Siemens S5-135U/155U appendix Repair Guidelines

Central Controllers and Expansion Units Power Supply Units

4.1.4Repair Guidelines

If measurements or testing become necessary whilst the unit is operational, accident prevention regulations VBG 4.0 must be observed, especially the permissible actions when working on active parts.

Only use tools that are suitable and approved for working on electrical equipment.

SRepair of an automation system may only be carried out by the SIEMENS customer service or by qualified personnel (see above).

SAlways disconnect the AC power plug or open the isolating switch before opening the unit. Wait at least 8 minutes before pulling out and opening a power supply unit (see Section 4.2.3).

SParts or components of a central controller may only be replaced by types listed in Catalog ST 54.1 or in the appendix to this manual.

SFuses may only be replaced by the same type.

SInstructions for maintenance of the individual components can be found in the relevant chapters of this manual.

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Warning

Unauthorized opening and improper repairs can result in death or serious personal injury as well as considerable damage.

4-12	System Manual
	C79000-G8576-C199-06