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8.5
Protection Functions
The following table lists the protection functions.
Function name
Module power supply overvoltage
protection
Module power supply overcurrent
protection
External power supply
overvoltage protection
External power supply
overcurrent protection
Output overload protection
The following table lists the modules each protection function can protect.
: Available, : Not available
Function name
Module power supply overvoltage
protection
Module power supply overcurrent
protection
External power supply
overvoltage protection
External power supply
overcurrent protection
Output overload protection
• The protection functions are intended to protect the internal circuit of a module, not to protect external
devices.
• An overload (overvoltage or overcurrent) may cause the internal temperature of the module to rise, resulting
in deterioration in output elements and discoloration on the case and the printed-circuit board. When an
abnormal load is found, turn off the corresponding output immediately and eliminate the cause.
8 FUNCTIONS
108
8.5 Protection Functions
Purpose
Prevents ignition or burnouts from/of the safety remote I/O
module due to overvoltage on the primary side.
Prevents ignition or burnouts from/of the safety remote I/O
module due to overcurrent on the primary side.
Prevents ignition or burnouts from/of the safety remote I/O
module and load circuits due to overvoltage.
Prevents ignition or burnouts from/of the safety remote I/O
module and load circuits due to overcurrent.
Prevents ignition or burnouts from/of the safety remote I/O
module due to overcurrent or overheat resulting from short-
circuits of the output circuit.
Protection target
NZ2GFSS2-32D-
NZ2GFSS2-8D-S1
S1
Description
This function operates when the module power supply is in
the overvoltage state.
This function operates when the module power supply is in
the overcurrent state.
This function operates when the external power supply
circuit is in the overvoltage state.
This function operates when the external power supply
circuit is in the overcurrent state.
This function operates when a current exceeding the rating
flows. The safety remote I/O module recovers by resetting it
in the rated load state.
NZ2GFSS2-8TE-
NZ2GFSS2-
S1
16DTE-S1
NZ2EXSS2-8TE
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Troubleshooting
