Siemens EK 726 Series Wartungshandbuch PDF herunterladen (Seite 43)

ENGINEERING INFORMATION AND INSTRUCTIONS

MICROMASTER

MICROMASTER Vector

MIDIMASTER Vector

SIEMENS DA 64 – 2002/2003

3/19 Version D

Motor protection:

MICROMASTER Vector and MIDIMASTER Vector:

The motors are protected using a PTC thermistor. This is

connected to the drive inverter control terminals. The motor

protection function is activated using the parameter P087 =

1; for a motor fault ("Low signal" at the control input), error

code F004 is displayed.

For

MICROMASTER, this is realized using a digital input as

external trip signal in conjunction with a PTC thermistor and

an additional resistor. Please refer to the Operating

Instructions for further details.

Another possibility of thermally monitoring the motor is the

internal

I²t calculation (parameter P074) of the drive

inverter. In this case, various de-rating characteristics can be

parameterized corresponding to the motor output, whereby

the motor current is limited as a function of the frequency and

an alarm (W005) or a fault message (F074) is initiated.

"Alarm" and "Fault signals" can be output via the digital

outputs, the last fault can be read-out using parameter P930

= and the last alarm using parameter P931, or displayed on

the OPM2 plain text operator panel.

Long cables between the drive inverter and motor:

25m shielded and 50m non-shielded cables are used as

standard cable lengths between the drive inverter and motor,

both for the MICROMASTER as well as for the

MIDIMASTER series.

Long cables (shielded > 50m, non-shielded > 100m) between

the motor and drive inverter or several cables routed in

parallel (group drives) result in re-charging currents due to

the cable capacitance and voltage spikes due to voltage

reflections. This means, that depending on the drive inverter

line voltage, the motor frame size and cable lengths between

the motor and drive inverter, output reactors and / or DV/d

filters may be required.

The drive inverter must also cover these additional currents

which can mean that the current limiting of the drive inverter

is activated and / or the drive unit is tripped with an

"Overcurrent fault signal" (F002). It can also cause the vector

control (P077 = 3) to behave incorrectly. This can be

resolved by using the next largest drive inverter and / or a

higher cable cross-section. Generally, for MICROMASTER, it

is more favorable to select a drive inverter with a higher rated

output than using an output reactor or a DV/d

t filter.

The ordering data for output reactors is specified in the

Section, Options. When using output reactors, the

maximum permissible output and pulse frequency must be

observed.

Information and instructions on using

motors with type of protection " EEx de or

EEx d " when connected to drive inverters:

Siemens 1MJ6 squirrel-cage induction motors can be

connected directly to the line supply voltage or can be fed

from a drive inverter as explosion-protected motors with

flameproof enclosure, type of protection "EEx de or EEx d".

The flameproof enclosure guarantees explosion protection

for drives, whereby the terminal boxes, with degree of

protection EEx e, are normally designed for a 690 V rated

voltage. When variable-speed drives are used in hazardous

zones, we recommend that 1MJ6 and 1MJ8 squirrel-cage

induction motors are used with flameproof enclosure.

Siemens has a general certificate of conformity for these

motors, also when they are fed from drive inverters. When

using drive inverters with EEx d motors from other

manufacturers, it is necessary to have this general certificate

of conformity confirmed by the particular motor manufacturer.

Up until now, the Physikalisch-Technische Bundesanstalt

(PTB – a German regulatory body) specified, that the peak

voltages, occurring when motors are fed from drive inverters,

do not exceed 1078V in the Eex e terminal boxes (this is

certified for line supply voltage up to 690V). Recent

investigations carried-out by the PTB regarding the air and

creepage distances, has resulted in the fact that also higher

voltage spikes are permissible in the terminal box when the

motors are fed from drive inverters. This means that now

voltage spikes up to

1952 V (690 x Ö2 x 2) are permissible

for these terminal boxes. Voltage spikes can occur at the

motor due to voltage reflections and because it is especially

critical that the permissible voltage spikes in the motor

terminal box are not exceeded in hazardous environments,

the following measures are required.

· The pulse frequency must be limited to 4KHz

(P076)

· Voltage reflections must be reduced

(these voltage reflections can be reduced using output

reactors and / or dv/dt filters.)

Supplementary measures for operating 1MJ6 and

1MJ8 motors in hazardous environments

Line supply voltages, 208 V to 240 V ± 10 %

No additional measures required

Line supply voltages, 380 V to 400 V

± 10 %

1MJ6 070 to 1MJ6 313

No additional measures required

1MJ6 070 to 1MJ6 166

No additional measures required

1MJ6 183 to 1MJ6 313

1MJ8 313 to 1MJ8 457

Insulated non-drive end bearings are required, option: L27

(Loher)

Line supply voltage

440 V to 460 V

± 10 % and 500 V ± 10 %

1MJ8 313 to 1MJ8 457

Insulated non-drive end bearings are required, option: L2

Notes:

1 2 ... 38 39 40 41 42 43 44 45 46 47 48 ... 119 120

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