84
APT4000PH
Controller functions
Pulse length / pulse frequency controller
Pulse length controller (PLC)
The pulse length controller is used to operate a valve as an
actuator. It switches the contact on for a time that depends on
the controller output. The period is constant. A minimum ON
time of 0.5 sec is maintained even if the controller output takes
corresponding values.
Pulse frequency controller (PFC)
The pulse frequency controller is used to operate a frequency-
controlled actuator. It varies the frequency with which the con-
tacts are switched on. The maximum pulse frequency [pulses/
min] can be defined. It depends on the actuator.
The Contact ON time is constant. It is automatically calculated
from the user-defined maximum pulse frequency:
Output signal (switching contact) of pulse frequency controller
ON time
Pulse frequency (Y = 20%)
1
0
1
0
Pulse frequency (Y = 80%)
Output signal (switching contact) of pulse length controller
ON time (Y = 80 %)
ON time (Y = 20 %)
Pulse length
1
0
1
0
85
Operation with automatic cleaning system
The APT4000PH allows connection of an automatic cleaning
system. The cleaning cycle is activated according to the clean-
ing interval defined during configuration (Pg 59).
17
18
Wash
e.g. splash cleaning
Power supply
17
18
Wash
7
8
Control
-
+
Automatic
cleaning
system
Connecting a rinsing system
The “Wash” contact can be used to connect a simple splash
cleaning system. Rinse time and rinsing interval are defined
during configuration (Pg 58).
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