Omron E5EK - MANUAL 2 User Manual page 50

' Limiter operation
conditions
+ Set point limiter
Set point
Scaling (sensor) upper-and lower-limit values
+ SP ramp
Set point after
Set point before
The limiters are invalid or cannot be set when any of the following condi
tions occurs:
During ON/OFF control
During AT execution (only by MV change rate limiter)
During manual operation
When operation is stopped
When an error has occurred.
The setting range of the set point is limited by the set point limiter. The
upper and lower limit values of this set point limiter are set in the "Set
point upper limit" and "Set point lower limit" parameters (expansion
mode), respectively. However, note that when the set point limiter is reset,
the set point is forcibly changed to the upper or lower limit value of the set
point limiter if the set point is out of the limiter range. Also, when the in
put type, temperature unit and scaling (sensor) range are changed, set
point limiter is forcibly reset to the scaling (sensor) range.
Setting range
Changed to upper
limit value
Input type changed
Upper-and lower-limit values of the limiter
With the SP ramp function, the controller operates according to the value
(set point during SP ramp) limited by a change rate, instead of the changed
set point when set point is changed. The interval in which the set point
during SP ramp is limited is referred to as the "SP ramp".
SP
SP ramp
change
change
Switching point
4.2 Operating Condition Restrictions
Scaling (sensor) range
Set point limiter
Changed to
the new up-
per limit
value
C
*1 : : Setting possible
: Setting impossible
SP ramp set value
SP ramp time unit
Time
SP
A B
*1
*1
SP
B
*1
4–5