246
FX
3U
Series Programmable Controllers
User’s Manual - Hardware Edition
12 Output Wiring Procedures
12.4 External Wiring for Triac (SSR) Output Type
12.4.2 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.
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 12.4.3 "External wiring precautions".
PLC
Load
100VAC
Fuse
COM1
Load
200VAC
Fuse
COM2
U
U
Y 0
Y 1
Y 4
Y 5
0.4A
0.7
sec
4A
10
sec
0.02
sec
<Example>
0.02 + 0.7 + 10
4
2
×
0.02 + 0.4
2
×
0.7
= 0.2A
Summary of Contents for FX2-16E series
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Page 8: ... 6 Safety Precautions Read these precautions before use MEMO ...
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