Liquid-free anti-spin protection device for pumps – Liquid-free anti-spin protection device for pumps, underload protection device for pumps, Underload protection device-
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Liquid-free anti-spin protection devices for pumps – 1. Overview of liquid-free anti-spin protection devices for pumps: These devices are intelligent solutions designed to prevent pump spin without liquid, and they represent an upgrade over traditional thermal relays. The liquid-free anti-stall protector for pumps utilizes digital processing technology and a high-brightness LED display. It detects the three-phase load current of the motor through a built-in current transformer, and can display the three-phase currents; based on these values, it can determine whether there are faults such as overload, underload, missing phase, or imbalance in the three-phase currents. When the above fault occurs, the relay contacts inside the liquid-free anti-idling protector of the pump disconnect, cutting off the power supply to the motor. II. Main functions of the liquid-free anti-spin protection device for pumps. JFY-8 series liquid-free anti-spin protection devices for pumps. I. Overview of the liquid-free anti-spin protection device for pumps. This device is an intelligent type of protection mechanism against spin without liquid, and it represents an upgrade over traditional thermal relays. The liquid-free anti-stall protector for pumps utilizes digital processing technology and a high-brightness LED display. It detects the three-phase load current of the motor through a built-in current transformer, and can display the three-phase currents; based on these values, it can determine whether there are faults such as overload, underload, missing phase, or imbalance in the three-phase currents. When the above fault occurs, the relay contacts inside the liquid-free anti-idling protector of the pump disconnect, cutting off the power supply to the motor. II. Main functions of the liquid-free anti-spin protection device for pumps:– Current display
– Overload protection
– Underload protection
– Phase loss protection
– Three-phase imbalance protection
– Automatic recovery
– Fault current locking
– Built-in time relay function
III. Main technical specifications of the liquid-free anti-spin protection device for pumps:
| Specification | Model | Unit |
|-------------|-------|------|
| Rated current setting range | JFY-801 | 1–100 |
| | JFY-802 | 1–30 |
| | JFY-808 | 3–90 |
| | JFY-811 | 1–1000 |
| | JFY-813 | 0.2–10 A |
| Current measurement range | | 150, 150, 450, 1000, 15 A |
| Current measurement accuracy | | ±1% |
| Power supply voltage | | AC 220 V |
| Contact capacity | | 3A/440VAC (pure resistive load) |
IV. Operation guide for the liquid-free anti-spin protection device for pumps:
– View the currents of phases A, B, and C. Under normal operation, the average current of the three phases is displayed; pressing the “Sel” button allows switching between the display of currents for phases A, B, and C. When faults such as overload, underload, phase loss, or three-phase imbalance occur, the current value flashes, indicating that it is the current at the moment the fault occurred (at that time the motor is powered off and the actual current is 0). l Setting of the motor’s rated current value (set current): Hold down the “Sel” key for 2 seconds; the word “Set” will appear. Use the “5” or “6” keys to change the set value (holding down “5” or “6” allows consecutive inputs). Once the setting is completed, press the “Sel” key to exit the setting mode. The alarm (protection) status is restored. When alarms such as overload, underload, phase loss, or three-phase imbalance occur, words like “Overload”, “Underload”, “Phase Loss”, “Imbalance” will flash on the display screen; the relay will disconnect and remain in that disconnected state. At this point, simply pressing the “5” or “6” key will restore it from the protection lock state. For parameter setting, while the current value is being displayed, hold down the “5” key for 5 seconds to enter the parameter setting mode. At this point, “Fxx” will be displayed on the monitor, where xx are two digits representing the parameter code. Use the “5” or “6” keys to select the parameter code; pressing the “Sel” key will display the parameter value corresponding to that code. At this point, use the “5” or “6” keys again to set the parameter value. After setting it, press the “Sel” key to return to the display of the parameter code.