VIOX FCT18-BgF Interval Timer Relay with Control Signal Off

Introduction to the VIOX FCT18-BgF Interval Timer Relay

The VIOX FCT18-BgF is a high-precision interval timer relay designed for industrial automation systems where timing accuracy and reliability are critical requirements. This versatile timing device operates with a control signal off function (OFF-delay with falling edge triggering), making it an ideal choice for applications where process control requires precise timing intervals after a control signal is removed.

What is an Interval Timer Relay?

An interval timer relay is a specialized control device that manages timing functions in electrical circuits. Unlike standard relays that simply open or close circuits, timer relays introduce a timing element that allows for precise control over when electrical operations occur. The FCT18-BgF specifically utilizes an “OFF-delay” timing function, which means the relay remains energized for a predetermined time after the control signal is turned off, providing a controlled shutdown sequence in various applications.

Key Features of the FCT18-BgF Interval Timer Relay

Versatile Timing Functionality

The FCT18-BgF features an OFF-delay timing function with falling edge triggering. This means that the timing cycle begins when the control signal (S) is turned off, and the delay processing remains unaffected by subsequent changes to the S input during the timing cycle. This provides stable and predictable timing operations in complex industrial environments.

Exceptional Time Range Flexibility

One of the most impressive aspects of the FCT18-BgF is its extraordinarily wide time range capability:

• Ultra-short intervals from 0.1 seconds
• Extended periods up to 100 days

This remarkable range is organized into ten selectable time settings:

• 0.1-1s
• 1-10s
• 0.1-1m
• 1-10m
• 0.1-1hr
• 1-10hr
• 0.1-1day
• 1-10day
• 3-30day
• 10-100day

Precision Ratio Control

The FCT18-BgF offers granular control over timing through its ratio setting feature. The ratio can be adjusted from 10% to 100% of the selected time range in increments including:

10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, and 100%

This allows for precise customization of timing intervals to meet specific application requirements.

Universal Power Supply Compatibility

The FCT18-BgF is designed with flexibility in mind, featuring a wide power supply range from 12 to 240 VAC/DC. This universal compatibility eliminates the need for multiple relay variants and simplifies inventory management for maintenance teams.

Superior Timing Accuracy

With a time error of less than 0.5% and time deviation of just 0.1%, the FCT18-BgF delivers exceptional precision for critical timing applications. The relay also maintains a repeat accuracy of 0.5%, ensuring consistent performance across multiple operations.

Robust Environmental Performance

Engineered for industrial environments, the FCT18-BgF operates reliably across a wide temperature range from -20°C to +60°C (-40°F to +85°F). The temperature coefficient of 0.05%/°C at 20°C (0.05%/°F at 68°F) ensures timing stability even under variable ambient conditions.

Strong Anti-Interference Capability

Industrial environments often contain electrical noise and interference that can affect the performance of sensitive control equipment. The FCT18-BgF features strong anti-interference capabilities, ensuring reliable operation even in electrically noisy environments.

Technical Specifications

Available Models

The FCT18-BgF comes in two variants:

• FCT18-BgF1: Features 1 SPDT (Single Pole Double Throw) contact rated at 16A
• FCT18-BgF2: Features 2 SPDT contacts rated at 16A

Model Coding System

The FCT18-BgF follows a clear coding system for order specification:
FCT18-BgF 1 W N

Where:

1. Function: BgF (OFF-delay)
2. Type of output: 1 (1CO contact) or 2 (2CO contacts)
3. Supply voltage: A (AC230V), D (DC24V), or W (AC/DC12-240V)
4. Control signal: N (NPN) or P (PNP)

Electrical Specifications

Parameter	Specification
Input Terminal	A1-A2
Voltage range	AC 230V / DC24V / AC/DC 12-240V
Power consumption	AC 3.5VA/ DC 2.0W
Voltage tolerance	-15% ~ +10%
Supply indication	Green LED
Relay indication	Red LED
Time ranges	0.1s-100days
Time setting	Button
Time deviation	0.1%
Repeat accuracy	0.5%
Temperature coefficient	0.05%/°C, at 20°C (0.05%/°F, at 68°F)
Output contact	1*SPDT (FCT18-BgF1) or 2*SPDT (FCT18-BgF2)
Rated current	1*16A (FCT18-BgF1) or 2*16A (FCT18-BgF2)
Mechanical life	1*10⁷
Electrical life	1*10⁵

Physical Specifications

Parameter	Specification
Ambient Temperature	-20 … +60°C / -40 … +85°F
Mounting	DIN rail EN/IEC 60715
IP Rating	IP20
Stripping length	7mm (0.28in)
Installed altitude	≤2200m
Pollution level	2
Max cable size	AWG13-20 0.4N·m
Dimension	90mm*18mm*64mm
Weight	about 90g
Standards	GB/T 14048.5, IEC60947-5-1, EN6812-1

Wiring Options

The FCT18-BgF supports both NPN and PNP control signal configurations:

NPN Configuration

• A1 terminal: DC+/AC L
• S terminal: Control signal input
• A2 terminal: DC-/AC N

PNP Configuration

• A1 terminal: DC+/AC L
• S terminal: Control signal input
• A2 terminal: DC-/AC N

Timing Function Operation

The FCT18-BgF operates with an OFF-delay timing function:

1. When power (Un) is applied, the relay remains in standby mode
2. When the control signal (S) is activated, the relay (R) is immediately energized
3. When the control signal (S) is turned off (falling edge), the relay remains energized
4. The relay begins its programmed time delay (T)
5. Once the time delay expires, the relay is de-energized
6. The delay processing is not affected by changes to the S input during timing

This timing function is particularly useful in applications where a process needs to continue for a set period after a control signal is removed.

Dimension

Applications of the FCT18-BgF Interval Timer Relay

The versatile FCT18-BgF timer relay is suitable for a wide range of industrial and commercial applications:

Industrial Automation

• Conveyor belt control systems
• Machine tool operation sequencing
• Process control in manufacturing
• Industrial oven and furnace control
• Automated filling and packaging systems

HVAC Systems

• Fan control and ventilation timing
• Heating system cycling
• Cooling system management
• Air handling unit sequencing

Water Management

• Pump control and irrigation systems
• Water treatment process timing
• Filtration system control
• Level control applications

Lighting Control

• Commercial lighting sequences
• Security lighting systems
• Timed illumination control
• Energy-saving lighting applications

Security Systems

• Access control timing
• Alarm system integration
• Door lock control sequences
• Surveillance system integration

Installation and Setup

The FCT18-BgF is designed for easy installation and setup:

1. Mount the device on a standard DIN rail (EN/IEC 60715)
2. Connect power supply to terminals A1 and A2
3. Connect control signal to terminal S
4. Connect output contacts according to the application requirements
5. Set the desired time range using the time setting selector
6. Adjust the ratio setting to fine-tune the timing interval
7. Verify proper installation using the LED indicators (green for power, red for relay status)

Advantages of the VIOX FCT18-BgF Over Standard Timer Relays

Extended Time Range

While many timer relays offer limited timing ranges, the FCT18-BgF’s capability from 0.1 seconds to 100 days provides exceptional flexibility for virtually any timing application.

Universal Power Supply

The wide 12-240 VAC/DC operating range eliminates the need for multiple relay variants, simplifying inventory and increasing installation flexibility.

Superior Accuracy

With time error less than 0.5%, the FCT18-BgF provides precision timing for critical applications where accuracy is essential.

Anti-Interference Design

The strong anti-interference capability ensures reliable operation even in electrically noisy industrial environments.

Compact DIN Rail Design

At just 90mm×18mm×64mm, the FCT18-BgF offers space-saving installation while maintaining full functionality.

Clear Visual Indicators

The dual LED system provides instant status information, with green LED indicating power and red LED showing relay status.

Recommended Maintenance and Care

To ensure long-term reliability of the FCT18-BgF timer relay:

1. Install in a clean, dry environment within the specified temperature range
2. Ensure proper ventilation around the device
3. Periodically check electrical connections for tightness
4. Verify correct operation through routine functional testing
5. Keep the device free from dust and contaminants
6. Avoid installation near sources of extreme heat or electromagnetic interference
7. Follow specified installation procedures regarding mounting and wiring

Compliance and Certification

The FCT18-BgF conforms to international standards including:

• GB/T 14048.5
• IEC60947-5-1
• EN6812-1

These certifications ensure the device meets rigorous quality and safety standards for industrial control equipment.

Conclusion: Why Choose the VIOX FCT18-BgF Interval Timer Relay

The FCT18-BgF interval timer relay represents VIOX’s commitment to providing high-quality, reliable timing solutions for industrial applications. With its exceptional time range flexibility, superior accuracy, and robust design, this timer relay delivers consistent performance in demanding environments.

Key reasons to select the FCT18-BgF for your timing applications include:

• Extraordinary timing range from 0.1 seconds to 100 days
• Universal power supply compatibility (12-240 VAC/DC)
• High precision with time error less than 0.5%
• Strong anti-interference capability for reliable operation
• Easy setup with clear visual indicators
• Compact DIN rail mounting design
• Compliance with international standards

Whether for industrial automation, HVAC control, security systems, or any application requiring precise timing control, the VIOX FCT18-BgF provides a reliable, flexible solution that meets the demands of modern control systems.