Endress+Hauser Silometer FMC 672 Z, Инструкция по установке и эксплуатации

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Two-point operation with
one relay If a particular level or volume range has to be maintained, this can be achieved by setting
an appropriate maximum (or minimum level) and hysteresis. For example, the relay is
set to maximum fail-safe mode.
•
Set the switch point to maximum permissible volume or level.
•
Set the hysteresis to the level or volume difference you want to control.
The level rises until the maximum is exceeded, at which point the relay triggers and the
pump is switched off. The relay energises again when the
•
maximum level - hysteresis
has been reached: the pump switches on again.
Step Matrix Entry Significance
1 V1H0 e.g. 1900 Switch point 1 = 1900
2 - »E« Register entry
3 V1H1 1 Maximum fail-safe mode
4 - »E« Register entry
5 V1H2 e.g. 400 Hysteresis = 400, the relay energises again at level = 1500
6 - »E« Register entry
Level
Hysteresis
e.g. 400
Switchpoint
e.g. 200
Relay de-energised energised de-energised time
BA064E35
z18 d20 z20
z22 d24 z24
z18 d20 z20
z22 d24 z24
z18 d20 z20
z22 d24 z24
Fig. 7.1:
Two-point operation with
minimum fail-safe mode
Level
de-energised energised de-energised
Switch point
e.g. 1900
Hysteresis
e.g. 400
Relay time
z18 d20 z20
z22 d24 z24
z18 d20 z20
z22 d24 z24
z18 d20 z20
z22 d24 z24
BA064E36
600
1500
Fig. 7.2:
Two-point operation with
maximum fail-safe mode
Silometer FMC 672 Z/677 Z Chapter 7: Limit Switches
39