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TECHNICAL DESCRIPTION

MICROMASTER

MICROMASTER Vector

MIDIMASTER Vector

SIEMENS DA 64 – 2002/2003

Version D 2/8

2.3 Shutting down (stopping) a motor

A drive can be shutdown in several ways:

· Selecting OFF 1

(P051 to P055 or P356 = 1 or 2), this means that when

the ON command is reset, the drive inverter is

shutdown with the ramp-down time selected in P003.

· Selecting OFF 2

(P051 to P055 or P356 = 4) means that the inverter is

inhibited and the motor coasts down.

· Selecting OFF 3

(P051 to P055 or P356 = 5) means that the motor is

quickly braked. The motor is braked as quickly as

possible along the drive inverter current limit.

In addition to the three OFF commands, there are four

additional braking versions available.

· Selecting an external brake

via the control relay outputs (P061 / P062 = 4)

· Selecting DC current braking

means that the drive is quickly braked to standstill.

The DC current braking is activated using P073 with a

value greater than 0 and up to 200% (referred to P083).

This corresponds to approx. 30 - 40 % of the

regenerative braking. DC current braking is selected

using OFF 1 or externally via DIN 1 - DIN 6 (P051 -

P055 and P356 = 15). However, there is no defined

motor stop, as the brake is effective for the time,

parameterized in P003 and at a level, parameterized in

P073. Correspondingly, if the DC current brake is

activated using DIN1 - DIN6, it is activated as long as

there is a (HIGH) signal. The energy generated while

braking is discharged through the motor.

· Selecting COMPOUND BRAKING™

is an effective method of stopping the motor in a

controlled fashion without the need for an external

braking resistor. The inverter controls this by impressing

a controlled amount of DC current into the motor

windings during ramp-down using a new software

modulation technique. COMPOUND BRAKING™ is

most effective at lower outputs where motor efficiencies

are their lowest. The compound brake is activated by

the magnitude of the braking current in P066 (greater 0

to 250%; referred to P083), and corresponds

approximately to 50 - 60 % of the effect of regenerative

braking. The energy generated is also discharged

through the motor. Compound braking is always

selected with the down ramp, i.e. as soon as a higher

setpoint change is made with respect to f = 0 or with

OFF 2 and OFF 3.

· The regenerative braking

causes the motor to be quickly braked and in a

controlled fashion. The energy fed back into the DC link

is converted into thermal energy by the motor using the

integrated braking chopper (P070 / P075) and an

external braking resistor for MICROMASTER Vector or

using the external brake module (EBU) and external

braking resistor options for MIDIMASTER Vector.

Comments:

It is not possible to combine the various braking

versions.

If OFF 2 or OFF 3 is selected, the ON command (OFF

1) must be reset, as otherwise the drive inverter would

go into the power-on inhibit condition if it was to be

powered-up again.

If compound braking is frequently used, this results in

a high motor temperature.

2.4 Emergency Off

General information

The following stop function categories are defined in

accordance with VDE 0113:

Category 0 Uncontrolled shutdown by immediately

disconnecting the power feed (the motor

coasts down).

Category 1 Controlled shutdown, whereby the power

remains connected in order to shutdown

the drive. The power feed is only

disconnected when the drive has come to a

standstill.

Category 2 Controlled shutdown, whereby the power

remains connected even after the drive has

come to a standstill.

For MICROMASTER, MICROMASTER Vector and

MIDIMASTER Vector, only Category 0 can be achieved

without using any external measures.

2.4.1 Safe standstill

This function has not been implemented in the

MICROMASTER, MICROMASTER Vector and

MIDIMASTER Vector.

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Siemens EK 726 Series Manual de servicio Pagina 22

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