Speaking of emergency lighting, do you really know the strong lighting principle?
Do not know the forced start principle of emergency lighting
How many wires should be used for emergency lighting
There's no way to talk about it
The following is some understanding of the principle of emergency lighting forced start
Let's have a look~
Classify emergency lighting first
A. According to different control modes, it can be divided into: no control, local control and centralized control;
B. According to the lighting time of lamps, they are divided into: normally on (such as evacuation direction indicator and emergency exit sign), and only on in case of fire or power failure (such as double-headed lamp);
C. According to different forced start modes, it can be divided into: forced start of fire control room signal, forced start of charging detection line with battery power supply after power loss;
D. Press "Self contained battery": Self contained battery, not self contained battery;
E. According to the number of light sources, the lamps can be divided into: emergency lamps with normal light source and emergency light source, and emergency lamps with only emergency light source.
Wiring of emergency lamps
An emergency lamp with only an emergency light source and its own battery, that is, only one light source. The maximum number of wires connected from emergency lamps is 4, one lighting line, one charging/detection line, one N line and one PE line
One end of the charging/detection line is connected to the mains, and the other end is connected to the self-contained battery of the emergency lamp. As the name implies, this thread has dual functions. This line is used to charge the self-contained battery of the emergency lighting fixture while the mains power remains energized. In the event of mains power loss, the zero voltage signal of the mains power is transmitted to the self-contained battery through a detection line, which supplies power to the emergency lighting fixture, thereby lighting the emergency lighting fixture and activating the emergency lighting fixture.
This is the forced start mode of the emergency lamp with its own battery power supply after the charging/detection line loses power. In order to ensure the charging of the self-contained battery of the emergency lamp, this line is generally connected, that is, in the state of power.
The function of the lighting line at ordinary times/forced lighting is that we can treat and use this emergency lamp as a common lamp under non-emergency conditions. In non-emergency state, the wire connected to the static contact 1 of the double-control switch S is in the energized state, and the wire connected to the static contact 2 of the double-control switch S is in the de-energized state. The dual-control switch S (this dual-control switch is actually a single-link single-control switch in non-emergency state) can realize the lighting and extinguishing of this emergency lamp. When the static contact 1 is hit, the emergency lamp will be on, and when the static contact 2 is hit, the emergency lamp will be off. In the case of emergency and mains power, the wires connected to the static contacts 1 and 2 of the double-control switch S are in the state of power. This wire will realize the forced start of the emergency lamps, which is the signal forced start mode of the fire control room.
The PE line is connected to the shell of the emergency lamp.
Needless to say, the function of the N line.
The so-called forced start refers to lighting the lamps in emergency state (lighting the lamps in non-emergency state is not called forced start). There are two types of forced start of emergency lamps:
A. If the charging detection line loses power, the self-contained battery will supply power to the emergency lamp;
The charging detection line is electrified, and the emergency lighting forced start line supplies power to the emergency lamps.
This is a typical double-headed lamp connection method. The characteristics of double-headed lamps are: they are not lit at ordinary times, and they are lit in case of power failure or fire.
Startup of emergency double-headed lamps in case of power failure. In case of power failure, the charging detection line loses power, the relay coil loses power, the magnetic flux is 0, the normally closed contact is closed, the battery and emergency lamp are connected, and the lamp is lit.
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