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10 FUNCTIONS
10.6 Protection Function
10.6
Protection Function
The following table lists protection functions.
The following table lists the modules to be protected by each protection function.
• The protection functions protect the module's internal circuits, not intended to protect external devices.
• When an overload (overvoltage, overcurrent) occurs, the temperature inside the module may rise, which
may deteriorate output elements or discolor the case or printed circuit board. When a load error occurs, turn
off the related outputs immediately and eliminate the cause.
Function name
Purpose
Description
Module power supply overvoltage protection
Protects against ignition and burnout originated from
the I/O module with diagnostic functions due to an
overvoltage on the primary side.
Activated when an overvoltage occurs in the module
power supply.
Module power supply overcurrent protection
Protects against ignition and burnout originated from
the I/O module with diagnostic functions due to an
overcurrent on the primary side.
Activated when an overcurrent occurs in the module
power supply.
Overload protection
Protects against ignition and burnout originated from
the I/O module with diagnostic functions due to an
overcurrent or overheating attributable to a short-
circuit in the output circuit.
Activated when a current exceeding the rated value
flows. In addition, an output read-back error (error
code: 2002H) will occur. Returns to the normal state
when the remote head module is reset or the power is
turned off and on after the load goes down to the level
of the rated load.
Overheat protection
Protects against ignition and burnout originated from
the output module with diagnostic functions due to an
overheat condition attributable to overcurrent in the
output circuit.
When a high heat is detected inside the module, the
outputs are turned off. In addition, an output read-back
error (error code: 2002H) will occur. Returns to the
normal state when the remote head module is reset or
the power is turned off and on after the heat decreases
to a certain level.
Function name
Protection target
Input module with diagnostic functions
Output module with diagnostic functions
Module power supply overvoltage protection
Module power supply overcurrent protection
Overload protection
Overheat protection
Summary of Contents for MELSEC iQ-RX40NC6B
Page 1: ...MELSEC iQ R I O Module With Diagnostic Functions User s Manual Application RX40NC6B RY40PT5B ...
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Page 125: ...4 OVERVIEW 123 4 MEMO ...
Page 191: ...12 MAINTENANCE AND INSPECTION 189 12 MEMO ...
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