Nivus osm-f, Operation Instruction Manual

Page: 32 / 103

Instruction Manual
OCM F
Page 32 OCM F - Rev. 04 as of 18.02.2014
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7.7 Regulator Mode
7.7.1 General
Knowledge in control technologies is necessarily required to correctly and
safely set the regulator!
Typically there are sluice gate valves, knife gate valves or iris gate valves with
electrically driven three-step controller in use. Analog-driven slide valves cannot
be used.
We recommend the following regulating times (time elapsed between valve
completely open and completely closed) for the selection of gate valves:
≤
300 mm (11.8 in) diameter: min. 60 seconds
≤
500 mm (19.7 in) diameter: min. 120 seconds
≤
800 mm (31.5 in) diameter: min. 240 seconds
≤
1000 mm (39.4 in) diameter: min. 300 seconds
For the correct driving as well as for error monitoring of the slide valve, the Way-
End-Switches “OPEN“ and “CLOSE“ as well as the torque switches “CLOSE“
are a mandatory requirement. These signals have to be connected to the digital
inputs 1-3 of the measurement transmitter. Please note to select gold-plated
contacts in order to ensure contact reliability. Connect a signal relay between
switches and measurement transmitter digital input to safely conduct the 10 mA
input current.
Analog position feedback to the measurement transmitter is not planned.
The measurement transmitter OCM F operates as a three-step controller with
surge detection, quick close control, slide valve monitoring and automatic flush
function.
To drive the regulating unit, the relays 4 and 5 are assigned as default. Hence,
relay 4 as “slide valve closed“ and relay 5 as “slide valve open“ are defined.
Analog input 2 is assigned for entering external setpoints (see Fig. 7-19).
The assignment of the digital outputs for the regulator cannot be modified.
The input current on the digital inputs of the OCM F is 10 mA. Please ensure
contact reliability by selecting sufficient contact materials on the end switch of
the control slide valve.