Star delta one in use and one standby startup control diagram
This drawing is applicable to the start-up of spray pump (under patrol inspection), one for use and one for standby; The start and stop signals of fire control, fire hard wire and manual hard wire are DC24V active self holding signals; Manual operation: the two pumps work independently, accept the control of the cabinet door button, start and stop respectively or at the same time; Automatic: when the pump is overloaded or fails to trip, it will alarm and put the standby pump into operation. When the standby pump is overloaded, it will alarm and continue to work. When the pump is repaired, it will automatically switch back to the service pump. The content is detailed and can be used for reference.
