10
LOADING AND INSTALLATION
10.1 General Safety Requirements
10 - 1
9
EMC AND LOW
VOLTAGE
DIRECTIVES
10
LOADING AND
INSTALLATION
11
MAINTENANCE AND
INSPECTION
12
TROUBLESHOOTING APPENDICES INDEX
CHAPTER10 LOADING AND INSTALLATION
In order to increase the reliability of the system and exploit the maximum performance of
its functions, this chapter describes the methods and precautions for the mounting and
installation of the system.
10.1 General Safety Requirements
DANGER
Install a safety circuit external to the programmable controller that keeps
the entire system safe even when there are problems with the external
power supply or the programmable controller. Otherwise, trouble could
result from erroneous output or erroneous operation.
(1) Outside the programmable controller, construct mechanical damage
preventing interlock circuits such as emergency stop, protective cir-
cuits, positioning upper and lower limits switches and interlocking
forward/reverse operations.
(2) The programmable controller stops its operation when the following
erroneous status is detected,
All the outputs are turned OFF in case (a).
All the outputs are held or turned OFF by the parameter setting in
case (b).
Note that the AnS/A series modules turn off all the outputs both in
case (a) and (b).
Table10.1 Output status of module at the time of programmable controller error
occurrence
In addition, all output will be turned on when there are problems that
the programmable controller CPU cannot detect, such as in the I/O
controller.
(3) Output could be left on or off when there is trouble in the outputs
module relay or transistor. So build an external monitoring circuit that
will monitor any signal outputs that could cause serious trouble.
When overcurrent which exceeds the rating or caused by short-circuited
load flows in the output module for a long time, it may cause smoke or
fire. To prevent this, configure an external safety circuit, such as fuse.
Build a circuit that turns on the external power supply when the program-
mable controller power is turned on. If the external power supply is
turned on first, it could result in erroneous output or erroneous operation.
When there are communication problems with the data link, refer to the
corresponding data link manual for the operating status of each station.
Not doing so could result in erroneous output or erroneous operation.
Q series module AnS/A series module
Output OFF Output OFF
All outputs are retained or
OFF by parameter
settings.
The power supply module has over current
protection equipment and over voltage
protection equipment.
The programmable controller CPUs
self-diagnosis functions, such as the watchdog
timer error, detect problems.
(a)
(b)
Output OFF
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