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In this video you can see how to operate abb dc drive in local mode, how to check field voltage, field resistance, how to check field current and others.
DCS800 DC Drive Promises The drive meets the requirements of the most demanding drive applications. Embedded software functions offer upgrades to all classic installations like 12-pulse, double motor operation, and field reversal.
What is the function of DCS800?
The DCS800 provides an internal PLC function with adapt the drive to demanding applications like cranes and winders. To archive higher field currents external field exciter, must be used. External field exciters with field currents up to 520 ADC are available.
What are the components of a DC drive?
In order to realize how a DC drive has the capability to provide the above characteristics, the DC drive has to be analyzed as two elements that make up the package. These two elements are of course the motor and the control.
What is DC drive and how does it work?
A type of electric drive which is employed for controlling the speed of a DC motor is known as DC drive. The DC drive converts the input AC supply to the DC supply output using the rectifier circuit to control the speed of the DC motors. The DC drives are of two types viz.: analog DC drive and digital DC drive.
Checking Relative Polarity of DC Motor Fields:-
1. Connect a low scale (3 volt) DC voltmeter across the shunt field terminals (F1, F2) with F1 connected to the positive (+) terminal of the meter. At least one of the shunt field leads must be disconnected from the controller.
2. Use two flashlight batteries as a source of low voltage (3 volts). Hold or connect the negative, to contact the S-2 series field terminal. Hold one end of a wire conductor to the positive (+) center terminal so that the
other end of the wire can be used to make and break contact with the S-I series field terminal.
3. Watch the deflection of the voltmeter needle when contact is made with S-I and when contact is broken.
4. When contact is made, the needle will first deflect in either the up scale or down scale direction and then return to zero. Deflection will be in the opposite direction when contact is broken.
5. Relative polarities of the shunt and series fields are correct (ampere-turns are cumulative) if the voltmeter needle deflects up scale when contact is made and down scale when contact is broken.
6. Relative polarities of the shunt and series fields are incorrect (ampere-turns are differential) if the voltmeter needle deflects down scale when contact is made and up scale when contact is broken. The motor connections must be changed so that relative polarity is correct. Relative polarity can be incorrect because of an error in the connections to the control or because the series fields leads are improperly marked. In any case, the motor connections must be changed so that relative polarity is
correct.
If only one series field terminal is available at the controller, use it and the available armature terminal for the test. For example, use S-2 and A-l, if S-1 and A-2 arc connected together at the motor and not brought to the
controller.
If you have an oscilloscope, you can use it in place of an analog meter. I have done the same test procedure using a 9v battery and my scope. This procedure also works to determine armature wires that are not labeled. Typically A1 lead will tie directly to one of the brush racks and the A2 lead will come from a special winding which is tied in series to the opposing brush rack of A1. This special winding is called an interpole.
It is very important that S2 and F2 are always tied to the negative outputs of the controller. If the motor is running the wrong direction, swap armature leads.
If the motor controller (DC drive) is regenerative then tie S1 and S2 together or tape off each lead separately and don't use them at all. A good example of a typical DC motor connection
In this video you can know about voltage and current measurements one by one increase through percentage and how to operate dc drive by abb dcs 800 and operate to dc motor.
In this video you can test to dc motor also.
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3 сен 2023
