[Hys] Hysteresis Range For On/Off Control (033) - Fuji Electric Micro-Controller X Socket type Operation Manual

Parameter functions and setting procedure
HyS Hysteresis range for ON/OFF control (033)
[Description] –––––––––––––––––––––––––––––––––––––––––––––––––––––––
If you set the control method parameter [CtRL] to " oNoF ," set the hysteresis for on/off control in this parameter.
Setting range
0 to 50%FS
The controllability varies with the size of the hysteresis.
●
Small hysteresis
Large hysteresis
The relationship between SV and hysteresis in normal and reverse operation is shown below.
●
Reverse
Process
Value
SV
PV<SV
ON
Control
Output
OFF
During ON/OFF control, the [i] and [d] settings do not affect control.
●
If the hysteresis width is narrow, and PV and SV are nearly equal, the output may frequently switch on and off.
●
Note that it may affect the life of the contact.
Related parameters: Control algorithm [CtRL] (see page 36)
High-precision control
●
Frequency of output relays is high, so lifespan becomes short.
●
Low-precision control
●
Frequency of output relays is low, so lifespan is relatively long.
●
PV
HYS
PV>SV
Normal
Process
Value
SV
t
ON
Control
Output
OFF
32
PV
PV>SV
PV<SV
HYS
t