Yaskawa 120 Series I/O Modules - Manual (Page 282)

7.1 Built-in Fuses
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7.1.2 Built-in Fuses
1) AC 16-point Output Modules
Do not replace the built-in fuses of the AC 16-point Output Modules.
If the built-in fuses are replaced by anyone other than a Yaskawa-approved
technician, a failure or a malfunction may occur in the AC 16-point Output Mod-
ules, and the guarantee is void.
a) The fuse inside an AC 16-point Output Module is not to protect the output circuit.
The fuse prevents the Module from damage that may occur in the following cases:
• External causes: For example, when over-voltage is applied to the power termi-
nals for driving load of the AC 16-point Output Module.
• Internal causes: For example, when foreign matter such as chips are present in
the AC 16-point Output Module, and thereby short-circuiting the
internal circuits.
b) When the built-in fuses are blown out, the indicator lamp “F” of the AC 16-point Out-
put Module is lit. If the fuses are blown out, eliminate the cause and replace the
Module with a spare AC 16-point Output Module.
2) DC 8-point Output Modules
Do not replace the built-in fuses of the DC 8-point Output Modules.
If the built-in fuses are replaced by anyone other than a Yaskawa-approved
technician, a failure or malfunction may occur in the DC 8-point Output Mod-
ules, and the guarantee is void.
a) The fuse inside a DC 8-point Output Module is not to protect the output circuit. The
fuse prevents the Module from damage that may occur in the following cases:
• External causes: For example, when over-voltage is applied to the power termi-
nals for driving load of the DC 8-point Output Module.
• Internal causes: For example, when foreign matter such as chips are present in
the DC 8-point Output Module, and thereby short-circuiting the
internal circuits.
b) Neither the fuse blowout detecting circuit nor indication lamp is provided in the DC 8-
point Output Modules.
If the output current does not flow though the rated voltage is applied to the DC 8-
point Output Module and the output signal indicator lamp is lit, the built-in fuse may
be blown out. If the fuse is blown out, eliminate the cause and replace the Module
with a spare DC 8-point Output Module.
CAUTION
CAUTION