KT-420-4 // PDF Download
60
Work on a compressor with LSPM motor
Any work on the compressor may only be performed by persons that are not part of the specified group. Mainten-
ance work beyond the work described in the present document and in the Operating Instructions KB-104 may only
be performed after consultation with BITZER.
WARNING
Induction, electric voltage!
Never operate the motor with the terminal box open!
When the rotor rotates, electric voltage is induced in the terminal pins – even with the motor switched off.
Permitted work on a compressor with LSPM motor
Work on the electric supply and screw fixings in the terminal box, oil change as well as inspection and replacement
of pressure relief valves, cylinder banks and sight glass. No special tools are needed for this work. Before opening
the compressor, thoroughly clean its environment. Pay special attention to loose metal particles! Do not open the
motor cover!
7
Commissioning
7.1
Configuration of the frequency inverter
For work on the frequency inverter (FI):
DANGER
Life-threatening voltages inside the FI housing!
Contact can lead to serious injuries or death.
Never open the FI housing in operation!
Switch off the main switch and secure it against being switched on again.
Wait for at least 5 minutes until all capacitors have been discharged!
Before switching on again, close the FI housing.
CAUTION
In operation, the heat sink of the frequency inverter will get hot.
Risk of burns upon contact!
Prior to performing work on the frequency inverter, disconnect the power supply and wait for at least 15
minutes until the heat sink has cooled down.
!
!
NOTICE
Risk of frequency inverter failure caused by over-voltage!
Always disconnect the frequency inverter from the circuit to be tested before any high-voltage tests or an in-
sulation test on lines in operation!
!
!
NOTICE
Risk of motor damage!
Check the switching frequency of the converter in the frequency inverter and set it, if necessary! Recom-
mended value: 2 .. 6 kHz
• Set the minimum and maximum frequency (or speed)
• Set the nominal motor data (see name plate)
– current
