Nivus osm-f, Инструкция по эксплуатации

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Instruction Manual
OCM F
OCM F - Rev. 04 as of 18.02.2014 Page 35
7.7.4 Control Algorithm
If the regulator function is selected (see also Chapter 9.4.8), relay 4 is used for
“CLOSE SLIDE VALVE“ and relay 5 for “OPEN SLIDE VALVE“ function. This
assignment cannot be modified.
The digital inputs are free programmable for position feedback. To ensure cor-
rect and failsafe slide valve drive necessarily use the messages "PATH OFF“,
"PATH ON“ and "TORQUE CLOSED“ of the slide valve drive.
The input current per digital input is 10 mA.
In case of driving the slide valves via the digital inputs always use all the
3 messages. Activating one message only may result in disturbed regulator
operation.
The regulator can be operated with external or internal set point.
External setpoints have to be routed to analog input 4 (clamps 41+ and
42 GND).
In case of using a 4-20 mA signal as external setpoint, this signal can be moni-
tored for cable breaks and short circuits. If errors should occur the OCM F is go-
ing to access the internal setpoint (

in case of using external 4-20 mA set-
points and error monitoring always set the internal setpoint additionally!).
The following equation applies for the internal calculation of the slide valve con-
trol time:
control time = (setpoint – flow
actual value
) • P_factor •
max. slide valve runtime
max. flow