PAGE 142 Flashcards
What is the significance of the supply voltage available?
It determines which type of drive motor can be used
Three-phase motors are more efficient and smaller for the same output.
What factors are included in protection required for an installation?
Protection devices, condition monitoring, feedback units
These are necessary when the drive is some distance from the main control circuit.
How is the overload relay set for single-phase motors?
At full-load current when the motor is on full load
How is the overload setting determined for three-phase motors?
According to the method used for connecting the motor in the main circuit
When the overload is connected to take only the phase current, how is it set?
Full load current multiplied by 0.58
Formula: Tor = Ip × 0.58
What control methods must be considered for motor control?
Control speed, start with reduced voltage, start sequentially
What information determines the number of contactors or relays needed?
The type of control required
What safety requirements should be considered before selecting the drive control?
Flameproof control circuit and equipment to prevent sparking
