FAQs

Our proprietary features include:

1. Password-protected PLL technology
2. Proportional control functionality
3. Built-in emergency horn
4. LED indicator circuit (PLL)
5. Operation indicator lamp
6. Multi-step, inching, acceleration, and toggle features
7. Twin mode and cloning capabilities
8. TEST/RUN function (PLL)
9. Synchronization of ID codes, frequencies, and functions
10. Computer-based system management for next-gen control

On JREMO receivers, terminals 3 and 4 are reserved for the emergency circuit. This circuit is critical in applications like cranes, where it controls the main magnet. If the relay malfunctions and the main circuit isn’t cut despite a stop command, serious accidents could occur. The emergency circuit ensures the main magnet can still be shut off directly from the receiver.

The emergency circuit includes a dedicated fuse and relay for external fail-safe protection. For general remote devices (non-crane use), this circuit is not essential for operation.

All JEICO products include an external operation lamp linked to the emergency circuit, providing visual confirmation of remote readiness—one of our features that sets us apart.

Note: Terminals 3 and 4 must be of the same phase and voltage (same C-phase line).

Yes, it is possible.

The JREMO 14K has a very special hidden feature called the Synchro Function.

When both the Up and Down buttons or the East and West buttons are pressed simultaneously, an interlock is activated, and an additional independent relay contact is added.

By assigning two hidden additional buttons using this synchro function, you can combine them with the existing 14 buttons to achieve a total of 16 functions.

Typically, the synchro function is very useful when there are not enough buttons, especially for lights or alarms.

Among JEICO products, the JREMO series remote hand controllers feature a very special function called Group Toggle Interlock.

In monorail setups, usually only 4 points are needed, so the remaining buttons can be grouped. These groups are mutually interlocked and granted toggle functions, allowing up to six hoists to be operated individually with a single remote control.

This is especially useful in line work where sequential operations are necessary. One person can handle six different tasks on the line — a truly revolutionary feature.

Yes, it’s possible and often necessary.

In devices like trolleys or winches that need long-distance or prolonged forward (FWD) and reverse (REV) movement, if you switch directly from forward to reverse without stopping, it can stress the equipment and be very dangerous.

To prevent this, the system must stop first before allowing the reverse direction. This is achieved by setting the reverse button to act as a stop button when the system is in forward motion — only after stopping can the reverse button be pressed again to resume operation.

JEICO JREMO models support two methods that meet this requirement:

Method 1: When forward (FWD) is ON, pressing FWD again or pressing REV will turn it OFF. Then, pressing FWD or REV again will turn it ON.

This is a toggle-type control where any press during ON state turns it OFF, and pressing again from OFF turns it ON. This method may or may not require a separate stop button, making it cost-effective.

Method 2: When FWD is ON, pressing FWD again keeps it ON. Pressing REV turns it OFF, and only after that, pressing FWD or REV again turns it ON.

This method ensures that only the opposite button turns OFF the current state. It can be done with just two buttons without a dedicated stop button, but for increased safety, a separate stop button is recommended.

This function is very useful for equipment like magnet cranes.

For example, if a magnet is ON and carrying a heavy object, an operator may accidentally or carelessly press the OFF button — the magnet would deactivate instantly, dropping the load. If there’s someone or something under the load, it can result in a catastrophic accident.

The Delay Off function prevents this by requiring a deliberate press-and-hold action to turn OFF the system.

Additionally, the system must support the Bypass EMS function so that dropping the remote or accidentally pressing the emergency button doesn’t trigger an OFF state.

In JEICO’s JREMO products:

This feature is a paid option for 6-point models,

But a free option for models with 8 or more points (and since most use 8+, it’s practically always free).

If you want to use just one button for both ON and Delay OFF, that’s a paid option.

You can set the delay time from 0 to 4 seconds, with 1 second as the factory default.

For instance, with a 1-second setting, the OFF button must be pressed for at least 1 second for it to deactivate.

This delay time can also be configured on-site.

Bypass EMS stands for Bypass Emergency Stop, which, as the name implies, means bypassing the emergency stop circuit. In other words, the emergency circuit does not activate. At first glance, this might seem unnecessary.

However, for lighting systems or magnet cranes, this function becomes absolutely essential.

For lighting: During nighttime operations, if the crane needs to be stopped or the battery changed, and the lights also turn off, it can cause significant difficulty — especially when lighting is solely provided by the crane.

For magnet cranes: If the emergency stop is pressed unintentionally, or if the remote battery needs to be replaced while lifting a heavy object, or the remote is dropped and EMS is triggered — the magnet should never turn OFF in such situations.

The system must allow the magnet or lights to remain ON regardless of the EMS state. This is the role of the Bypass EMS feature.

All JEICO JREMO products include this as a free option.

There are two main frequency generation methods for industrial wireless remote controls:

PLL (Phase Locked Loop): This type holds multiple assigned frequencies.

CRYSTAL: A 1:1 frequency method that holds only one fixed frequency.

Our products — JREMO series and Remote Hand F25 series — use the PLL method with multiple assigned frequencies.

Other models, such as F21-2S, F21-6C, F24-810, F24-60, which have been converted from domestic to overseas use, utilize the CRYSTAL method.

PLL allows frequency changes without hardware replacement, but because it uses a narrow bandwidth, it requires robust correction and stability design to prevent data loss or drift from external factors (like temperature, vibration, or electromagnetic interference). This is where product know-how becomes important.

CRYSTAL models, using only one frequency in a wide bandwidth, respond quickly and don’t need extra stability design — making them more economical. However, changing frequencies requires a physical component replacement.

The JREMO series, designed with the latest technology and accumulated expertise, ensures excellent response, stability, and reliability even within narrow bandwidths — a standout feature compared to competitors.

Compliance with industrial safety laws:

Remote controls for hoists must have a red emergency stop button and a safety key.

The real issue lies in how these are implemented.

For instance, the emergency stop button must be positioned on the front of the device so that if the remote is dropped, it hits the emergency button first — preventing accidental operations.

If the emergency button is placed on the top or bottom, or surrounded by a casing, it’s harder to press quickly in a real emergency. Worse, if the device is dropped, other buttons might get pressed instead, which can be extremely dangerous.

JEICO products are structurally designed from the beginning to ensure the emergency button is always more accessible than any other button, thus enhancing safety — going beyond simply meeting regulations.

This is a unique strength of JEICO, and it’s something that could benefit the whole industry if adopted more widely.

Safety key system:

Different companies use different approaches. JEICO uses both physical and electronic key methods:

For standard 6-button models, the electronic key is standard, with the physical key as an option.

For 8-button or more models, the physical key is standard, and the electronic key is optional.

Additionally, a password input option can be added, so unauthorized users cannot operate the remote — even accidentally.

All settings can be easily adjusted by the operator without any tools, ensuring both security and convenience.

Our standard range is approximately 100 meters for safe visibility to the naked eye. Customized shorter or longer distances are available upon request.

Yes. We offer a one-year (12-month) warranty from the date of shipment. This covers software issues only; damages caused by user negligence (e.g., water intrusion, drops, physical damage) are not included.

Our products hold KC, KCS, ISO 9001, and ISO 14001 certifications in Korea, as well as CE (Europe), TELEC (Japan), and FCC (USA) for export compliance.

Yes. We offer full customization—from basic functions to advanced firmware features, and even entirely new designs. Please share your specifications with us.

– Domestic (Korea) use:

173 MHz, 424 MHz, 447 MHz

– International export use:   

433 MHz (based on CE regulations – Europe)   

429 MHz (based on TELEC – Japan)

Made in Korea.

Not at all. Installation is straightforward—just refer to the circuit diagram included with the product.

Yes. Each relay contact cable comes out individually from the receiver, so you only need to connect them to the appropriate terminals. We usually provide a circuit diagram for reference, so installation should be straightforward. If you still find it difficult, please contact us for support.

These buttons enable remote control of speed-adjustment functions for equipment like cranes. Unlike single-action buttons, they allow for two-step activation. “Creep” usually refers to two-step buttons for up/down movement, while “dual-speed” refers to 4- or 6-button configurations that allow for multi-speed operation.

The 4L model is typically designed for ladder trucks. It includes a proportional volume control, allowing for fine-tuned output using volume knobs. For general crane or equipment use, we recommend the 6K model.

It’s an additional A-type relay contact. You can consider it an extra or spare button.

The 4L model is typically designed for ladder trucks. It includes a proportional volume control, allowing for fine-tuned output using volume knobs. For general crane or equipment use, we recommend the 6K model.

In a factory setting, the signal can be used safely and reliably up to 60–70 meters without loss.