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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 fans, pumps, and mechanical systems. It offers more than standard inverter functions, including variable frequency pump cycle control and fixed timing rotation modes. This makes it ideal for water supply and circulation systems where precise pressure management is required.
The inverter is equipped with a PI regulator, allowing for accurate control of motor speed based on feedback signals. It has two sensor input terminals: VPF for voltage signals and IPF for current signals. Additionally, it includes FA (fire operation signal), LA1 (low water level), and LA2 (high water level) terminals, as well as upper and lower alarm output terminals 30PA, 30PB, and 30PC. These features help monitor and protect the system from abnormal conditions.
One unique feature of the BT12S series is the sleep and wake value settings (parameters F66 and F67). When multiple pumps are involved in a water supply system, these values can be adjusted according to user requirements. If the pressure drops below the sleep value, the pump starts; if it's below the wake value, the main pump engages. 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 go into sleep mode to save energy.
The BT12S series can also function as a general-purpose frequency converter, making it versatile for various applications.
(2) SB60P and SB61P Series Inverter
The SB60P and SB61P series inverters share a similar circuit design but differ in capacity range. Both use a digital signal processor (DSP) for vector control, offering improved performance and efficiency. They also include a PID regulator and support multi-pump cycle operations through an external expansion board. This makes them suitable for complex pumping systems that require coordinated control.
2. Fan Pump Frequency Control Program
There are several control methods available for fan pumps, and the choice depends on the specific application. Below are some commonly used programs:
(1) Manual Adjustment
This is one of the simplest control methods, where an operator manually adjusts the inverter frequency to change air volume or flow rate based on production needs. It is compatible with any type of inverter and is often used during the retrofitting of older equipment.
The FWD terminal is used for forward signal input, while CM is the common terminal. SB is a switch used to start or stop the motor. When SB is closed, the motor runs forward; when open, it stops. To retain the original starting device, the damper and valve are kept fully open, and KM1 and KM3 are connected. The inverter is used for driving the motor. If the inverter fails or requires maintenance, KM3 is disconnected, and KM2 is activated to return to the original equipment setup. To ensure safety, KM2 and KM3 are interlocked both electrically and mechanically.
(2) Dual-Frequency Control Inverter
This method is simple, reliable, and easy to implement, providing sufficient accuracy for many less demanding applications. It uses two terminals, X4 and X5, which are set up according to the inverter manual. These terminals control the inverter’s speed and deceleration. SP is connected to an electrical contact pressure gauge, with SP1 and SP2 representing the lower and upper limit contacts. The state of X4 and X5 directly controls the inverter output frequency (fx). When X4 is connected to CM, fx increases until it is disconnected. Similarly, when X5 is connected to CM, fx decreases until it is released.
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