Omron E5EK - MANUAL 2 User Manual page 51

CHAPTER 4 APPLIED OPERATION
' Operation at start
Set point
' Restrictions dur-
ing SP ramp
Parameters
4–6
The change rate during the SP ramp is specified by the "SP ramp set value"
and "SP ramp time unit" parameters. At the "SP ramp set value" default
"0", the SP ramp function is disabled.
The set point changing in SP ramp can be monitored in the "Set point dur
ing SP ramp" parameter (level 0 mode).
The limiters are invalid or cannot be set when any of the following condi
tions occurs:
If the SP ramp function is enabled when the power is turned ON, and when
"run" is switched to from "stop," process value may reach the set point af
ter SP ramp in the same way as when the set point is changed. In this case,
operation is carried out with the process value regarded as the set point
before the change was made.
The direction of the SP ramp changes according to the relationship be
tween the process value and the set point.
PV < SP
SP
SP ramp
PV
Power ON
Execution of auto tuning starts after the end of SP ramp.
When the controller is switched to the manual mode, the set point
changes continuously until SP ramp ends.
When the controller is in the stop state or an error occurs, the SP ramp
function becomes invalid.
Symbol Parameter Name: Mode
MV upper limit
MV lower limit
MV change rate limit : Level 2
SP setting upper limit: Expansion
SP setting lower limit : Expansion
SP ramp set value
SP ramp time unit
PV > SP
SP
SP ramp
PV
Set point
Time
Power ON
: Level 2 Manipulated variable restrictions
: Level 2 Manipulated variable restrictions
Manipulated variable restrictions
SP setting restrictions
SP setting restrictions
: Level 2 SP changing restrictions
: Level 2 SP changing restrictions
Same change
rate
Time
Description