VIOX FCT18-Q Single Function Time Relay

Introduction

The FCT18-Q is a high-precision, industrial-grade single function time relay designed for applications requiring reliable OFF-delay timing functionality. With its versatile time range settings, wide power supply compatibility, and robust construction, the FCT18-Q offers exceptional performance for automation systems, industrial control panels, and machinery that requires precise timing control.

This DIN rail-mountable relay features triple OFF-delay functionality with rising edge triggering, making it ideal for sequencing operations, machine shutdown procedures, cooling cycles, and other critical timing applications where signal continuity and precision are essential.

Key Features and Benefits

• Wide Time Range: Adjustable from 0.1 seconds to 100 days, providing flexibility for virtually any industrial timing application
• Universal Power Supply: Compatible with 12 to 240 VAC/DC power sources, eliminating the need for multiple relay variants
• High Precision: Time error less than 0.5% and time deviation of only 0.1%, ensuring reliable and consistent operation
• User-Friendly Design: Easy setup with clear wiring diagrams printed directly on the product housing
• Strong Anti-Interference Capability: Engineered to maintain stable performance in electrically noisy environments
• Dual Control Signal Options: Available in both NPN and PNP configurations to match your control system requirements
• Indicator LEDs: Green LED for power status and red LED for relay activation for clear visual monitoring
• Compact Dimensions: Space-saving 90mm × 18mm × 64mm design for efficient panel utilization
• Industrial-Grade Durability: Operating temperature range of -20°C to +85°C with IP20 protection rating

Understanding OFF-Delay Function

The FCT18-Q operates with triple OFF-delay (rising edge triggering) functionality. During the delay processing period, the signal will be considered invalid. Here’s how it works:

1. When the input signal (Un) is applied, the relay output (R) remains active
2. The timing function is triggered by the rising edge of the input signal (S)
3. When the input signal is removed, the relay maintains its state for the preset time period (T1+T2)
4. After the delay period expires, the relay returns to its original state

This timing function is particularly useful for applications where equipment needs to continue operating for a specific period after the trigger signal has been removed, such as fans continuing to run after a machine is powered off to allow for cooling.

Time Setting Options

The FCT18-Q provides an exceptionally broad range of time settings through its intuitive dial selector system. The available time ranges include:

• 0.1-1 second
• 1-10 seconds
• 0.1-1 minute
• 1-10 minutes
• 0.1-1 hour
• 1-10 hours
• 0.1-1 day
• 1-10 days
• 3-30 days
• 10-100 days

Each range is easily selected using the clearly marked rotary dials on the front of the unit, allowing for precise control over your timing requirements from sub-second intervals to multi-month durations.

Ratio Setting Flexibility

The FCT18-Q features fine-tuning capabilities with its ratio setting dial, allowing you to select the exact percentage of the maximum time range. The available ratio settings include:

This precision adjustment allows you to dial in exactly the timing requirements your application demands without compromising accuracy.

Wiring Options

The FCT18-Q supports both NPN and PNP control signal configurations, making it compatible with a wide range of industrial control systems:

NPN Configuration

• Un: Power supply input
• S: Control signal input
• OA1: Output (DC+ / AC L)
• OA2: Output (DC- / AC N)
• Terminals: 11, 12, 14, 21, 22, 24 for relay contacts

PNP Configuration

• Un: Power supply input
• S: Control signal input
• OA1: Output (DC+ / AC L)
• OA2: Output (DC- / AC N)
• Terminals: 11, 12, 14, 21, 22, 24 for relay contacts

Technical Specifications

Model Selection Guide

The FCT18-Q model designation system follows this format:

FCT18-Q 1 W N

Where:

1. Function (Position 1): Q – Triple OFF-delay
2. Type of Output (Position 2): 1 – 1CO contact / 2 – 2CO contacts
3. Supply Voltage (Position 3): A – AC230V / D – DC24V / W – AC/DC12-240V
4. Control Signal (Position 4): N – NPN / P – PNP

For example, FCT18-Q1WN indicates a single function time relay with triple OFF-delay function, 1CO contact output, AC/DC12-240V supply voltage, and NPN control signal.

Dimension

Applications

The FCT18-Q single function time relay is ideally suited for numerous industrial and automation applications:

• Manufacturing Equipment: Controlling sequential operations in assembly lines
• HVAC Systems: Fan overrun timing for ventilation systems
• Pump Control: Delayed shutdown of water circulation systems
• Industrial Processes: Timed operations in chemical dosing or material handling
• Lighting Control: Staircase timers and delayed-off lighting scenarios
• Security Systems: Delayed activation or deactivation sequences
• Agricultural Equipment: Irrigation system timing controls
• Energy Management: Peak load shedding with timed reconnection
• Machine Safety: Ensuring proper cooldown periods before maintenance
• Conveyor Systems: Coordinated product transport timing

Installation Guidelines

For optimal performance and reliability, we recommend following these installation guidelines:

1. Mount the FCT18-Q on a standard 35mm DIN rail in a vertical position
2. Ensure adequate ventilation around the device, especially in high-temperature environments
3. Maintain a minimum distance of 5mm between adjacent devices to prevent overheating
4. Use proper wire gauge (AWG13-20) and maintain the recommended stripping length of 7mm
5. Verify that the supply voltage matches the device rating before powering on
6. Follow the wiring diagram on the side of the product for proper connection
7. Select the appropriate time range and ratio setting before operation
8. Keep away from sources of strong electromagnetic interference
9. Install in environments with pollution level 2 or better
10. Do not exceed the maximum installed altitude of 2200m

Maintenance and Troubleshooting

The FCT18-Q is designed for minimal maintenance, but periodic checks are recommended:

• Verify that all connections remain tight and free from corrosion
• Check that the device is free from dust and debris that could affect cooling
• Confirm that the LED indicators function properly
• Test the timing function periodically to ensure continued accuracy
• Replace the unit if the mechanical or electrical life cycle limits are approached

Common troubleshooting steps:

1. No Power Indication: Check input power connections and voltage level
2. Erratic Timing: Verify that the environment is free from excessive electrical noise
3. Relay Not Activating: Check control signal connections and polarity
4. Inaccurate Timing: Confirm time range and ratio settings are properly configured
5. Overheating: Ensure adequate spacing and ventilation around the device

Advantages Over Competing Products

The FCT18-Q offers several distinct advantages over similar timing relays in the market:

• Broader Time Range: Many competing products offer only seconds to days, while the FCT18-Q spans from 0.1 seconds to 100 days
• Higher Precision: With time error less than 0.5% and deviation of only 0.1%, it outperforms industry standards
• Universal Voltage Input: The wide 12-240 VAC/DC compatibility eliminates the need for multiple models
• Superior Temperature Range: Operating capability from -20°C to +85°C exceeds many alternatives
• Better Anti-Interference: Engineered specifically for reliable operation in noisy industrial environments
• More Compact Design: The 90mm × 18mm × 64mm footprint saves valuable panel space
• Visual Indication: Dual LED indicators provide clear operational status monitoring
• Longer Lifespan: Mechanical life of 10 million operations and electrical life of 100,000 cycles

Conclusion

The FCT18-Q Single Function Time Relay represents an optimal solution for industrial timing applications requiring precision, reliability, and ease of use. With its wide time range settings, universal power supply compatibility, and robust construction, it delivers exceptional performance across numerous applications.

Whether you’re designing a new control system or upgrading existing equipment, the FCT18-Q offers the perfect combination of functionality, durability, and value. Its clear labeling, straightforward setup, and precise timing capabilities make it the ideal choice for engineers and technicians seeking dependable timing control.

For more information about the FCT18-Q or to discuss your specific application requirements, please contact our technical support team or visit our website at viox.com.