Installation 3.5 Commissioning
Page 40 Operating instructions for S 40-3...S 150-3 series screw compressors
Drive with frequency converter
Never omit a single safety step! Otherwise, you will risk injuries due to restart-
ing, electric shock or self-releasing parts.
3.5 Commissioning
DANGER: High voltage!
Depending upon operational conditions, electrical drive systems with a fre-
quency converter may have an earth leakage current above 10 mA.
Therefore the required precautions must be taken as soon as the compres-
sor is electrically connected.
A permanently installed connection is required.
One or more of the following qualifications for the protective earth conductor
must be fulfilled:
1. The protective earth conductor must have a minimum cross-section of
10 mm
2
Cu along the whole of its length.
2. If the protective conductor has a minimum cross-section of less than
10 mm
2
Cu, a second conductor with at least the same cross-section
must be provided up to the point at which the protective conductor has
a minimum cross-section of more than 10 mm
2
.
3. Automatic interruption of the power supply if the conductivity of the pro-
tective earth conductor is lost.
Please observe any additional national rules and regulations.
WARNING: Risk of injury!
Prior to any work on the compressor:
1. Press the emergency stop button, disconnect the power supply using the
mains disconnection device and affix a padlock to prevent it from being
switched on again unintentionally.
2. Check to ensure that all conducting machine parts are voltage free.
3. Depressurise all areas under pressure.
WARNING!
If the automatic restart (Auto-Restart) is activated, the compressor may re-
start automatically after a voltage failure
This is conditional upon: The net pressure being lower than the set switch-
on pressure.
NOTICE!
We recommend drawing up a commissioning certificate in which the test
results during the commissioning process can be recorded.
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