Over/under Voltage Protector Setup Faqs: How To Enter The Menu, Adjust Thresholds, And Save?

Common Questions About Setting an Over/Under-Voltage Protector: How Do You Enter the Menu, Adjust Thresholds, and Save?

Many people have seen an over/under-Voltage Protector in a distribution box: it's a small DIN-rail device, yet it can automatically cut power when voltage is too high or too low, protecting appliances such as air conditioners and refrigerators from being burned out. But once protection parameters need to be changed, people often get stuck on a few questions: How do I enter the menu? What should the over-voltage value be set to? How do I save after adjusting?

This article explains the most common questions about setting an over/under-Voltage Protector in plain, easy-to-understand language. It should be noted that the operating logic differs between brands and models. This article uses the JGIV-63S series intelligent current-limiting over/under-Voltage Protector from Wenzhou Jiangguang Electric Technology Co., Ltd. as a typical example for explanation. For specific settings, please refer to the manual of the product you have on hand.

1. How Do You Enter the Settings Menu?

Over/under-Voltage Protectors usually do not have a complex screen; instead, all operations are completed with a "Setting key + Up key + Down key + Reset key." Taking the JGIV-63S as an example:

So "entering the menu" is actually very simple: press and hold the Setting key for 2 seconds. If the screen starts flashing or shows the current setting value, that means you have entered the menu. If the key does not respond, first confirm whether the product is powered on, then check the manual to confirm the specific key names.

2. How Do You Adjust the Over-Voltage/Under-Voltage/Over-Current Thresholds?

After entering the settings menu, you usually adjust items one by one in a fixed order. The order for the JGIV-63S is roughly as follows:

1. Over-voltage protection value: Default AC 270V, settable range 220V–300V.
2. Under-voltage protection value: Default AC 170V, settable range 140V–200V.
3. Over/under-voltage action delay: Default 1 second, settable range 1–120 seconds.
4. Rated current value: The default value varies by specification (40A or 63A; 80A is customized). The settable range must be confirmed in conjunction with the product specification.
5. Over-current protection time: Default 20 seconds, settable range 1–120 seconds.
6. Auto-reset time after fault: Default 20 seconds, settable range 1–120 seconds.

The adjustment method is very simple: in the corresponding menu, press the "Up key" to increase and the "Down key" to decrease. After adjusting each item, press the "Setting key" once to save the current item and move on to the next one.

Special note: The rated current specification of an over/under-Voltage Protector is very important. For example, the JGIV-63S comes in 40A, 63A, and other specifications, with 80A being customized. When setting the rated current, you cannot simply enter any value; it must be set in accordance with the actual load capacity of the circuit and the product's permissible specification range, otherwise it may cause nuisance tripping or loss of protection.

3. How Do You Save and Exit?

After adjusting all parameters, press the "Reset key" in setting mode to save and exit setting mode. The product will return to the normal voltage/current display screen.

If you do not want to save the current changes, you can simply cut the power, or exit in the manner indicated in the manual. Note that different products define "save" differently: some products "automatically save each item as it is adjusted," while others require a final unified save. The JGIV-63S saves and exits in a unified way by pressing the Reset key after all settings are completed.

4. Several Common Questions About Settings

1. If I forget to save and cut the power directly after setting, will the parameters be retained?

It depends on the product design. For products like the JGIV-63S, the settings are saved only when the Reset key is pressed in setting mode. If the power is cut before saving, the changes will most likely be lost. It is advisable to develop the habit of always pressing the Reset key to save after adjusting parameters, and then cutting the power.

2. If the over-voltage protection value is set to 270V, does that mean it will trip immediately once the mains reaches 270V?

No. The over-voltage protection value of 270V is only the trigger threshold; the actual action also depends on the "over/under-voltage action delay." The JGIV-63S has a default delay of 1 second, meaning it will trip only after the voltage exceeds 270V and remains so for 1 second. Short-term surges generally will not cause nuisance tripping.

3. After the first power-on or after a fault, how long until it automatically recloses?

The JGIV-63S automatically recloses 1 second after the first normal power-on; after a fault occurs, if the fault has been cleared, the product will automatically reclose after the set auto-reset time (default 20 seconds). One thing to note: when an over-current fault occurs, the first over-current will auto-reset, but a second over-current requires a manual press of the Reset key or cutting and restoring power before it can reclose.

5. Safety Reminders During Setup

• Cut the power before wiring: Before any setting or wiring operation, be sure to disconnect the upstream circuit breaker to avoid electric shock.
• The N line and L line must not be reversed: On the JGIV-63S, N is the neutral line and L is the live line; reversing them will cause the product to malfunction.
• Tighten the wiring screws: Poor contact may burn out the terminals.
• The installation environment has requirements: Generally, it must be used in locations free of explosion hazards, corrosive gases, and conductive dust.
• The manual prevails: The parameters in this article come from the JGIV-63S manual example. The key logic, menu order, and setting ranges of other models may differ.

6. Sources

• JGIV-63S Series Smart Current-Limiting Overvoltage and Undervoltage Protector User Manual, Wenzhou Jiangguang Electric Technology Co., Ltd.
  Smart Current-Limiting Overvoltage and Undervoltage Protector Product Information, ELEJG Product Center, https://elejg.com/voltage-protector/
  For questions regarding the overvoltage and underVoltage Protector, please contact the manufacturer or distributor for confirmation. Specific model parameters are subject to the actual product manual