YOKOGAWA UT130, Техническая информация

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6-8
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TI 05C01E02-01E 1st Edition : Oct. 31, 2001-00
6.6 Control Output
6.6.1 Time Proportional PID Output (Relay Output / Voltage Pulse Output)
•
This function is available for UT130-RN
or -VN, UT15X-RN or —VN.
•
In time proportional PID, the PID
computation result is output in the form
of an ON/OFF signal pulse width.
•
The fraction of the cycle time (shown
below) during which output is ON (ON-
time ratio) is proportional to the displayed
output value (PID computation value).
•
This function is primarily used in
electrical heating control.
Contact rating:
250V AC, 3A (resistance load)
ON voltage: 12V DC
OFF voltage: 0.1V DC or less
(Load resistance: 600
‰ or more)
Relay
output
Voltage
pulse
output
UT130/UT150
Heater
Tank
SSR
ON/OFF signal
pulse signal
ON-time ratio
Displayed output value (%)
100
0
0.0 100.0 50.0
ON
OFF
ON
OFF
T/C
6.6.2 Cycle Time
•
This function is available in time
proportional control.
•
Cycle time is the basic cycle period for a
signal full cycle of ON/OFF operation for a
relay or voltage pulse output.
•
Reducing cycle time results in faster
cycling and finer control. In general,
setting about one tenth of the time
constant of control object is standard.
•
For relay output, 20 seconds or more of
cycle time is recommended for relay life.
•
Cycle time can be set using the setup
parameter "CT". Cooling-side control
output cycle time can be set using the
setup parameter "CTC".
1 to 240 sec
CT
CTC
Parameter Range
Cycle time
ON
OFF
ON
OFF
Cycle time
ON time
When control output = 50%
ON time = 5 sec
OFF time = 5 sec
When control output = 70%
ON time = 7 sec
OFF time = 3 sec
When control output = 50%
ON time = 10 sec
OFF time = 10 sec
When control output = 40%
ON time = 6 sec
OFF time = 14 sec
Comparison between 10 sec and 20 sec of cycle times Example:
Cycle time=20 sec
ON
OFF
Cycle time=10 sec
ON
OFF