Controller functions
42
UPT-640 (as of SW 100)
The possible settings are shown below:
6.
"Active if Tact = Tset"
Relay K1 is activated if the actual value is inside the
specified temperature tolerance band (steps 207,
208). If the actual temperature is outside the toler-
ance band, relay K1 is deactivated (see graph
below).
7.
"Active if Tact = Tset", with latch function
Relay K1 is closed if the actual value is inside the
specified temperature tolerance band (steps 207,
208). If the actual temperature leaves the tolerance
band once during the heatsealing phase, relay K1 is
opened. The relay is not closed again until the next
"START" signal is activated. The switching state of
relay K1 can thus also be interrogated by the higher-
level PLC after a heatsealing process (latch func-
tion, see graph below).
ACTUAL
temperature
START
signal
24VDC
T
t
t
0
0
95% of set point
When start
signal present
t
0
Relay K1
When
temperature
t
0
reached
end of cooling
t
0
While
cooling
t
0
End-of-
cycle
impulse
500ms
Set
NO contact of
Setl+
Δϑ
lower
Set+
Δϑ
upper
Actual value
Time
Time
Open
Closed
Relay K1
Set
NO contact of
Set+
Δϑ
lower
Set+
Δϑ
upper
Actual value
Time
Time
Open
Closed
Relay K1
