87 hz characteristic – Watson-Marlow MM440 User Manual
Page 82
3 Functions
Issue 10/06
MICROMASTER 440 Operating Instructions
82
6SE6400-5AW00-0BP0
87 Hz characteristic
When a motor with a delta circuit configuration (e. g. V
N
∆, motor
= 230 V) is fed from a
frequency inverter, where the rated voltage corresponds to the star circuit
configuration (e.g. 400 V frequency inverter), then it is important to proceed as
follows and observe the following:
¾
The motor must have the appropriate voltage strength.
¾
Above the rated motor frequency, the iron losses in the motor increase over-
proportionally. This is the reason that above this frequency, the thermal motor
torque should be reduced.
¾
For the quick commissioning, the rating plate data for the delta circuit
configuration should be entered or the rating plate must be appropriately
converted.
¾
The drive inverter must be designed for the higher current (delta circuit
configuration).
¾
The 87 Hz characteristic is independent of the control type and can therefore be
used both for V/f control as well as for closed-loop vector control.
¾
When using the 87 Hz characteristic, the mechanical motor limits must be taken
into account (refer to Catalog M11).
For the 87 Hz characteristic, the ratio between the voltage and frequency (V/f
characteristic) remain constant. This is the reason that the following relationships
apply:
P = power
P
U
U
P
N∆
N∆
N1
N1
⋅
=
f
U
U
f
N∆
N∆
N1
N1
⋅
=
(
)
n
f
f
n
∆
N∆
N1
N1
p
min
s
60
+
−
⎥
⎦
⎤
⎢
⎣
⎡
=
f
f
N1
f
N
∆
U
U
N
∆
U
N1
f = frequency
n = speed
p = pole pair No.
(400 V)
(230 V)
(50 Hz)
(87 Hz)
Fig. 3-25
V/f characteristic
Table 3-8
Example 1LA7060-4AB10
Delta
circuit
configuration
87 Hz
characteristic
Star circuit
configuration
P0304
Rated motor voltage
230 V
400 V
400 V
P0305
Rated motor current
0.73 A
0.73 A
0.42 A
P0307
Rated motor power
120 W
207 W
120 W
P0308
Cos
ϕ
0.75 0.75 0.75
P0310
Rated motor frequency
50 Hz
87 Hz
50 Hz
P0311
Rated motor speed
1350 RPM
2460 RPM
1350 RPM
P0314
Motor pole pairs
2
2
2
Contrary to the BOP, AOP operator panels or the commissioning program Drive-
Monitor, the STARTER commissioning (start-up) program offers a mask-orientated
quick commissioning, which is especially advantageous for users who are using
MICROMASTER for the first time. On the other hand, BOP, AOP and DriveMonitor
offer, in conjunction with the drive inverter, parameter-orientated quick commissio-
ning where the user is navigated through the menu tree mentioned.