Nor-Cal SDC15 Controller - Manual (Page 80)

■ SP up ramp/down ramp
The SP up ramp and down ramp can be set.
• When an initial value of “0.0U” is set, the SP ramp function does not function.
Therefore, when the up ramp setting is set to “0.1U” or more and the down ramp
is set to “0.0U”, the SP ramp functions only during SP up and the SP ramp does
not function during SP down. Additionally, the reverse operation can also be set
so that the SP ramp functions only during SP up and it does not function during
SP down.
• "0.1U" shows that the decimal point position of the PV is shifted one digit
rightward.
Example: When the thermocouple input is in a range of -200 to +1200˚C, "0.1U"
is "0.1˚C ".
Example: When the DC voltage input is in a range of 0.0 to 100.0, "0.1U" is
"0.01".
• The ramp is started assuming that the current PV value is used as start point
when any of the following conditions is satisfied:
The power is turned ON.
READY+AUTO status is changed to RUN+AUTO status.
RUN+MANUAL status is changed to RUN+AUTO status.
The AT function is completed (both normal end and forced stop).
■ SP low limit/high limit
The SP low limit and high limit can be set to limit the SP range.
Handling Precautions
When the PV input range type (setup C01) is set, the SP low limit and
high limit are initialized.
5-30
Chapter 5. DETAILED DESCRIPTION OF EACH FUNCTION
Item (Setting display/bank) Display Contents Initial value User level
SP up ramp
(Parameter
setting/Parameter bank) 0.0U: No ramp
0.1 to 999.9U
(The unit of the ramp time is selected using
the SP ramp unit.)
0.0U High function
0.0U SP down ramp
(Parameter
setting/Parameter bank)
Item (Setting display/bank) Display Contents Initial value User level
SP low limit
(Setup setting/Setup bank) PV input range low limit to PV input range
high limit PV input range low
limit Standard,
High function
SP high limit
(Setup setting/Setup bank) PV input range low limit to PV input range
high limit PV input range high
limit Standard,
High function