4-2
Fail-safe Circuits
WARNING
Provide safety measures in external circuits to ensure safety in the system if an ab-
normality occurs due to malfunction of the system due to other external factors af
fect-
ing operation. Not doing so may result in serious accidents due to incorrect operation.
•
Emergency stop circuits, interlock circuits, limit circuits, and similar safety measures
must be provided in external control circuits.
• You must take fail-safe measures to ensure safety in the event of incorrect, missing,
or abnormal signals caused by broken signal lines, momentary power interruptions,
or other causes.
• The use of an Uninterruptible Power Supply (UPS) allows normal operation to con-
tinue even if a momentary power interruption occurs, possibly resulting in the recep-
tion of an erroneous signal from an external device affected by the momentary pow-
er failure. Take external fail-safe measures. Where necessary, monitor the power
supply voltage on the system for external devices and use it as an interlock condi-
tion.
• Unintended behavior may occur if an error occurs in the internal memory of the
product. As a countermeasure for these problems, external safety measures must
be provided to ensure safe operation of the system.
• The Controller will turn OFF all outputs from Output Units in the following cases.
The slaves will operate according to the settings in the slaves.
a) If a power supply error occurs
b) If the power supply connection becomes faulty
c) If a CPU Unit error (watchdog timer error) or CPU Unit reset occurs
d) If a major fault level Controller error occurs
e) While the Controller is on standby until RUN mode is entered after the power is
turned ON
f) If a system initialization error occurs
As a countermeasure for these problems, external safety measures must be provided
to ensure safe operation of the system.
• The outputs may remain ON or OFF due to welding or burning of the output relays
or destruction of the output transistors. As a countermeasure for these problems,
external safety measures must be provided to ensure safe operation of the system.
• To ensure safe use of the Controller, correctly make the limit settings for the posi-
tion, speed, acceleration, jerk, current, and following error, as well as the encoder
loss detection.
• For devices that move in a vertical direction, use a motor brake to prevent them
from falling down when the servo control is stopped.
4 Installation
4-4
CK3M-series Programmable Multi-Axis Controller User's Manual Hardware (O036)
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