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4
Chapter
ON/OFF Control Hysteresis
Settings for ON/OFF Control (2 position)
• Range: 0.0% to 50.0% FS
The control method varies with the size of the hysteresis.
The relationship between SV and hysteresis in normal and
reverse operation is shown below.
Setting ON/OFF Control Hysteresis
Small hysteresis
• High-precision control
• Frequency of output relays is high, so
lifespan is short
Large hysteresis
• Low-precision control
• Frequency of output relays is low, so
lifespan is long
Point
• During ON/OFF control, the i and d settings do not
affect control.
• The function operates as follows for manual operation during
ON/OFF control:
Press the
key: MV = 100%
Press the
key: MV = 0%
• If the hysteresis width is narrow, and PV and SV are
nearly equal, the output may frequently switch on and
off. Note that doing so may affect the operation life of
the contact output.
PV
ON
OFF
Control
Output
t
SV
SV-HYS
Set Value
HYS
Reverse
PV
ON
OFF
Control
Output
t
SV
SV+HYS
Set Value
HYS
1
Press and hold the
key to display the setup
mode channel menu ("
ooo
oPPPPEEEE CCCChhhh 1111
"), then use the
keys to display Pid ("
PPP
Piiiidddd CCCChhhh 2222
").
Refer to
See p. 31 in this chapter for information on how to display
the channel menu.
2
Press and hold the
key to display P ("
PPP
P
") then
use the
keys to display hYS ("
hhh
hYYYYSSSS
").
ON/OFF control hysteresis is activated.
3
Press the
key, then use the
keys to set
the ON/OFF control hysteresis to "2.5".
The hysteresis is set to "2.5°C".
4
Press the
key to confirm the setting.
5
Press the
key to return to the operation mode
PV/SV display.
Normal
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Страница 154: ...153 17 Chapter Chapter 17 Appendix Delay Start Function 154 Return to Factory Default Setting Function 155...
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