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1. Senlan Pump with Frequency Converter Performance Profile
(1) BT12S Series Inverter
The Senlan BT12S series frequency converter is specifically designed for applications involving fans, pumps, and mechanical systems. Beyond standard inverter functions, it offers two unique modes: variable frequency pump cycle and variable frequency pump fixed timing rotation. This makes it ideal for water supply systems where precise control is essential.
The inverter is equipped with a PI regulator, allowing for accurate control of pressure or flow. It features two sensor feedback signal input terminals—VPF (voltage signal) and IPF (current signal)—as well as a fire operation signal terminal FA, high water level signal terminal LA2, and low water level terminal LA1. Additionally, there are upper and lower alarm output terminals 30PA, 30PB, and 30PC for safety monitoring.
One of the standout features of the BT12S series is its sleep and wake value settings (parameters F66 and F67). These values help manage multiple pumps in a system efficiently. When the pressure falls below the sleep value, the pump starts; if the pressure drops further below the wake-up value, the main pump activates. Conversely, when the 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 sleep mode to conserve energy.
The BT12S series can also function as a general-purpose frequency converter, making it versatile for different applications.
(2) SB60P and SB61P Series Inverter
The SB60P and SB61P series share the same circuit structure but differ in their capacity range. Both use a digital signal processor (DSP) for vector control, offering improved performance and stability. These inverters also come with a PID regulator and support multi-pump cycle operations through an external expansion board.
2. Fan Pump Frequency Control Program
There are various control methods available for fan and pump systems, and the choice depends on the specific application. Below are some commonly used programs.
(1) Manual Adjustment
This is the simplest control method, where an operator manually adjusts the inverter frequency to regulate airflow or flow rate based on production needs. It is compatible with any type of frequency converter and is often used in upgrading old equipment.
The FWD terminal is the forward signal input, while CM serves as the common terminal. SB is a switch used to start or stop the motor. When SB is closed, the motor runs in the forward direction; when open, it stops. To retain the original starting device, the damper and valve are typically fully open, with KM1 and KM3 connected. The inverter drives the motor. If the inverter fails or requires maintenance, KM3 is disconnected, and KM2 is activated to use the original equipment’s starting mechanism along with the damper and valve. To ensure safety, KM2 and KM3 are interlocked both electrically and mechanically.
(2) Dual-Frequency Control Inverter
This method is straightforward, reliable, and easy to implement. While not the most precise, it meets basic requirements and is widely used in less demanding applications.
Terminals X4 and X5 are used to control the inverter speed and deceleration according to the manual. SP is an electrical contact pressure gauge with SP1 and SP2 representing the lower and upper limit contacts, respectively. The state of X4 and X5 directly controls the inverter's output frequency. When X4 is connected to CM, the inverter frequency increases and stops rising when disconnected. Similarly, when X5 is connected to CM, the frequency decreases and stops falling when disconnected.
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