Changing The Fuses In The Digital Modules - Siemens SIMATIC S7-400 Hardware And Installation Manual

7.5

Changing 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 AC 20-120 V/2A
(6ES7 422-5EH00-0AB0)
Digital output module SM 422;DO 8 x AC 120/230 V/5A
(6ES7 422-1FF00-0AA0)
Digital output module SM 422;DO 16 x AC 120/230 V/2A
(6ES7 422-1FH00-0AA0)
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.
S7-400 and M7-400 Programmable Controllers, Installation Manual
C79000-G7076-C424-01
www.gkbpx.com
Maintenance
7-9