Chapter 6&7 Flashcards
Control transformers generally have screw terminals connected to the _____ and _____
Primary, Secondary Leads
What is a control transformer used for?
To step down the voltage from 480 to 120
What voltages do most industrial motors operate on?
240 or 480 volts
On control transformers, the _____ to make connection to the primary winding easier
The primary leads are crossed
What determines how the primary side of the transformer is configured?
The voltage supplied
What are the Secondary windings of a control transformer labeled as?
X1 and X2
What are the Primary windings of a control transformer labeled as?
H1, H2, H3, and H4
What are the two primary windings rated for?
240 volts
If 240 volts are supplied would the primary windings be connected in series or parallel?
Parallel
If 480 volts are supplied would the primary windings be connected in series or parallel?
Series
How can the primary windings be changed between series and parallel?
Using the metal link between H2 and H3
How is fuze size calculated?
using the formula I=VA/E
Fuze= volt-amperes/ voltage of primary side
round to nearest whole number
What is the purpose of the primary fuze?
To protect the secondary winding
What is the operating voltage for most magnetic control circuits?
120 volts
Timer relays are similar to control relays because they use _____ to control the operation of contacts
Coils
