NIVELCO EasyTREK SCD-300 Series, Инструкция по установке и программированию

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P27: - - - - Level wane rate (emptying speed) [m/h]
Use these parameters to provide additional protection against echo loss in applications involving dust during the filling process (powders, dusting
granules). Reliability of the measurement can be enhanced by the correct setting of this parameter.
These parameters must not be smaller than the fastest possible filling/emptying rate of the actual technology.
FACTORY DEFAULT: 500
P28 - - - a Echo-loss handling
a
Echo-loss error
indication
Remark
0 Delayed
During short periods of echo-loss, both Eview and the analogue output will hold last value. The current output
holds last value for twice as long as set in P20 before going to the
"
Error Indication Mode
"
set in P12.
1 None During an echo-loss the displayed value on the EView and the analogue output value will hold last value.
2
Advance to full
When echo-loss occurs during filling, the displayed value on the EView and the analogue output value shifts
towards the
"
full
"
tank/silo state with the level elevation rate (filling speed) set in P26
3 Immediate
In case of an echo-loss, ‘no Echo’ will appear in EView and the outputs will change according to the
"
Error
Indication Mode
"
set in P12.
4
No echo-loss
indication in case of
empty tank/silo
Echo-loss may occur in completely empty tanks with a spherical bottom due to deflection of the ultrasonic beam, or
in case of silos with an open outlet. If the echo is lost when the tank/silo is completely empty, the indication will
correspond to empty tank, in all other cases echo-loss indication will function according to the “Delayed”.
FACTORY DEFAULT: 0
HART
Current output
Holding value
Holding value
Error Code 2
Current 22 mA P12=2
Holding last value P12=0
Current 3,6 mA P12=1
Echo loss
Echo LED goes out
2 * ”P20” time