DSAI133A 3BSE018290R1 CPU module PLC controller
Brand ABB color standard Application Industrial height 216mm rated current 258mA
Protection Level IP45 Suitable for motor power 359KW Applicable Site Power Industry Material Code GJR2391500R1220 Power industry HIEE401782R0001 Part Number DSAI133A 3BSE018290R1
Applicable pipe 2 Whether imported is weighing 4.88 kg can be sold nationwide
DSAI133A 3BSE018290R1 CPU module PLC controller
SAI133A 3BSE018290R1 When the output frequency of the Variable frequency governor (also known as the inverter, the English abbreviation is VFD(variable-frequency Drive)) VFD is 0, the motor cannot start because the motor does not have enough starting torque. Only when the output frequency of the VFD reaches a certain value, the motor starts to accelerate, and the output frequency of the VFD is the starting frequency fs. At this time, the starting current is larger and the starting torque is larger. The setting of the starting frequency is to ensure that the motor has enough starting torque when starting, to prevent the motor from failing to start or causing overcurrent tripping during the starting process. In general, the starting frequency should be set according to the characteristics of the load driven by the VFD. On the one hand, the low frequency underexcitation area should be avoided to ensure that the motor has enough starting torque; On the other hand, the starting frequency can not be set too high, otherwise it may cause large current impact when the motor starts, and even overcurrent tripping. The starting frequency depends on the specific load.
How to determine the startup frequency?
In general, most motors accelerate from 0Hz, but in some special cases, it is necessary to accelerate directly from a certain frequency. At this time, the frequency output by the VFD at the start moment is the start frequency. In general, you need to set the startup frequency in the following cases.
1. Multiple water pumps supply water at the same time
DSAI133A 3BSE018290R1 For a system that uses multiple pumps to supply water at the same time, because there is usually a certain water pressure in the water supply pipeline, if it is started at 0Hz, the pump is difficult to start. In this case, you need to start directly from a certain frequency in order to start the rotation smoothly.
2. Load
If the VFD is driven by the load, the static friction is large, and it is difficult to start from 0Hz. In this case, it is necessary to set the starting frequency to ensure that a certain starting impact force is generated at the start moment to make the system start smoothly.
3. Cone motor
In the process of starting, there will be friction between the stator and the rotor, so it is also necessary to set the starting frequency to ensure that enough magnetic flux is quickly established at the start of the moment, so that a certain air gap is maintained between the stator and the rotor, so that the motor can be started smoothly.
DSAI133A 3BSE018290R1 VFD starting frequency setting method
(1) Constant torque load. Generally, the synchronous speed of the motor should not exceed the rated slip rate. To wit:
Where P is the number of poles of the motor; △n — rated slip, △n = n1-ne; N1- synchronization speed; ne- rated speed; (1) Square torque load. Since the square wave torque load has a small resistance moment at low speed, the starting frequency can be appropriately increased.
In practical application, the starting frequency should be set reasonably to solve the problem of motor starting difficulty and overcurrent tripping. For the motor with large starting torque, it is necessary to first consider setting the appropriate starting frequency parameters, and then set a reasonable torque lifting curve according to the actual load. If the VFD current is too high when starting, or even overcurrent tripping, it can be solved by extending the acceleration time. But in general, as long as there is no excessive flow, the speed up time is as short as possible to improve efficiency.
DSAI133A 3BSE018290R1 CPU module PLC controller
ABB 5SDF0860H0003
ABB 5SGY3545L0003
ABB 5SGY3545L0017
ABB 5SHX06F6004
ABB 5SHX1060H0003
ABB 5SHX10H6004
ABB 5SHX14H4502
ABB 5SHY3545L0003
ABB 5SHY3545L0005
ABB 5SHY35L4510
ABB 5SHY35L4520
ABB AI845
ABB AI880-1
ABB AO845A
ABB AO845A-eA
ABB ARC093AV1
ABB ARCOL 0338
ABB ARCOL 0339
ABB ARCOL 0346
ABB BC25
ABB BRC300
ABB C310/0020/STD
