The Senlan BT12S series inverter is specifically designed for applications involving fans, pumps, and mechanical systems. It offers advanced digital control features beyond standard inverters, including variable frequency pump cycle and fixed timing rotation modes. These functions can be expanded by adding a relay extension board, as detailed in the user manual. The inverter includes a built-in PI regulator and multiple signal input terminals, such as VPF (voltage feedback), IPF (current feedback), FA (fire operation signal), LA2 (high water level signal), and LA1 (low water level signal). It also has upper and lower alarm output terminals: 30PA, 30PB, and 30PC.
One of the unique features of the BT12S series is its sleep and wake value settings (parameters F66 and F67). This allows the system to automatically manage multiple pumps based on pressure levels. When the pressure drops below the sleep value, the pump starts; if it falls below the wake value, the main pump activates. Conversely, when pressure exceeds the wake value, the main pump stops, and a smaller pump takes over. If the pressure is above the sleep value, all pumps enter a sleep mode, conserving energy and reducing wear.
In addition to its specialized pump control capabilities, the BT12S series can also function as a general-purpose inverter. For more complex multi-pump applications, the SB60P and SB61P series offer similar circuit structures but with different capacity ranges. Both models use a digital signal processor (DSP) for vector control, providing enhanced performance. They also include a PID regulator and support for external expansion boards to manage multi-pump cycles effectively.
For fan and pump control, several methods are available depending on the application requirements. One common approach is manual adjustment, where an operator controls the inverter’s frequency using a switch or control panel to adjust airflow or flow rate. This method is simple and suitable for retrofitting older equipment. The FWD terminal provides forward signal input, while CM serves as a common terminal. The SB terminal acts as a changeover switch. When SB is closed, the motor runs forward; when open, it stops. To maintain compatibility with existing systems, the original starter and damper may remain active, with KM1 and KM3 connected. In case of inverter failure, KM3 can be disconnected, and KM2 activated to use the original device.
Another method is dual-frequency control, which is straightforward and reliable, often used in less demanding applications. Terminals X4 and X5 are used to control the inverter’s speed, with SP being an electrical contact pressure gauge. SP1 and SP2 represent the lower and upper limit contacts. By connecting X4 or X5 to CM, the inverter adjusts its output frequency accordingly, allowing for precise pressure control.
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