Operating Condition Restrictions; Mv Limiter; Mv Change Rate Limiter; Manipulated Variable Restrictions - Omron E5AK 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 limiter, and the change rate of the manipulated
variable can be restricted by the MV change rate limiter.
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 is outside of the
range of the MV limiter, 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
upper 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 follow-
ing figure.
Output (%)
100
MV lower limit value
MV upper limit value
Heating
side
0
The "MV change rate limit" 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 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--5