Gardner Denver L Series Service Manual page 4

Check and, if required, re-tighten connection terminals.
For further details, see the operating instructions.
Danger of electric shock from loaded condensers!
Please always first disconnect the system from the
power supply and wait another 10 minutes before
touching the electrical components. The power
condensers require this time in order to discharge!
WARNING
Indicates a hazard with a medium level of risk which, if not avoided, COULD result in death or
serious injury.
CAUTION
Indicates a hazard with a low level of risk which, if not avoided, MAY result in a minor or moderate
injury.
Burn Hazard – Hot surface
Check the DC bus voltage at the system terminal strip of
the frequency converter by measuring this between the
+DC and -DC terminals (the exact position can be found
in the supplied operating manual of the frequency
converter), between the +DC terminal and the chassis as
well as between the -DC terminal and the chassis.
The voltage must read zero in the case of all three
measurements.
13-25-638 v03 Page 4