Fire pump and spray pump requires a preparation, 2 sets of the same pump requires mutual investment, when the main pump failure of backup pump automatically put into use. 1: so what is the throwing device: 2: where is the device installed? It should be in the water pump control box. 3: what is the principle of mutual voting? Detailed description
You can refer to the DCL and DCS microcomputer access control system, you can achieve the purpose of remote control. Specific installation methods can be found in local instrument engineering inquiries.
Now fire control cabinet has several requirements, multi-channel start, failure switch, automatic inspection, etc.Failure switching is when the main pump fails to start, the standby pump is put into operation automatically (and the two pumps are alternate).Mutual investment due to the original selection of different electrical principle is slightly different, but the same is the control of the main contactor, the main contactor when the main pump without electricity and suction time, time relay (or PLC fault detection delay is given by the pump start signal delay conversion) pump operation.You'd better find a fire drawing study.
The main purpose of the control is to make sure that the pump outlet has a nominal pressure.Control requirement: 1. Start single pump manually.2, two pumps should alternate.3, the pump exports to achieve certain pressure, the normal operation of the motor, and the pressure is too low, the operation is meaningless.Device: AC contactor, intermediate relay, etc..Principle: 1, detect a pump fault (usually take the motor main contactor, auxiliary contact), interlock another pump to start.2, pump outlet pressure detection device detects low pressure, can start another pump at the same time, to ensure the normal export pressure!
