Digital Output Module Ac 120/230 V: Replacing The Fuses - Siemens SIMATIC S7-300 Hardware And Installation Manual

Maintenance

10.6 Digital output module AC 120/230 V: Replacing the fuses

Fuses for Digital Outputs
the digital outputs of the following digital output modules are short-circuit protected
by individual fusing of the channel groups:
• Digit output module SM 322; DO 16 × A 120 V
• Digit output module SM 322; DO 8 × A 120 230 V
System check
Eliminate the causes of fuse tripping.
Replacement fuses
If replacement is required, you can use the following fuses:
• 8 A, 250 V fuse
Wickmann 19 194-8 A
–
Schurter SP001.013
–
Littlefuse 217.008
–
• Fuse holder
Wickmann 19 653
–
Warning
Improper handling of digital output modules could result in injury or damage to
property.
There are dangerous voltages > AC 25 V or > DC 60 V beneath the covers to the
right of the module. Before you open these covers, make sure that you have either
unplugged the front connector from the module or you have disconnected the
module from the supply voltage.
Warning
Improper handling of front connectors could result in injury or damage to property.
When you remove the front connector during operation, beware of dangerous live
voltage > 25 VAC or > 60 VDC across the pins.
If the front connector is wired to such voltages, hot swapping of modules must
always be carried out by skilled or instructed electrical staff, in order to avoid
unintentional contact to the module pins.
10-12
S7-300 Programmable Controller Hardware and Installation
A5E00105492-02