【 Weak current College 】 automatic fire alarm system linkage control of device settings

"Automatic-manual" switch is in the field of automatic control for easy debugging and maintenance of a switch, manual transmission is issued through the button switches to start-up and shutdown or guidance signals; automatic stalls used to process automatic control that limit switch, cam hit block mechanical switch time relays, strain and electrical appliances, electrical appliances, and other actions to count towards process automatically. In a variety of automatic control system, because the control process is longer, program complex, requiring control stability, there is no interference, so you need to manually switch separates, prevent mistakes caused by automatic control program error. The establishment of the "auto-manual" switch, enabling two way power supply separate from each other and control, operational control of noninterference, automatic control system.

An increasing number of electric equipment in modern fire facilities in use, such as: fire pumps, fire sprinkler system pumps, foam extinguishing systems foam pump. Requirements under fire, the fire pump start-up and shutdown control should have automatic control and manual control function, and both start control devices should be ready for use, mutually independent, and not mutually exclusive. The automatic fire alarm system design code stipulates: "the automatic fire alarm system should be both automatic and manual trigger. "Whether it is a variety of automatic fire detectors and alarm signal or manual fire alarm button alarm signals at the same time can trigger an automatic fire alarm system gives a fire alarm signal and various linkage function, automatic start various fire extinguishing system.

However, detection of fire facilities, whenever the test in the automatic fire alarm systems and automatic sprinkler system linkage function, we encountered this situation many times: excludes all other possible failure, in simulated fire test, since the Jet pump failed to start automatically. The inspection, the reason is that since the Jet pump electrical control cabinet of switch at this point is the location of the "manual". On-site treatment method is very simple, as long as the switch to "automatic" position can be realized automatically turn on motor. But if it really happened, fire sprinkler system and normal supply cannot be automatically when tank fire extinguishing fire with water after use, that is no longer a fire effect. Such consequences could be disastrous.

Therefore, the "auto-manual" switch that will become the firefighting and rescue of major obstacles, we can not pretend envisaged? pump electric fire facilities, although many varieties, but the control requirements are not complicated and, basically, is to start, stop, no process control. Practice only one kind of situation needs to be "manually", that is, in the event of fire, and automatic fire alarm system and linkage control device malfunction due to other reasons, does not automatically start the appropriate pump, fire-fighting personnel at the scene to manually start the pump.

Accordingly, for the fire pump electrical control cabinet of "automatic-manual" switch in addition to increasing the "fault", become a potential fire-fighting, no benefits, can eliminate. Recommended pump manufacturers redesign electrical line, changes the electrical control of the control function, control of the fire pump in the "auto-manual" switch, so that the pump motor is ready you can also receive the "automatic" directive and the directives of the "manual", to better meet the requirements of the fire-fighting.