Operating Condition Restrictions; Manipulated Variable Restrictions - Omron E5AK PROGRAMMABLE TYPE User Manual

4.2 Operating Condition Restrictions

J Manipulated vari-
able restrictions
F MV limiter
F MV change rate
limiter
The upper- and lower-limit values of the manipulated variable can be
restricted by the MV limitter, and the change rate of manipulated vari-
able can be restricted by the MV change rate limitter.
The upper- and lower-limit values of the manipulated variable are set
in the "MV upper limit" and "MV lower limit" parameters (level 2
mode). When the manipulated variable calculated by the E5AK-T is out-
side of the range of the MV limitter, actual outputs are dependent on
the set value of these parameters.
Output (%)
100
0
In heating and cooling control, the manipulated variable at the cooling
side is treated as a negative value for the sake of convenience. The up-
per limit is set for the heating side (positive value), and the lower limit
is set for the cooling side (negative value) as shown in the following fig-
ure.
Output (%)
100
MV lower limit value
MV upper limit value
Heating
side
0
The "MV change rate limitter" parameter (level 2 mode) sets the maxi-
mum permissible change width per second of the manipulated variable.
If a change in the manipulated variable exceeds this parameter setting,
the value calculated by the E5AK-T is reached while changing the value
by the per-second value set in this parameter.
Output (%)
100
0
Switching point

4.2 Operating Condition Restrictions

MV upper limit value
MV lower
limit value
PV
Cooling
side
Set point
1 second
Time
PV
MV change rate
limit value
4--7