Three Phase Electrical Characteristics; Single Phase Electrical Characteristics; Lra (Locked Rotor Amp); Mcc (Maximum Continuous Current) - Danfoss MLZ Selection & Application Manuallines

A
PPLICATION GUIDELINES
Three phase electrical
characteristics
Single phase electrical
characteristics

LRA (Locked Rotor Amp)

MCC (Maximum Continu-
ous Current)
Max Oper. A (Maximum
Operating Amp)
E ,
LECTRICAL DATA CONNECTIONS AND WIRING
Compressor model
MLZ/MLM015T4
MLZ/MLM019T4
MLZ/MLM021T4
MLZ/MLM026T4
MLZ/MLM030T4
MLZ/MLM038T4
MLZ/MLM045T4
MLZ/MLM048T4
MLZ/MLM058T4
MLZ/MLM066T4
MLZ/MLM076T4
MLZ019T2
MLZ021T2
MLZ026T2
MLZ030T2
MLZ038T2
MLZ045T2
MLZ048T2
MLZ058T2
MLZ066T2
MLZ076T2
Compressor model
MLZ/MLM 015T5
MLZ/MLM 019T5
MLZ/MLM 021T5
MLZ/MLM 026T5
MLZ/MLM 030T5
MLZ/MLM 038T5
MLZ019T1
MLZ021T1
MLZ026T1
MLZ030T1
MLZ038T1
LRA is the higher average current as measured on
a mechanically blocked compressor tested under
nominal voltage. LRA is printed on the name-
plate.
The MCC is the current at which the internal mo-
tor protection trips under maximum load and low
voltage conditions.
The Max Oper. A is the current when the compres-
sor operates at maximum load conditions and
10% below nominal voltage.
This value which is the max rated load current for
the compressor is new on the nameplate.
FRCC.PC.016.A1.22
LRA MCC Max Oper.A
A A A
45 9.5 6.7
45 9.5 6.8
45 11 8.3
60 13 9.8
70 15 11.7
82 15 14.1
87 16 15.3
95 20 18.1
110 24 20.3
140 25 23.9
95 17.5 13.3
95 17.5 13.6
95 22.0 16.6
120 26.0 19.7
123 26.0 23.5
170 30.0 28.2
190 37.0 30.6
190 40.0 36.1
235 46.0 40.7
235 50.0 47.6
LRA MCC Max. Oper. A
A A
97 23.0 18.3
97 25.0 19.5
97 27.0 24.2
127 32.0 28.9
130 42.0 33.9
97 25.0 19.9
97 24.5 21.4
115 31.5 26.8
150 38.0 31.9
160 45.0 37.2
The LRA value can be used as a rough estimation
for the starting current. However in most cases,
the real starting current will be lower. Many coun-
tries have defined limits for the starting current in
domestic use. A soft starter can be applied to re-
duce starting current.
This MCC value is the maximum at which the com-
pressor can be operated in transient conditions
and out of the application envelope. Above this
value the overload will switch off to protect the
motor.
Max Oper. A can be used to select cables and con-
tactors.
In normal operation, the compressor current
consumption is always less than the Max Oper. A
value.
Winding resistance (Ω)
T1-T3 T1-T2 T2-T3
3.4 4.7 4.7
3.4 4.7 4.7
3.4 4.7 4.7
2.6 2.6 2.6
2.3 2.3 2.4
1.9 1.9 1.8
1.7 1.7 1.7
1.4 1.4 1.4
1.3 1.3 1.3
1.1 1.1 1.1
0.87 1.18 1.18
0.87 1.18 1.18
0.87 1.18 1.18
0.67 0.67 0.68
0.60 0.60 0.61
0.48 0.46 0.48
0.43 0.44 0.43
0.37 0.37 0.37
0.32 0.32 0.33
0.32 0.32 0.33
Winding resistance (Ω)
A run start
0.69 1.51
0.69 1.51
0.69 1.51
0.42 1.31
0.39 1.02
0.67 1.57
0.67 1.57
0.55 1.47
0.34 0.90
0.28 1.76
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