The Senlan BT12S series inverter is specifically designed for applications involving fans, pumps, and mechanical systems. It offers advanced control features beyond standard inverters, including variable frequency pump cycle and fixed timing rotation functions—both of which can be enabled by adding a relay extension board (as detailed in the user manual). This makes it ideal for water supply systems where precise pressure control is required.
Equipped with a PI regulator, the BT12S series supports multiple feedback signals, such as VPF (voltage signal) and IPF (current signal), along with FA (fire operation signal), LA1 (low water level), and LA2 (high water level). It also includes alarm output terminals (30PA, 30PB, 30PC) for system monitoring and safety.
One of the standout features of the BT12S series is its unique sleep and wake value settings (parameters F66 and F67). These values allow the inverter to manage multiple pumps efficiently. When the pressure drops below the sleep value, the pump starts. If the pressure falls further below the wake-up value, the main pump engages. Conversely, when pressure exceeds the wake-up value, the main pump stops, and a smaller pump takes over. If the pressure rises above the sleep value, all pumps go into standby mode, conserving energy.
In addition to its specialized functions, the BT12S series can also function as a general-purpose inverter, offering flexibility for various applications.
The SB60P and SB61P series inverters share a similar circuit design but differ in their power capacity. Both are based on digital signal processing (DSP) and use vector control technology, delivering superior performance. They also feature a PID regulator and support multi-pump cycle control through an external expansion board, making them suitable for more complex system configurations.
For fan and pump applications, there are several control methods available depending on the specific needs. Here are some common approaches:
1. **Manual Adjustment**
This method involves direct operator input, where the frequency of the inverter is adjusted manually to control air volume or flow. It’s commonly used in retrofitting older equipment and works with any type of inverter. The FWD terminal is used for forward signal input, while CM serves as the common terminal. A changeover switch (SB) controls motor start/stop. When SB is closed, the motor runs in the forward direction; when open, it stops. To maintain the original system, the baffle and valve remain fully open, and the inverter drives the motor. In case of inverter failure or maintenance, KM3 is disconnected, and KM2 is activated to revert to the original starting device and valve control. Electrical and mechanical interlocks are in place between KM2 and KM3 to ensure safety.
2. **Dual-Frequency Control Inverter**
This approach is simple, reliable, and easy to implement. It meets basic accuracy requirements and is widely used in less demanding applications. Two terminals, X4 and X5, are used to control the inverter’s speed and deceleration. SP1 and SP2 are pressure switches that monitor lower and upper pressure limits, respectively. The inverter’s output frequency (fx) increases when X4 is connected to CM and decreases when X5 is connected. This allows direct control of the inverter based on pressure conditions, ensuring efficient operation.
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