MicroMaster 6SE92 - ECT Sales & Service

MICROMASTERMICROMASTER VectorMIDIMASTER VectorMotor DataMotor Protection:For MICROMASTER Vector and MIDIMASTER Vector thisis realised using PTC thermistors. The PTC thermistor isconnected at the control terminal strip. If the motor protectionfunction is activated (parameter P087 = 1), the driveconverter is shutdown if a high signal level is present at thePTC input (fault code F004 is displayed).For MICROMASTER this is achieved using a digital input asan external trip signal, together with a PTC and additionalresistor. Please see the operating instructions for furtherdetails.Connecting Motors Through LongerFeeder Cables:Long feeder cables between the motor and drive converter orseveral parallel motor feeder cables (group drives), result inadditional re-charging currents due to the cable capacitance.The drive converters must also supply these additionalcurrents. This can activate the drive converter current limitingand cause the unit to shutdown with an "overcurrent" faultmessage (F002).Further, when fed from PWM drive converters with long motorfeeder cables, voltage spikes at the motor can occur due tovoltage reflections.Depending on the drive converter supply voltage, motor framesize and cable length between the motor and drive converter,output reactors or dV/dt filters are required and/or larger driveconverters must be selected.Further, to reduce the cable capacitance, a higher cablecross-section should be used (for MICROMASTER up to 3kW: 2.5 mm 2 , up to 5.5 kW: 4 mm 2 ; for MIDIMASTER up to5.5 kW: 6 mm 2 , up to 15 kW: 10 mm 2 , for MD 1500/2: 16mm 2 , up to 22 kW, 16 mm 2 , up to 37 kW, 25 mm 2 ).For MICROMASTER, it is generally more favorable to select ahigher-rating drive converter than to use an output reactor ordV/dt filter (see Section 3.7).For cable lengths up to 125 metres, it is sufficient to use thenext largest MICROMASTER or MIDIMASTER; up to 200metres, the next but one largest (i.e. 2 steps higher).The output reactor ordering data is specified inSection 6 - Options. In this case, the maximum permissibleoutput frequency is 120 Hz at a maximum switchingfrequency of 4 kHz.The internal I²t calculation also allows the motor to bethermally monitored. Various motor-output de-rating curvescan be parameterised (P074), which limits the motor currentas a function of the frequency, and provides an alarm (P931 =5; motor overtemperature - MICROMASTERVector/MIDIMASTER Vector only).The "alarm" and "fault" signals can also be output via thebinary outputs.1MJ6 motors include PTC thermistors, which are integratedinto the stator winding. If 1MJ6 motors are to be connected todrive converters, then, just like the 1LA5 and 1LA6 motorshaving the same output, the maximum permissible torquemust be reduced.1MJ6 motors have, as standard, a terminal box with degree ofprotection increased safety "e" (EEx e). Voltage peaks canoccur at the motor when fed from a PWM converter if longmotor feeder cables are used due to voltage reflection. Theterminal boxes, degree of protection EEx e are only permittedfor the following maximum voltage peaks due to the air andcreapage distances:• Up to frame size 225M (660 V terminal boxes) for voltagepeaks up to 1078 V.• From frame size 250M (100 V terminal boxes) for voltagepeaks up to 1633 V.In order that these maximum permissible voltage peaks arenot exceeded at the terminal boxes, the following conditionsshould be observed:230 V supply voltage:When using 1MJ motors (EEx e terminal boxes) norestriction.400 V supply voltage:- Only possible when using the standard 4 kHz switchingfrequency.- Output reactor and flameproof terminal boxes (k53) or:dV/dt filter.460 V to 500 V supply voltage:- Only possible when using the standard 4 kHz switchingfrequency.- dV/dt filter.Operating Motors with Degree ofProtection "d":Siemens 1MJ6 squirrel cage motors can be operated fromthe line supply (direct on-line) as well as from a driveconverter, as explosion-protected motors with flameproofenclosure "d". The flameproof enclosure ensures explosionprotection for the drives. The Physikalisch-TechnischeBundesanstalt (German regulatory body) has issued ageneral certificate of conformance for converter operation ofthese motors. 1MJ6 motors include PTC thermistors, whichare integrated into the stator winding. If 1MJ6 motors are tobe connected to drive converters, then, just like the 1LA5 and1LA6 motors having the same output, the maximumpermissible torque must be reduced.7/2 Siemens DA 64 – 1998/99 (04/99)