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Connections
What is ampacity? What is the connection between the ampacity and the wire AWG?
The amount of current carrying ability of the wire with respect to its diameter. For example: If you have a thinner cable you can’t transfer so much current. If you have a larger cable diameter you can transfer more current. When the AWG is high the ampacity is low, and when the AWG is low the ampacity is high.
True or false? – For the PE (Protective Earth) the AWG should be as high as possible.
False
What is recommended regarding the motor – drive power connection cables?
They should be as wide as possible (low AWG), not twisted but shielded. Ground the outside of the motor.
In which drives must we usually use an isolated transformer? Why do we need the isolated transformer?
Low DC voltage drives (less than 200 VDC). The isolated transformer provides isolation between the logic and the power stages of the drive.
What is recommended regarding the main power supply and the drive cable connection?
Twisted and shielded cable. In case of using isolation the PE should be shorted to the power supply PR. In case of DC offline drives (when an isolated transformer is not essential, PE should not be shorted with the PR of the PS.
What would you do in a situation where the cables between the main PS and drive are very long?
Add capacitance; make the wires as wide as possible. This is in order to prevent high voltage drops across the cable edges.
What is the purpose of the auxiliary power supply? Where would you connect the PE to?
It is for the logic in the event of power loss to the driver. The PE is connected to ground via the PR.
What is the maximum current that the internal 5V encoder/halls supply can apply to the encoder/hall device?
200 mA
Why do we use differential encoder signal inputs?
To reduce the noise level and obtain a better signal integrity.
What is the maximum encoder frequency?
20 MHz.
What is the maximum differential analog input voltage that is allowed?
±10 VDC
What is the resolution of the analog input? How do we achieve that with 12 bit ADC?
14 bit. We oversample the 12 bit ADC to reach 14bit resolution.
What is the minimum required voltage to operate the optic isolated digital input? What is the maximum current allowed in this input device?
5 V or 24 V depending on the device.
20 mA
What is the minimum required voltage to operate the optic isolated digital output?
5 V
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