Where is the starting line of the fire hydrant in the fire fighting module?
Two on line and pump line to the fire control terminal cabinet on the simple point about pump line is a pair of fire control cabinet, the start button parallel line running lamp is lighting control cabinet at the start of the loop, the normally open
The other two lines are called feedback line, is to use water pump started after the scene all the fire hydrant button a feedback signal, when you see the fire hydrant button on the light that the feedback signal has already arrived, is actually the control cabinet given pump starts a 24V DC power supply signal, the signal power supply let the fire hydrant button on the lamp can light up, if the water pump control cabinet can give a DC 24V signal, you should use the relay on it
To tell you that it is from the pump principle, line connected to the fire pump to start the pump with the control cabinet, the middle relay is used for fire control of 24V DC power supply, fire control AC 220V switch cabinet to start the pump, you said the other end of the relay is connected to the terminals of the fire pump the control cabinet (specific consultation terminal water pump control cabinet manufacturers).
