6-16
<Toc>
<6. Parameters>
IM 05E01D02-41E
■
Cycle Time
A cycle time can only be set if the type of control output is time proportional PID relay output
or time proportional voltage pulse output.
A cycle time refers to one period consisting of on- and off-state time lengths. The ratio of
the on-state time to the off-state time differs according to the value of the control output.
The figure below shows on-to-off time ratios of the control output when the cycle time is set
to 10 seconds. Setting a shorter cycle time allows the controller to perform elaborate
control at short time intervals. This significantly reduces the on- and off-state times, how-
ever it shortens the service life of a relay.
Cycle time (CT): Setup parameter
On
Off
Cycle time
On
Off
Cycle time
Relay’s Behavior when Cycle Time = 10 sec.
For 20% of Control Output
For 50% of Control Output For 80% of Control Output
On-state duration: 2 sec.
Off-state duration: 8 sec.
On-state duration: 5 sec.
Off-state duration: 5 sec.
On-state duration: 8 sec.
Off-state duration: 2 sec.
10 sec.
10 sec.
10 sec.
■
Limiting the Control Output (Output Limiter)
As shown in the figure below, you can set the high and low limits within the range of control
output to restrict the control output. This feature is disabled, however, when the controller is
at a stop (RESET state).
Output high limit (OH) : Operating parameter
Output low limit (OL) : Operating parameter
105%
-5%
Actual control output
Output low limit (OL)
Output high limit (OH)
0%
100%
Control output value
1st Edition : May 31,2000-00
Summary of Contents for UP350
Page 2: ...Blank Page ...
Page 52: ...Blank Page ...
Page 62: ...Blank Page ...
Page 72: ...Blank Page ...
Page 94: ...Blank Page ...
Page 96: ...Blank Page ...