High Potential Test (Insulation Strength Test); Line Start Permanent Magnet Motor (Lspm); Overload Protection For Lspm Motors - Bitzer 2KES-05 Instructions De Service

Option for:
• 4VE(S)-6Y .. 4NE(S)-20(Y)
• 4JE-13Y .. 4FE-35(Y)
• 6JE-22Y .. 6FE-50(Y)
• 44VE(S)-14(Y) .. 44NE(S)-40(Y)
• 44JE-30(Y) .. 44FE-70(Y)
• 66JE-50(Y) .. 66FE-100(Y)
Upon request:
• 8GE-50(Y) .. 8FE-70(Y)

5.2 High potential test (insulation strength test)

The compressor was already submitted to a high po-
tential test in the factory according to EN12693 or ac-
cording to UL984 or UL60335-2-34 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 repeated test at reduced voltage of max.
1000 V AC is possible.

5.3 Line start permanent magnet motor (LSPM)

Compressors equipped with a line start permanent
magnet motor (LSPM) can be identified by the letter "L"
added to the type designation (e. g. 6CTEU-50LK or
4JTC-10LK). The built-in permanent magnets generate
a non-negligible magnetic field which, however, is shiel-
ded by the compressor housing.
Fig. 21: Warning and prohibition signs on a compressor with perman-
ent magnet motor
KB-104-7
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 that are not part of the specified group. Main-
tenance 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 ter-
minal box, oil change as well as inspection and re-
placement 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!
5.3.1

Overload protection for LSPM motors

The PTC temperature sensor integrated in the stator as
a standard protects the LSPM motor from overload
when the temperature rises (e. g. in case of prolonged
locked rotor conditions). It is recommended installing
an additional overload protective device that reacts
more quickly, since repeated locking conditions would
damage the magnets. Be sure that it is properly sized
to ensure quick protection against serious electrical
faults below the trigger level of the compressor fuse.
For example, an overload relay with adjustable time or
thermal overload switch may be selected.
• Allowed current values and durations:
– Starting: max. 0.5 s (1.25 x LRA)
– Operation: max. 2 s (1.25 x max operating cur-
rent)
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