Start-Up Delay (Dst) - IFM Electronic SU0502 Bedienungsanleitung

Technical information / Functioning / Parameters

Start-up delay (dSt)

Example dSt with
hysteresis function:
Page 28
If the start-up delay is active (dSt > 0), the following conditions apply:
As soon as the flow has reached the value 3% of the final value (FV)
• the start-up delay starts and
• the outputs are switched according to the programming: ON with
the NO function (Hno / Fno), OFF with the NC function (Hnc / Fnc).
During the start-up delay 2 cases are possible:
• fast increase of flow, switch point / acceptable range are
reached within dSt → outputs remain active.
• slow increase of flow, switch point / acceptable range are not
reached (or flow falls below 3%) within dSt → outputs are reset.
1 2
Q
SP
rP
3%
dSt
1
0
1
0
flow reaches 3% of the final value (FV) → dSt starts, the output
1
becomes active
dSt has elapsed, flow has reached SP → the output remains active
2
flow falls below SP but remains above rP → the output remains active
3
flow falls below rP → the output is reset
4
flow reaches 3% of the final value again → dSt starts, the output
5
becomes active
dSt has elapsed, flow has not reached SP → the output is reset
6
flow reaches SP → the output becomes active
7
3 4 5
dSt
6 7
t
Hno
Hnc