Siemens EK 726 Series Manual de Serviço descarregar pdf (Página 44)

ENGINEERING INFORMATION AND INSTRUCTIONS

MICROMASTER

MICROMASTER Vector

MIDIMASTER Vector

SIEMENS DA 64 – 2002/2003

Version D 3/20

When selecting the output reactors, the max. output

frequency and the max. pulse frequency should be taken into

account.

It is not possible to use sinusoidal or dv/dt filters from the

MASTERDRIVE 6SE70... series for applications with

MICROMASTER / MIDIMASTER. The reasons are technical

ones (the filters are matched to the pulse frequency and

modulation of the MASTERDRIVE series).

PTC thermistors and tripping units are specified for 1MJ

motors. More detailed information is provided in Catalog NS

2 under the Info "Operating explosion-protective motors with

AC drive inverters" ID: 4886577

Drive inverter & motor assignment

The selection parameters for 2, 4, 6 and 8-pole squirrel-cage

motors are essentially the voltage and current. However,

instead of the current, the rated motor power can be used.

For safety reasons, when engineering the drive, it should be

noted (especially for third-party motors), that the rated drive

inverter output current is dimensioned to be approx. 10%

higher than the rated motor current (I

inverter rated

³ 1.1 * I

motor

rated

). Furthermore, it is assumed that the motors are used in

accordance with temperature rise Class F and continuous

duty S1

The (motor) output P

Catalog

, specified in the Catalogs, refers

to the rated speed

of the particular motor. The permissible

S1 torque in the associated speed range (for constant torque

applications) and at the associated speed operating point (for

blower and pump applications) can be determined as follows:

Nmin

Cata

epermissibl

9550

log

Catalog

: Shaft output in kW at n

: Motor rated speed in RPM

The last position of the motor Order No. listed in Catalog

M11 (shown as ".") signifies the type of construction.

The motor rated current is greater than the rated

drive inverter current

A "larger" motor (current, voltage, power) should never be

operated together with a smaller drive inverter. There may be

some exceptions:

Motors in the partial load range

Motors for pump and fan applications (VT).

Motors in the partial load mode

Generally, we recommend that this operating mode is not

used!

If the drive inverter is to be connected to a larger motor than

that specified in the assignment table, e.g. the drive is only

operated in the partial load range, then the following limits

and restrictions should be carefully observed:

The maximum drive inverter current (short-time current P086

& P186) should be greater than or at least the same as the

rated motor current or, if applicable, the same as the sum of

the rated currents of the connected motors (for multi-motor

drives). Otherwise, peak currents which could occur, would

trip the drive (shutdown) due to an overcurrent condition.

This is because the leakage inductance and therefore the

current ripple are higher for larger motors. Under no

circumstances may the Vector control type be selected (the

V/Hz control type with the factory set motor parameters

should be selected). The pulse frequency should be set as

low as possible.

Blower and pump drives with 1LA5, 1LA6 and 1LA7

motors: ("Variable torque", VT)

Blower (fan) and pump drives with a load characteristic M ~

(VT) only require the full torque at the rated speed.

Generally, increased starting torques are not expected due to

load surges. This is the reason that the drive inverter does

not require an overload capability.

For fan and pump drives, the motor and drive inverter should

be matched so that the max. motor current at full torque and

at the rated operating point corresponds to the drive inverter

continuous current.

The favorable pulse pattern permits, in almost all cases, the

same output at the rated operating point as for direct online

operation (where the motor is directly connected to the line

supply). Motors must be used so that they comply with

temperature rise Class F.

"Variable torque", VT

For fan and pump drives, for each

specified motor output,

the next smaller MIDIMASTER Vector can be used. The

prerequisite is that the square-law V/Hz characteristic (P077

= 2) is selected and the lowest possible pulse frequency

(P076 = 6=2KHZ). With this setting, a significantly higher

continuous output current at the MIDIMASTER Vector is

possible, so that in most cases, the rated power for the next

larger motor is reached. However, the overload capability of

the drive inverter is max 110% as a result of this measure.

1) Except MDV4500/2; MDV110/2; MDV750/3

1 2 ... 39 40 41 42 43 44 45 46 47 48 49 ... 119 120

Comentários a estes Manuais

Sem comentários

Siemens EK 726 Series Manual de Serviço Página 44

Comentários a estes Manuais

Manuais e produtos relacionados com Fogões Siemens EK 726 Series