Siemens Model 240 Installation Manual download pdf (Page 34)

Installing/Mounting

4.2 Electrical Installation

Power Modules PM240

4-16 Hardware Installation Manual, 2006-04-04, A5E00807525B AA

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:

• The motor must have the appropriate voltage strength.

• 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.

• For the quick commissioning, the rating plate data for the delta circuit configuration

should be entered or the rating plate must be appropriately converted.

• The inverter must be designed for the higher current (delta circuit configuration).

• 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.

• When using the 87 Hz characteristic, the mechanical motor limits must be taken into

account.

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:

NΔ

⋅=

NΔ

⋅=

()

NΔN1

min

+−

⎥

⎦

⎤

⎢

⎣

⎡

N∆

(400 V)

(230 V)

(50 Hz) (87 Hz)

3 /HLVWXQJ

I )UHTXHQ]

Q 'UHK]DKO

S 3ROSDDU1U

Figure 4-14 V/f characteristic

Table 4-3 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 OP, the STARTER commissioning (start-up) program offers a mask-

orientated quick commissioning. On the other hand, the OP offers, in conjunction with the

inverter, parameter-orientated quick commissioning.

1 2 ... 29 30 31 32 33 34 35 36 37 38 39 ... 85 86

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Siemens Model 240 Installation Manual Page 34

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