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5.2
Mains connections
When sizing motor contactors, feed lines and fuses:
• Use the maximum operating current or maximum
power consumption of the motor as a basis.
• Select the contacts according to the operational cat-
egory AC3.
Compare the voltage and frequency specifications on
the name plate with the data of the mains supply. The
motor may be connected only if the values match. Wire
the terminals in accordance with the schematic wiring
diagram.
!
!
NOTICE
Risk of compressor failure!
Operate the compressor only in the intended ro-
tation direction!
5.3
High-voltage test
The compressor had already been tested in the factory
for high voltage according to EN 60034-1 or according
to UL984 (and UL60335-2-34. Fourth Edition) for the
UL model.
!
!
NOTICE
Risk of defect on the insulation and motor fail-
ure!
Never repeat the high potential test in the same
way!
However, a test at reduced voltage is possible (e.g.
1000 V). Prior to the test, disconnect all electronic com-
ponents (motor protection devices etc.) from the sys-
tem. The reasons for this limitation is, among others,
the influence of oil and refrigerants on the electric
strength.
CAUTION
Risk of internal sparking and motor damage!
Do not perform the high-voltage test or insula-
tion tests while the compressor housing is in a
vacuum!
5.3.1
Soft starter and frequency inverter operation
Single ORBIT compressors may be genreally operated
in the range of 35-75 Hz. However, special attention
must be paid to start-up, ramp rate, and switching fre-
quency.
When operating with soft starter or frequency inverter,
contact BITZER.
5.4
Line start permanent magnet motor (LSPM)
Compressors marked with the letter "U” in the model
designation (e.g. GS
U
80295VAB) are equipped with a
line start permanent magnet motor (LSPM). The built-in
permanent magnets generate a non-negligible mag-
netic field which, however, is shielded by the com-
pressor housing.
Fig. 8: Warning and prohibition signs on a compressor with perman-
ent magnet motor
Safety signs attached to the compressor
WARNING
Strong magnetic field!
Keep magnetic and magnetizable objects away
from compressor!
Persons with cardiac pacemakers, implanted
heart defibrillators or metallic implants: maintain
a clearance of at least 30 cm!
Work on a compressor with LSPM motor
Any work on the compressor may only be performed by
persons who are not part of the above-mentioned
group. Maintenance work beyond the work described in
these operating instructions 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 electrical connection and screwed connec-
tions in the terminal box, oil change as well as inspec-
tion and replacement of the sight glass. No special
tools are needed for this work.
