NORD Drivesystems BU0180 - Manual (Page 174)

SK 180E Manual for frequency inverters
174 Pre-series version BU 0180 GB-0914
9.8.2 87Hz characteristic curve (only 400 V devices)
( Variation 01:17:00)
The 87 Hz characteristic represents an extension of
the speed adjustment range with a constant motor
nominal torque. The following points must be met for
realisation:

Motor delta connection with a motor winding
for 230/400 V

Frequency inverter with an operating voltage
3~400 V

Output current of frequency inverter must be
greater than the delta current of the motor used
(ref. value  frequency inverter power
 
3 x
motor power)
In this configuration, the motor used has a rated operating point at 230 V/5 0Hz and an extended operating
point at 400 V/ 87Hz. This increases the power of the drive by the factor

3. The nominal torque of the
motor remains constant up to a frequency of 87 Hz. Operation of a 230 V winding with 400 V is totally
uncritical as the insulation is designed for test voltages of > 1000 V.
The following data refer to a 230/400 V motor winding. They apply for IE1 or IE2 motors. It should be noted that
these details may deviate slightly, as motors are subject to certain manufacturing tolerances. It is recommended
that the resistance of the connected motor is measured by the frequency inverter (P208 / P220).
Frequency inverter type
Parameterisation data of frequency inverter
F
N
[Hz] n
N
[min
-1
] I
N
[A] U
N
[V] P
N
[kW] cos
 Circuit
R
St
[

]
IE1 Motors
SK…63S/4 SK 1x0E-250-340-B 50 1335 0.95 230 0.12 0.64 Delta 68.00
SK…63L/4 SK 1x0E-370-340-B 50 1360 1.18 230 0.18 0.64 Delta 47.37
SK…71S/4 SK 1x0E-550-340-B 50 1365 1.30 230 0.25 0.79 Delta 39.90
SK…71L/4 SK 1x0E-750-340-B 50 1380 1.89 230 0.37 0.71 Delta 22.85
SK…80S/4 SK 1x0E-111-340-B 50 1385 2.62 230 0.55 0.75 Delta 15.79
SK…80L/4 SK 1x0E-151-340-B 50 1395 3.52 230 0.75 0.75 Delta 10.49
SK…90S/4 SK 1x0E-221-340-B 50 1410 4.78 230 1.1 0.76 Delta 6.41
IE2 Motor
SK…80SH/4 TI 4 - SK 1x0E-110-340-B 50 1415 2.39 230 0.55 0.70 Delta 9.34
SK…80LH/4 TI 4 - SK 1x0E-151-340-B 50 1410 3.12 230 0.75 0.75 Delta 6.30
SK…90SH/4 TI 4 - SK 1x0E-221-340-B 50 1430 4.26 230 1.1 0.80 Delta 4.96
Frequency inverter type
Performance data at rated point*
P
B
[kW] n
B
[min
-1
] M
B
[Nm]
SK…63S/4 SK 1x0E-250-340-B 0.21 2430 0.80
SK…63L/4 SK 1x0E-370-340-B 0.31 2455 1.20
SK…71S/4 SK 1x0E-550-340-B 0.43 2460 1.65
SK…71L/4 SK 1x0E-750-340-B 0.64 2475 2.49
SK…80S(H)/4 SK 1x0E-111-340-B 0.95 2480 (2510) 3.67 (3.6)
SK…80L(H)/4 SK 1x0E-151-340-B 1.3 2490 (2505) 5.01 (4.9)
SK…90S(H)/4 SK 1x0E-221-340-B 1.9 2505 (2525) 7.32 (7.2)
* Values in brackets apply for IE2 motors
87 Hz characteristic curve (4-pole motor)
0
0,2
0,4
0,6
0,8
1
1,2
0 10 20 30 40 50 60 70 80 90 100
Frequenz / Hz
M/Mn
M/M
N
P/P
N
0
1445 2890
Frequency
[Hz]
Speed
[1/min]