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14 Safety instructions
Electrical safety in installation, start-up and maintenance
Precautions before electrical work
￭
These instructions are for the qualified electricians who do work on the converter, generator
cable or generator.
WARNING!
Obey these instructions. If you ignore them, injury or death, or damage to the
equipment can occur. If you are not a qualified electrical professional, do not do
electrical installation or maintenance work. Do these steps before you do installation
or maintenance work.
1. Clearly identify the work location.
2. Disconnect all possible voltage sources.
• Open the main circuit breaker (Q1), disconnect, lock and attach a warning notice to
it. See section
Opening and disconnecting the main circuit breaker (page
• Open the charging circuit switch-disconnector (Q10). See section
charging circuit from the main circuit (page
• Open and lock out the auxiliary voltage circuit breakers (Q2 and Q3). See section
Disconnecting the auxiliary power supply (page
• Note the voltage sources from UPS: Open the circuit breaker F31.
• Disconnect any external dangerous voltages from the control circuits (such as relay
outputs).
• Open, disconnect and lock out the breaker of the grid transformer as the main circuit
breaker of the converter does not remove the voltage from the grid cable busbars
and some auxiliary circuits. Attach a warning notice to the disconnector.
• Lock the turbine rotor (and generator shaft).
• Open the safety switch between the generator-side converter and the generator (if
any).
• After you disconnect the converter, always wait for five minutes to let the intermediate
circuit capacitors discharge before you continue.
3. Protect any other energized parts in the work location against contact.
4. Take special precautions when close to bare conductors.
Disconnecting the
19).
20).
17).
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