KT-420-4 // PDF Download
47
0
140
80
40
20
P
100
60
M
0
10
20
30
40
50
60
120
f [Hz]
I
P
M
I
[%]
1 0
6
0
0
250
850
550
1450
2050
n [min
-1
]
0
0
100
300
200
400 ....................400 U [V]
1150
1750
2350
70
80
Fig. 11: Operating characteristics of a compressor motor for operation with frequency inverter (400 V/3/50 Hz) with reserve.
P: max. compressor power consumption
M: max. torque of the motor at compressor shaft
I: max. compressor current consumption
f: frequency (frequency inverter output)
U: voltage (frequency inverter output)
Standard motors
For common applications, BITZER suggests using the standard motors 40S or 40P (Speed and frequency ranges
of BITZER reciprocating compressors). They are very economical and have a large range of operation. The
BITZER SOFTWARE indicates the standard motor for each compressor. Supply voltage is
• 400 V at 50 Hz resp.
• 460 V at 60 Hz.
LSPM Motors
Compressors equipped with a line start permanent magnet motor (LSPM motor) can be identified by the letters "U"
and "L" added to the type designation (e. g. 6CTEU-50LK). The built-in permanent magnets generate a non-negli-
gible magnetic field which, however, is shielded by the compressor housing.
Fig. 12: Warning and prohibition signs on a compressor with permanent magnet motor
