Setting The Switching Delay; Min And Max Failsafe Mode - Endress+Hauser Liquicap M FTI51 Operating Instructions Manual

Commissioning
66
7.4.4

Setting the switching delay

NOTICE
The tank can overflow if the switching delay is set for too long.
‣
The switching delay causes the device to signal the point level after a delay. This is
useful in tanks with turbulent medium surfaces caused by the filling process or by
collapsing mounds. Ensure that the filling of the tank does not end until the probe is
continuously covered by the medium.
A switching delay that is too short can cause the filling process to be restarted as soon
as the medium surface settles.
Switching delay:
 51 5 s
 52 1 s
7.4.5

MIN and MAX failsafe mode

By selecting the failsafe mode correctly, you ensure that the output always operates
safely with quiescent current.
Minimum failsafe mode (MIN)
The output switches if the switch-point is undershot (probe uncovered), a fault occurs or
the line voltage fails.
Maximum failsafe mode (MAX)
The output switches if the switch-point is exceeded (probe covered), a fault occurs or the
line voltage fails.
Fail-safe mode:
 53 The output switches safety-oriented when the probe is uncovered. It can be used in cases such as dry run
protection and pump protection.
 54 The output switches safety-oriented when the probe is covered. It can be used in cases such as overfill
protection.
MIN
MAX
Liquicap M FTI51
A0042408
A0042409
A0042410
A0042411
Endress+Hauser