRIPTION OF EACH FUNCTION
Item (Setting display/bank) Display Contents Initial value User level
Output operation at
changing Auto/Manual
(Setup setting/Setup bank) 0: Bumpless transfer
1: Preset 0 Standard,
High function
Preset MANUAL value
(Setup setting/Setup bank) 0.0 or 50.0% Standard,
High function -10.0 to +110.0%
Item (Setting display/bank) Display Contents Initial value User level
Differential (for ON/OFF
control) (Parameter
setup/Parameter bank) 0 to 9999U 5U Simple,
Standard,
High function
ON/OFF control action
point offset (Parameter
setup/Parameter bank) 0U High function -1999 to +9999U
SP + oFFS
Heat control (Reverse action) Cool control (Direction action)
PV
ON dIFF
SP + oFFS
PV
ON dIFF