User`s manual

2-2
(7) Wiring
- Be aware not to confuse the connection polarity of 5 VDC on the expansion rack panel. Otherwise,
rack panel and I/O module etc. may be damaged.
- Keep the input/output lines away from high voltage or strong current lines such as power lines.
(8) Cautions for static electricity
Significant volume of static electricity may build up on the human body in extremely dry conditions.
Prior to touching the JW300, discharge the static electricity by touching grounded metals.
(9) Cleaning
Use the soft cloths for cleaning. Volatile solvents (alcohol, paint thinner, freon etc.) and wet rags
may cause deformation or change of color.
(10) Storage
Keep the JW300 in cool and dry conditions as it equipped with a battery for memory backup. High
ambient temperature may shorten its battery life.
Do not put other objects on the JW300.
(11) Short circuit protection
If the load connected to the output terminal shorts circuits, the output device or the printed circuit
board may burn. Insert a protective fuse in the output lines.
We recommend that you install protective fuses in each line, even if the external devices have
fuses for each common unit. These common line fuses are to protect the device against burnout
caused by overload, and do not protect against overcurrent of output element and load.
[Precautions when using a rated voltage power source]
When you use a power supply for loads that have a current
limiting circuit, provide fuses that match the load rating of
each output module. If the load is shorted, and the current
limiting circuit functions, the short-circuit current will flow at
current level lower than needed to blow the fuse.
(12) Insulation transformer
Choose isolation transformer with a capacity 20% or higher than the rated load. When a transformer
of the same capacity as that of the rated load is used, the primary input voltage might exceed the
rated transformer capacity.
* Maximum load capacity when one power
supply module is used.
(13) Max. No. of I/O points
Each control module has a maximum number of input and output points, but the number of relay
points affecting the maximum number of input and output points varies with the type of the module.
It must be noted that it is different from the number of relay assignments. => See page 7-10
(14) Special I/O modules
If a preset scanning time is too short ( less than 2 ms), the special I/O module such as JW-21SU
and JW-22DA may not function normally.
To avoid this malfunction, set a longer scanning time using a constant scanning (set 3 ms or more
on the system memory #0226) or other functions.
(15) Insulation resistance and dielectrical strength tests of the power supply module
When testing insulation resistance or dielectrical strength of the JW-301PU/31PU power supply
modules, be sure to remove the short bar connected between the SHORT terminal and the GND
terminal. If a test is carried out without removing the short bar, internal elements of the module
may be damaged.
Output module
Load
Fuse
COM
Power supply load
1
0
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JW-301PU
JW-22PU
JW-31PU
JW-303PU