External Wiring For Triac (Ssr) Output Type; Handling Of Triac Output - Mitsubishi FX3U SERIES User Manual

FX Series Programmable Controllers
3U
User's Manual - Hardware Edition
12.4

External Wiring for Triac (SSR) Output Type

This section explains the procedures for handling triac output and external wiring.
• There are not triac output type of main units.
Select from the input/output powered extension units/blocks.
• For the input/output powered extension units/blocks, refer to Subsection 12.4.1 "Handling of triac output"
and Subsection 12.4.2 "External wiring precautions". For the specifications and wiring examples, refer to
the specifications for each model.

12.4.1 Handling of triac output

1. Output terminals
On the triac output type units/blocks, one common terminal is
used for 4 or 8 points.
Therefore, the common terminal blocks can drive loads of
different circuit voltage systems (for example, 100V AC and
200V AC).
2. Circuit insulation
The PLC internal circuit and the output element (triac) are insulated with a photo-thyristor.
The common terminal blocks are separate from one another.
3. Display of operation
When the photo-thyristor is driven, the LED is lit, and the output triac is turned on.
4. Response time
The time from when the photo-thyristor is driven or shut down until the output triac is turned on and until it is
turned off is 1ms or less and 10ms or less, respectively.
5. Output current
The max current per output point is 0.3A. However, to restrict temperature rise, the max current per one
output from four points should be 0.8A (average per point is 0.2A).
When a load with high rush current is turned on and off frequently, the root-mean-square current should be
0.2A or less.
<Example>
× 0.02 + 0.4
4 2
0.02 + 0.7 + 10
6. Open circuit leakage current
A C-R absorber is connected for turn-off in parallel with the triac output terminal of this type of PLC.
Therefore, when the circuit opens, a leakage current will be 1mA at 100V AC and 2mA at 200V AC.
Since the triac output type devices leak current when the circuits are open, small-size relays and micro
current loads having low rated operating current may keep operating even when the triac output is turned off.
Therefore, use a load of 0.4VA or more at 100V AC or 1.6VA or more at 200V AC. If the load is less than this
value, connect a surge absorber as stated below in parallel with the load.
→ For the connection of the surge absorber, refer to Subsection 12.4.2 "External wiring precautions".
220
→ For specifications on the input/output powered extension units, refer to Chapter 15.
→ For specifications on the input/output extension blocks, refer to Chapter 16.
× 0.7
2
= 0.2A
12.4 External Wiring for Triac (SSR) Output Type
0.4A
4A
0.02 0.7 10
sec sec sec
12 Output Wiring Procedures
FX
2N
Load
Y0
Y1
Fuse
100VAC
COM1
Load
Y0
Y1
Fuse
200VAC
COM2
-16EYS
U
U
PLC