Motor frequency conversion starting cabinet
1. Start parameters ◦ Start time: can be adjusted in the range of
3-60 seconds, according to the power of the motor, load
characteristics and system requirements, select the appropriate
start time to ensure smooth motor start. ◦ Starting torque:
Generally can be adjusted in the range of 50%-200% rated torque,
for the motor started with load, it is necessary to set a higher
starting torque to overcome the static friction and inertial force
of the load. ◦ Acceleration time: Usually between 5-120 seconds,
too short acceleration time may lead to a large impact on the motor
and equipment, and too long acceleration time will affect
production efficiency. 2. Motor adaptation parameters ◦ Suitable
motor power: from a few kilowatts to hundreds of kilowatts or even
higher, choose the right starting cabinet according to the power
size of the motor in the actual application to ensure that the
starting cabinet can provide enough power and protection for the
motor. ◦ Number of motor poles: Common 2 poles, 4 poles, 6 poles, 8
poles, etc. Motors with different poles have different speed and
torque characteristics, and the starting cabinet needs to be set
and matched according to the number of motor poles. 3. Protect
parameters ◦ Overcurrent protection setting value: Generally set to
1.2-1.5 times the rated current of the motor, when the motor
current exceeds this value, the starting cabinet will cut off the
power for a certain period of time to protect the motor and the
line. ◦ Overheat protection operating temperature: For motor
windings and power devices, etc., the overheat protection operating
temperature is usually set between 130 ° C and 150 ° C. When the
temperature exceeds this value, the starting cabinet will stop
running. ◦ Undervoltage protection action value: Generally set to
70%-85% of the rated voltage. When the power supply voltage is
lower than this value, the starting cabinet will trigger the
undervoltage protection to prevent the motor from being damaged due
to too low voltage. 4. Other parameters
Input parameter
◦ Rated voltage: 380V, 400V, 690V, etc. Different application
scenarios and power systems choose different rated voltage levels.
◦ Rated frequency: Generally 50Hz or 60Hz, which is determined
according to the frequency of the power grid in the region. ◦ Input
current: refers to the maximum current that the control cabinet can
withstand from the power side, depending on the power of the
controlled motor and the load of the system, ranging from tens of
amps to thousands of amps. 2. Output parameters ◦ Output voltage
range: It can usually be adjusted in the range of 0V to similar to
the input voltage, such as in the 380V system, the output voltage
can be changed between 0-380V to meet the voltage requirements of
different motor speed regulation. ◦ Output frequency range:
Generally 0-400Hz or wider, the low frequency band can be used for
the low speed operation of the motor, and the high frequency band
can make the motor run higher than the rated speed to meet special
process requirements. ◦ Output current: matched with the rated
current of the driven motor, it should be able to meet the load
current requirements of the motor in various working conditions,
and has a certain overload capacity, which can generally reach
1.2-1.5 times the rated current. 3. Control accuracy ◦ Frequency
accuracy: usually can reach ± 0.01%-± 0.1%, that is, the error
between the actual output frequency and the set frequency is within
a small range, to ensure the precise control of the motor speed. ◦
Voltage accuracy: Generally ±1% - ±5% to ensure the stability of
the output voltage to protect the motor and other equipment from
voltage fluctuations. 4. Other parameters ◦ Protection level: such
as IP20, IP42, IP54, etc. IP54 indicates that the dust protection
level is 5, preventing most of the ash
50Hz Active Filter Power Distribution Cabinet 0.4kv Low Voltage Cabinet
