Yokogawa F3YA08-2N TRIAC Output Module Technical Guide
Product Introduction
The Yokogawa F3YA08-2N belongs to the FA-M3 output module family. Specifically, it delivers eight TRIAC contact outputs with a shared common line. The module accepts 100–240 VAC load voltages and provides 1500 VAC isolation between field wiring and internal circuits. In addition, it uses a 10-point terminal block with M3.5 screws for field connections. This design simplifies wiring in compact control panels. Meanwhile, the FA-M3 platform supports up to 8192 I/O points, so the F3YA08-2N integrates into both small and large configurations.
Core Value
Firstly, the F3YA08-2N eliminates the need for interposing relays when switching AC loads. Consequently, panel space decreases and wiring complexity drops. Secondly, photocoupler isolation protects the controller backplane from transient voltages on the AC side. Thirdly, the module reports 1 ms maximum response time for OFF-to-ON transitions. Therefore, it meets the demands of moderate-speed AC control tasks. Besides, the TRIAC design produces no mechanical wear. Hence, service life exceeds that of electromechanical relay outputs in frequent switching applications.
Technical Insights
The F3YA08-2N provides 8 output points with one common terminal. Specifically, each point carries 1 A at ambient temperatures from 0 to 40°C. Above 40°C and up to 55°C, the per-point rating derates to 0.7 A. Meanwhile, the common line maximum is 3 A. Therefore, you must aggregate simultaneous loads carefully. In addition, the module includes a built-in 4 A time-lag fuse at the COM terminal. However, this fuse is not replaceable. Furthermore, the OFF-state leakage current reaches 3 mA maximum. Hence, very low-current loads may not turn off completely. Besides, the module requires no external power supply. Finally, note that the F3YA08-2N is not UL-certified.
Installation & Maintenance
Firstly, always de-energize field power before inserting or removing the module. Secondly, separate AC load wiring from signal-level cables to preserve isolation integrity. Thirdly, install a surge protector across any inductive load, such as a relay coil or solenoid. Besides, verify that the external supply polarity is correct. In addition, tighten terminal screws to the cabinet standard torque specification. Meanwhile, monitor the LED indicators for output status. However, the LED circuit operates independently from the output element, so an LED may not reflect actual contact state during a fault. Therefore, periodic verification with a clamp meter is recommended. Finally, never leave a short-circuited load connected for extended periods, because persistent short-circuit current can degrade the module case.
Buyer’s Guide FAQ
Q1: How many outputs does the Yokogawa F3YA08-2N provide?
A1: The F3YA08-2N provides 8 TRIAC output points with a single common line.
Q2: What load voltage range does this module support?
A2: It supports 100–240 VAC loads, with a maximum of 264 VAC.
Q3: Can I use the F3YA08-2N with inductive loads?
A3: Yes, but you must add a surge protector near the load to suppress voltage spikes.
Q4: Does the module require an external power supply?
A4: No, the F3YA08-2N draws internal power from the FA-M3 backplane.
Q5: Is hot-swap supported for the F3YA08-2N?
A5: No, always remove field power before module replacement to prevent damage.
