FCT18-Xd Asymmetrical On/Off-Delay Relay
Dual Timing Control with Independent On/Off Delays
Product Overview
The FCT18-Xd is a versatile asymmetrical time relay with independent on-delay and off-delay timing functions. Engineered for complex industrial automation systems, it provides precise dual timing control with independent settings for on-delay (T1) and off-delay (T2) operations. With its compact 18mm DIN rail design and wide operating voltage range (12-240V AC/DC), the FCT18-Xd is the ideal solution for applications requiring sophisticated sequential timing control.
Key Technical Advantages
Universal Voltage Input
Operates with 12-240V AC/DC, compatible with global industrial power standards.
Dual Timing Control
Independent settings for on-delay (T1) and off-delay (T2) operations.
Ultra-Compact Design
Space-saving 18mm width (90×18×64mm) for high-density control panels.
Exceptional Accuracy
Repeat accuracy ∆< ±0.5% and Time setting accuracy ∆< ±0.1%.
Industrial Robustness
Designed for -20°C to +60°C environments with EMI resistance.
Flexible Triggering
Supports NPN or PNP input options for versatile integration.
High-Capacity Output
16A C/O contacts (1 or 2 sets) for industrial loads.
Extended Timing Range
Wide timing range from 0.1s to 100 days for diverse applications.
Industrial Application Scenarios
The FCT18-Xd asymmetrical relay excels in scenarios requiring precise sequential control with independent on/off timing. Below are key applications where its dual-timing functionality delivers superior performance:
Motor Control Systems
Sequential control of main motor and cooling fan with independent delays to prevent startup surges and manage post-operation cooling.
Key Benefits:
- Prevents electrical surge during startup
- Ensures adequate cooling after shutdown
- Extends motor lifespan
Conveyor Sequencing
Staggered startup and shutdown of conveyor sections to prevent material pileup and reduce mechanical stress.
Key Benefits:
- Prevents material backflow and jams
- Reduces mechanical wear during startup
- Optimizes energy consumption
Safety Interlock Systems
Delayed equipment activation after safety door closure and delayed shutdown after emergency stop activation.
Key Benefits:
- Ensures safe clearance times
- Prevents abrupt system shutdowns
- Complies with safety regulations
Pump Control Systems
Sequential startup of multiple pumps to prevent hydraulic shock and delayed shutdown to ensure complete drainage.
Key Benefits:
- Prevents water hammer effect
- Ensures complete system drainage
- Reduces pump wear and tear
Heating Systems
Delayed activation of heating elements after fan startup and delayed fan shutdown after heating stops.
Key Benefits:
- Prevents overheating of elements
- Ensures residual heat dissipation
- Improves energy efficiency
Automated Assembly Lines
Precise timing control for sequential operations in robotic assembly systems with independent on/off delays.
Key Benefits:
- Enables complex sequential operations
- Prevents tool collisions
- Optimizes production cycle times
Timing Sequence
Timing Operation:
1. Control signal (S) applied – on-delay timing (T1) starts
2. After preset time T1 – output (R) closes
3. Control signal (S) removed – off-delay timing (T2) starts
4. After preset time T2 – output (R) opens
Wiring Diagram
Connection Guide:
Standard DIN rail mounting with screw terminals for secure industrial connections:
- A1/A2: Power supply terminals
- S: Control signal input
- 11/12/14 & 21/22/24: Output contacts (C/O)
Parameter Setting
Time Adjustment Protocol:
Technical Specifications
| Parameter | FCT18-Xd1 | FCT18-Xd2 |
|---|---|---|
| Input terminal | A1-A2 | |
| Voltage range | AC230V / DC24V / ACDC12-240V | |
| Voltage tolerance | -15% ~ +10% | |
| Output type | 1 C/O contact | 2 C/O contacts |
| Rated current | 1×16A | 2×16A |
| Power consumption | AC 3.5VA / DC 2.0W | |
| Time delay setting accuracy | ±0.1% of full-scale value | |
| Repeat accuracy | Δt < ±0.5% | |
| Mechanical life | 10 million operations | |
| Electrical life | 100,000 operations | |
| Ambient temperature | -20°C to +60°C | |
| Mounting | DIN rail EN/IEC 60715 | |
| IP rating | IP20 | |
| Dimensions | 90×18×64mm | |
| Standards | IEC60947-5-1, EN6812-1 | |
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