35
3-5
Output Limitations
The upper and lower limits for the output value are limited by an output limiter
and the output change rate is limited by an output change rate limiter.
3-5-1 Output Limiter
If the output value calculated by the E5ZE is outside the range of the output limit-
er, the actual output will be restricted to the specified upper or lower limit.
Output value (%)
Output limiter
Upper limit
Output limiter
Lower limit
•
Set the upper limit and the lower limit within the range of 0.0% to 100.0%.
•
The lower limit cannot be set to a value greater than the upper limit.
•
If the lower limit is 100.0, the output value will be 100.0%.
•
If the upper limit is 0.0, the output value will be 0.0%.
•
If the upper limit is equal to the lower limit, the output value will be equal to the
output limits.
3-5-2 Output Change Rate Limiter
The change in output value during one sampling period (approx. 200 ms) is lim-
ited by the output change rate limiter. If the output value calculated by the E5ZE
changes too quickly, the actual output will be that allowed by the setting of the
output change rate limiter and will gradually change until it reaches the calcu-
lated output value.
Output value (%)
Time
Point of change
Calculated output value
Change rate
limit value
200 ms
•
The change rate limit setting range is between 0.0% and 100.0% per 200 ms.
The change rate limiter is disabled if the value is set to 0.0 (default).
•
Use the following formula to calculate and set the change rate limit when the
change rate is A% for 1 s of output.
Standard Control Models:
A x 0.2
Heating and Cooling Control Models:
A x 0.2 x 0.5
•
The output change rate limiter will operate for both heating control and cooling
control.
Output Limitations
Section 3-5
