YOKOGAWA ADMAG TI Series

<5. Functions>
83
IM 01E21A02-03EN
*1: Fromthetablebelow,selectthenoiselter(ratelimitvalueanddeadtime).
Selection
Rate limit value Dead time
Display
F
OUNDATION
Fieldbus
Manual Manual
Thevalueisspeciedinthe
parameter“Ratelimit”.
Thevalueisspeciedinthe
parameter“Deadtime”.
Level 1 Level 1 0.5% 0.5s
Level 2 Level 2 1.0% 1.0s
Level 3 Level 3 5.0% 3.0s
NOTE
Ifeithertheratelimitvalueorthedeadtimeisspecied,thenoiselterissetto“Manual”.
NOTE
Determining the rate limit value and dead time
F0420.ai
T 0
T 0
2%
2%
The Rage limit value:
Determine the level which should be cut the output
fluctuation. For example, if its level is 2%, the noise of 2%
or larger would be cut as shown in the following figure.
The Dead time (T
0
):
Determine the value depending on the width of the output
fluctuation. Choose the larger value when the noise which is
over the dead time as shown in the following figure.
NOTE
Fortheratelimitfunction,thedeadtimeissetto“0”atshipmentfromthemanufacturingfactory.
Be sure to set the dead time when the rate limit function is used.
Signal processing for rate limit function
Theproductcalculatestosetthespecicratelimitvaluetotheprimarydelayresponsevalueof
thepreviouslysampledowratevalue.Iftheowratevaluesampledatthistimeexceedsthe
ratelimitvalueabove,itshighorlowlimitissettotheowratevalueatthistime.Furthermore,
if the sampling count occurs within the dead time while the signal over the high/low limit is in the
samedirection,thissignalisjudgedtobeaowratesignal.