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5 Maintenance
5.1 Safety recommendation
! WARNING Pay heed to strict adhering to
instructions. Unconditionally pay heed to necessary professional knowledge that must be acquired while
operating in heavy-current machinery.
Before any work on machines is started, make sure that machine or unit is disconnected in accordance to
regulations. This applies especially for opening of protective covers.
Pay heed not only to main current circuits but also to possible supplementary auxiliary current circuits. This
especially applies to heater in the course of stoppage of machine.
5.2 Five safety rules
The usual "five safety rules", according to DIN VDE 0105-100, for example, are:
- disconnection
- securing that prevents new connection
- make sure that machine is disconnected
- earthing and short-circuit connection (for voltage above 1000 V)
- block or cover (close) neighbouring active parts.
NOTICE : Cross-section drawings and or detailed drawings that are a part of instructions, usually contain
useful information on technical construction of normal machines and constructional groups. This information
can be appreciated by experts and should be taken into consideration in a certain way.
ATTENTION : Special designs and constructional variants can differ from normal projections as far as technical
details are concerned. We are here to solve any potential uncertainty, please, contact us and provide us with
type and production number of a machine. Other possibility is to contact directly SIEMENS service centre and
have maintenance works performed by the centre.
WARNING : Any works that are performed on generator must be carried out on disconnected machine, apart
from relubrication of bearings. In that particular case it is necessary to adhere to safety instructions. If the
works are performed on the parts of machine or accessories under current , make sure that generator is
always separated from the network. At the same time check if these parts are not under voltage. Protective
wire must always be connected.
5.3 Inspection of insulation condition
Condition of generator insulation must be inspected during every maintenance and prior to putting into
operation in case of longer period of a shut down.
5.4 Cleaning
Generator and its accessories must be kept in clean condition. Cleaning must be carried out in dependence
on operational requirements.
The best way of cleaning is to use clean and dry pressed air (most 200 kpa). Collecting dust decreases
cooling capacity and increases raise of temperature of machine.
If generator is fitted with a filter in the inlet spot of cooling air, then it must be cleaned regularly. Cleaning
intervals depend on conditions of ambient surrounding in which generator operates. Degree of contamination
can be assessed in dependence on increase of temperature of stator winding which is normally equipped with
resistance thermometer (concerning designs with a filter). Filter is disassembled and blown with pressed air.
Keep a record of cleaning in the operational log.
Product documentation 1D 3.8.en
"General safety
Rev. E, 10/13
information" in paragraph 1.2 of these
page 36/42
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