WARNING
During Power Supply
Do not attempt to take any Unit apart.
In particular, high-voltage parts are present in the Power Supply Unit while power is
supplied or immediately after power is turned OFF
. Touching any of these parts may
result in electric shock. There are sharp parts inside the Unit that may cause injury.
Fail-safe Measures
Provide safety measures in external circuits to ensure safety in the system if an abnor-
mality occurs due to malfunction of the system or due to other external factors affecting
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 UPS used enables normal operation to continue for a certain period of time if a
momentary power interruption occurs. This means that the CK3M-series Controller
may receive incorrect signals from external devices that are also affected by the power
interruption. Accordingly
, take suitable actions, such as establishing external fail-safe
measures and interlock conditions, to monitor the power supply voltage of the external
device as required.
Unintended outputs may occur if an error occurs in internal data of the Controller. As a
countermeasure for these problems, external safety measures must be provided to en-
sure safe operation of the system.
The Controller will turn OFF all outputs of output units in the following cases and the
slaves will operate according to the settings in the slaves.
• If a power supply error occurs
•
If the connected power supply is faulty
• If a CPU Unit error (watchdog timer error) or CPU Unit reset occurs
• If a major fault level Controller error occurs
• While the Controller is on standby until RUN mode is entered after the power is
turned ON
• If a system initialization error occurs
External safety measures must be provided to ensure safe operation of the system in
such cases.
To ensure safe use of the Controller, correctly make the limit settings for the position,
speed, acceleration, jerk, current, and following error, as well as the encoder loss de-
tection.
For devices that move in a vertical direction, use a motor brake to prevent them from
falling down when the servo control is stopped.
Safety Precautions
13
CK3E-series Programmable Multi-Axis Controller User’s Manual Hardware (I610)
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