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Valve outputs | Valve output - General
PWM cycle time
The "PWM cycle time" parameter specifies the switching frequency of the pulse-
width-modulated output signal of the valve output. It allows adaptation to the adjust-
ing cycle times (the adjusting time it takes the drive to bring the valve from its com-
pletely closed to its completely opened position) of the valve drives used. In addition
to the adjusting cycle time, take account of the dead time (the time in which the actu-
ators do not show any response when being switched or off). If different actuators
with different adjusting cycle times are used at an output, take account of the longest
of the times.
The "PWM cycle time" parameter is always available, irrespective of the data format
and the activation type, because, in the case of an active forced position, emergency
operation, after voltage return or after an ETS programming operation, the output is
controlled with pulse width modulation for which, as a result, the specification of a
cycle time is required.
Valve
In voltage-free state (direction of action)
Valve drives that are closed or open when deenergised can be connected. On each
electrical activation of the valve outputs, the actuator takes the valve direction of ac-
tion configured here into account, so that the command value presettings (Valve
closed OFF, 0% / Valve opened ON, 1...100%) can be executed in the correct direc-
tion of action. The valve outputs are no longer energised if the valve voltage supply
fails or if there is a short-circuit or overload. The actuator takes this state into ac-
count and also influences the command value feedback, according to the configured
valve direction of action.
Heating actuator 6-gang with controller | Order no. 2139 00 | 21393100
0.5 minutes
1 minute
1.5 minutes
...
15 minutes
...
20 minutes
closed
open
Page 77 of 257
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