DE29718099U1 - Bus control system for monitoring and controlling motorized fire protection and smoke extraction dampers with locally installed modules that are connected to bus lines - Google Patents

Description

Stanzick; St. Tönnisstrasse38;.§0769K3lni

general description

Control of motorized fire protection or smoke extraction dampers via a bus system with bus modules installed on site.

When large buildings are constructed, a ventilation system is usually installed. Since the ventilation ducts pass through fire compartments (e.g. from floor to floor), fire dampers or smoke extraction dampers are installed in the ventilation ducts so that no flames or smoke can reach other areas in the event of a fire.

In order to specifically control these flaps, motors are installed on the flaps. To keep the cable laying effort as low as possible (fire loads), a bus system is installed to control and monitor the motors. The motors are controlled, the open/closed limit switches indicate the current flap position. A connected thermocouple warns of increased temperatures and when triggered, the motor moves the flap to a safety position. The motors are controlled and the limit switches are displayed at a control center (e.g. fire brigade control panel).

The power supply to the motors is usually carried out in a star configuration so that not too many motors fail in the event of a fault.
This type of cabling results in very high costs.

If an error occurs in the bus system, e.g. a wire break or short circuit, the entire bus system will be put out of action.

The motors can no longer be controlled or monitored. For this reason, such bus systems are rarely used.

The motors can also no longer be operated due to a broken wire or a short circuit in the supply line (power supply).

Gerhard Stanzick; St. Tönnisstraße:38r^5076KKöln: . ·..: .·

Description with protection claims

1. The new, intelligent modules ensure optimal functionality in the bus system area (control line) and in the supply line (power supply).

If a bus line is interrupted or faulty, this error has no effect on the overall function of the system, as it is laid out in a ring and each module is therefore supplied from two sides. The location of the fault is located, displayed and rectified by the control center.

For example, a short circuit in the bus line is detected by the control unit and the modules. Each module physically disconnects the bus line via a relay.

The control center now addresses the 1st module in the bus system and asks it to reconnect the bus connection to the next module. If there is no bus error after connecting the bus to the 2nd module, the 2nd module is asked to establish the connection to the 3rd module. If an error is now detected, all modules switch off from the bus again. Since the control center remembers the position or address of the faulty section or module, this section is no longer connected from this side when the connection is reestablished.

The rest of the connection is connected in the ring bus from the other side. The result is that only the defective line section is disconnected from the bus, all other modules continue to function. If a module is faulty without affecting the physical bus, this is detected and signaled by the control center. However, if a fault affects the bus line, e.g. by increasing the current, this is detected by the control center and the two adjacent modules to the right and left are requested to disconnect the connection to the defective module.

2. The supply line (power supply) of the motors is also designed as a ring bus and wired via the modules.
The power supply is constantly monitored by the control center using an additional current measuring module. The control center monitors the permissible current and detects a possible overcurrent. Here, too, each module can disconnect the power supply line using a relay.

Just as in the event of a bus system failure, the connections are switched in such a way that the defective line section is separated. Only with this procedure is it possible to lay a ring bus cable for the power supply and thus save considerable costs.

Gerhard Stanzick; St. Tönnisstrasse 3S;*5Q769 Cologne . *..:

3". Another innovation of these modules is the separation of the cable connection terminals from the electronics.

In conventional modules, the terminals and electronics are on a
Circuit board (base plate). This has the disadvantage that after the wiring, checking or measuring the laid cables can only be carried out with a great deal of technical effort, since the electronic components always distort the measurement result in all measurements.

Furthermore, incorrect wiring can cause a short circuit, which in the worst case can result in the destruction of the electronics.

In the new modules, all terminals for the cables are on a separate circuit board (base plate).

After connecting the cables, they can now be tested and measured as desired without any electronic interference.

Test voltages of up to 1000V can be applied without destroying the electronics.

After completion of the testing work, the electronic boards are
Plug strip connected to the terminals.
The system is then immediately ready for operation.

4. Another innovation is the possibility to switch the shutdown functions for the ring bus systems centrally "on or off".

The advantage of this function is that the system can only be "armed" after a complete manual test of cables, modules, etc.
If this function were not available, it would not be possible to carry out any testing work on the system (e.g. measuring and disconnecting individual wires) without the control panel recognizing an error or a fault and the section
separates.

Posted on 08^4:1997

Gerhard Stänzick

Claims (4)

Gerhard Stanzick; St. Tönnisstraß^ 3^ ·§0.76'&xgr;&xgr;&idiagr;&phgr;&idiagr;&eegr;· , ·..: .·' Protection claims Bus control system for monitoring and controlling motor-operated fire protection or smoke extraction dampers with locally installed modules that are connected to bus lines. 1. Intelligent bus modules that are connected to a ring bus control line from a central unit, which can be specifically localized, controlled and separated from the ring bus. 2. The power supply for the motors is also laid as a ring bus line and is also monitored via the intelligent modules mentioned under point 1 and disconnected if necessary. 3. The intelligent modules mentioned under point 1 consist of two parts: a) Base plate with all necessary terminals for the ring bus cable (control cable), supply cable for the motors and motor connections. b) Circuit board with the electronics and intelligence. These two parts are connected to form a module via a plug connection. 4. All functions that cause the modules to carry out various switching or safety functions (switching off the bus line, switching off the supply lines) can be switched "on or off" from the control center.