FBM215 P0917TQ Among the heating methods such as induction heating, infrared heating and resistance heating, for blade mould heating, resistance wire heating has the advantages of durable components, easy maintenance and replacement, simple operation and low cost. Resistance wire heating is the pre-buried heating resistance wire in the FRP layer of the mould, and the heating resistance wire is laid under the heating layer (resin + aluminium powder) of the mould [3]. Although the resistance wire heating method is more commonly used, with the growth of wind turbine capacity, the size of wind turbine blades increases, and the heating system of megawatt-class large wind turbine blade moulds has the characteristics of multiple and complex division areas.

FBM215 P0917TQ based on the resistance wire heating mode of the mould heating system appears to lack of reliability, the temperature is not easy to control, prone to the phenomenon of local temperature is too high, so for the blade forming mould temperature control system puts forward a higher process requirements. As a cpu unit, the module type plc has high reliability, strong anti-interference ability, and is suitable for multi-channel temperature control. cj1g series plc has a temperature control unit that supports 2-loop or 4-loop pid control or on/off control, of which the 2-loop mode has a heating circuit break detection function; at the same time, pid constants used for pid control can be set with self-adjustment (at).

FBM215 P0917TQ forward operation (cooling) or reverse operation (heating) is selectable; direct input from temperature sensor is possible; sampling period is 500ms; 2-point internal alarms for each circuit; for the 2-loop mode, a current transformer is connected to each circuit to detect heater breaks. As the blade forming mould is divided into multiple circuits for heating, so in a total controller for the coordination of the heating temperature of each circuit on the basis of each single-loop temperature collection and the respective area of the temperature field of the heating, thermostat to maintain and cool the work.