Siemens S7-400 Changing the Fuses in the Digital Modules, Modules with Fuses, Check the Plant

Maintenance

7.5Changing the Fuses in the Digital Modules

Modules with Fuses

The following modules have fuses which you can change yourself if they are defective:

•Digital output module SM 422; DO 16 x DC 20--125 V/1,5A (6ES7422-5EH10-0AB0)

•Digital output module SM 422; DO 16 x AC 20-120 V/2A (6ES7422-5EH00-0AB0)

•Digital output module SM 422;DO 8 x AC 120/230 V/5A (6ES7422-1FF00-0AA0)

•Digital output module SM 422;DO 16 x AC 120/230 V/2A (6ES7422-1FH00-0AA0)

Check the Plant

Correct the faults which led to the fuses blowing.

Changing the Fuses

To change the fuses in a digital module, you must remove the front connector from the digital module and remove the module from the rack.

!	Warning
	Improper handling of the digital modules can result in injury and damage.

Hazardous voltages of >25 VAC or >60 VDC may be present below the covers on the right-hand side of the module.

Before you open these covers, ensure that either the front connector for the module is removed or the module is disconnected from the voltage supply.

Automation System S7-400	Hardware and Installation	7-9
A5E00850741-01