GEA T.VIS M-15, Operating Instruction

Page: 19 / 120

3.2 Functional description
3.2.1 Operation Principle
The control top T.VIS M-15 works with a microprocessor that contains the
software for operation, visualization and intelligent position detection.
Pneumatic and electronic modules are located inside the control top. The
pneumatic modules in this case are solenoid valves, the number of which varies
between 0 and 3, depending on the intended purpose. A logic element NOT can
be used for pressure backup of the actuator spring. Control air is supplied to the
relevant control air chambers via air connections at the outside of the control top.
On VARIVENT valves and ECOVENT standard valves, the main control air is
guided through the switch bar. On process valves which do not allow the air to be
guided internally, the main control air is supplied to the actuator via a hose
connected to a separate air connection. The exhaust air of the main actuator is
discharged via an air connection with sound absorber or optionally via an
adjustable exhaust air throttle. Exhaust air from the optional lifting actuators is
discharged from the control top via a venting diaphragm and via a non-return
valve.
The main task of the 24 VDC interface module with its sensors is to determine
the valve position on the basis of the position of the valve stem and to generate
the corresponding feedback signals for this position in order to send them to a
higher-level control system.
Due to the illuminated dome integrated in the cap of the control top the light
emitting diodes (LED) arranged on the interface module can be seen even if the
cap is closed. The 2 differently coloured LEDs allow visualization of the main
functions of the valve.
Visualization:
• Valve in non-actuated position – green
• Valve in actuated position – yellow
• Valve deviating from its adjusted actuated positions – yellow flashing
•
Valve idle – no indication
The basic 24 VDC equipment can be upgraded to the interface modules AS-
Interface or DeviveNet, simply by fitting an adapter module.
3.2.2 Control Top without Solenoid Valves
The control top T.VIS M-15 without solenoid valves works as a position indicator.
Once the two sensors have been adjusted, the control top indicates the status of
the process valve locally by coloured LEDs under the illuminated dome so that it
is visible over a long distance.
The position feedback signals are supplied to the user in one of the following
ways, depending on the communication method selected:
• 24V DC switching output
•
AS interface data bit
• DeviceNet data bit
Description
Functional description
430BAL010697EN_2
15.04.2020 19