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M800VW/M80VW Series Connection and Setup Manual
4 General Specifications
4.11 Laser I/F Unit
<Precautions>
Influence on the relay life by a connected load
An actual relay life can be substantially shortened depending on the type of a connected load and the characteristics of its
inrush current.
The inrush current generated by a connected load can lead to contact welding of the module.
To prevent shortening of the relay life and contact welding, take the following measures:
- Considering the possibility of a high inrush current, select a load so that the inrush current generated by the connected
load falls within the range of the rated current of the module.
- Connect a relay capable of withstanding the inrush current, outside the module.
The following table lists the relations between typical loads and each inrush current.
Select a load so that the inrush current, i, and rated current, io, fall within the range of the rated switching current
described in the module specifications.
Depending on the load amount, the inrush current may flow for a long time.
Load type
Load of a solenoid
i
Inductive load
0.07 to 0.1 seconds
Load of an incandescent bulb
i
Approx. 0.33 seconds
Lamp load
Load of a fluorescent
i
Within 10 seconds
Capacitive load (*2)
Capacitive load
i
Note
(*1) A typical discharge lamp circuit is configured with a combination of discharge tubes, transformers, choke coils,
capacitors and others. Because of this, be especially careful of the case of a high power factor and a low power sup-
ply impedance, where the inrush current flowing into the output module can be 20 to 40 times as high as the rated
current.
(*2) When the wiring is long, be careful with the cable capacity as well.
Inrush current "i"/
Waveform
Rated current "io"
Approx. 10 to 20
times
io
i: Inrush current
io: Rated current
Approx. 3 to 10 times
io
i: Inrush current
io: Rated current
Approx. 5 to 10 times -
io
i: Inrush current
io: Rated current
Approx. 20 to 40
times
io
i: Inrush current
io: Rated current
0.008 to 0.33 seconds
(0.5 to 2 cycles)
Waveform
Load of an electromagnetic contactor
i
io
0.017 to 0.033 seconds
(1 to 2 cycles)
Load of a mercury lamp
i
180 to 300 seconds
(3 to 5 minutes)
-
149
Inrush current "i"/
Rated current "io"
Approx. 3 to 10 times
i: Inrush current
io: Rated current
Approx. 3 times (*1)
io
i: Inrush current
io: Rated current
-
-
IB-1501612-C
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