Three Phase Electrical Characteristics; Three Phase Motor Protection And Suggested Wiring Diagram - Danfoss Maneurop NTZ Series Selection & Application Manuallines

ELECTRICAL CONNECTIONS AND WIRING
Three phase electrical
characteristics
(Locked Rotor Amp)
Compressor
model
3
NTZ048 32
NTZ068 48.5
NTZ096 72
NTZ108 72
NTZ136 97.2
NTZ215 147.7
NTZ271 198
Three phase motor
protection and
suggested wiring
diagram
FU Fuses
MS Main switch
C1 Compressor contactor
TH Thermostat
EC External controls
COMP Compressor
PTC Crankcase heater
IOL Internal overload line break
LRA
(Maximum Continuous Current)
A
4 9
16 22 10.1
25 29 14.8
32 20.4
45 57 21.4
51 64 29
74 110 42.3
96 150 56.5
Three phase compressors are inter-
nally protected by a temperature /
current-sensing bimetallic protector,
connected to the neutral point of the
star-connected stator windings. This
internal overload line break protects
the motor against overheating, cur-
MCC
A
3 4 9
4.8 5
8.4 8.5
10.1
12.1 11
14.3 15
22.3 23
27.0 30
FU
MS
C1
Comp.
IOL
Winding resistance
(between phases +/- 7% at 25°C)
Ohm
3 4
2.80 11.55
1.58 7.11
1.20 5.03
1.20 4.00
0.98 3.80
0.57 2.23
0.41 1.61
rent overload and locked rotor con-
ditions. If the motor were to be over-
loaded and the protector trips, all
3-phases are cut out. It might take up
to several hours to reset and restart
the compressor.
FU
TH
EC
PTC
C1
9
13.10
9.70
2.54
2.54
1.26
0.84
L1
L2
L3
N
13