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Figure 4-2 Three-phase electrical wiring diagram of Y/
*For star-delta motors, the start-up time of star (closing contactors K1 and K3) should not
exceed 1.5 seconds (0.8~1 second recommended); on the other hand, when switching to delta
operation (closing contactors K1 and K2) ), when the K3 contactor is disconnected, the K2
contactor must be closed within a delay of 35~50 milliseconds:
*For partial winding motors, within 1 second of closing the start contactor K1 (0.6 seconds
recommended), then close the running contactor K2
4.2 protective device
4.2.1 Motor thermistor
There are 6 PTC thermistors linked in series buried in the motor windings to prevent the
motor from burning out due to high temperature. The three thermistors are set at the suction
end of the motor, and the cut-off temperature is 100°C, and the other three are set at the other
end of the motor, and the cut-off temperature is 120°C.
The cold resistance value of the thermistor chain (below 40°C) must be less than 1800Ω:
if any one of the thermistors reaches the critical temperature, the resistance value of the
resistance chain increases exponentially, and the electronic protection module SE-E will action,
cut off the power supply. The resistance value can be measured between the T1 and T2
terminals located on the terminal block.
Note: When measuring the resistance of the thermistor, the measurement voltage
should not be higher than 3V.
4.2.2 protection module
The protection module INT 69 is supplied as a standard accessory with the following
△
motor
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