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4.3 Electrical connection
4.3.1 Connection of terminal box of the traction machine
Picture 3 Connection diagram of connection box for traction machine
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In order to ensure that the motor magnet will not be demagnetized permanently due to
overheat, causing damage or performance deterioration of the motor, it is necessary
to connect the PTC detectors to the corresponding control circuits, so that they can
disconnect the power supply in the possible shortest time in case of overheat
occurrence.
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Max. operating voltage of PTC heat detectors should not exceed 25V.
Max. allowable operating temperature of the permanent magnet is 150 ℃ , but
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irreversible loss of magnetic performance will occur at this temperature, which will
have adverse effect on the operation performance of the motor. In order to improve its
reliability, PTC heat detector is set to 120℃.
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The reliable earthing must be provided for the motor in order to ensure its safe
operation.
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In order to prevent the main cables (output cables of the converter) from causing any
electromagnetic radiation and interference to the surrounding environment and
protect the signal transmission cables (cables connecting the encoder with the
frequency converter) from the electromagnetic radiation and interference, the main
cables should be as short as possible and should be the shielded 3-core cables. The
both ends of metal sheath of the shielded cable should twist and then connect to
ground at the same time. The current density of the main cable should not exceed
7A/mm
3-phase windings in the motor have been connected in "Y" connection and three
●
lead-out lines are provided
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In the adjacent 3-phase winding of the motor, there is 3 PTC heat detecting elements
connected with each other in series, and its function temperature is 120 . When
2
, and its line voltage drop should not exceed 0.3V
Electromagnet connects to DC
power supply (+,-)
Wiring of microswitch of
electromagnet inlet(C1,NC1,C2,NC2)
Wiring inlet of PTC heat detector
Entry of power supply cable and
grounding
wire
for
machine (U,V,W)
traction
℃
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