Test 3* Flashcards
1
Q
Types of timers
A
- Pneumatic timer
- Motor-driven timer
- Capacitor timer
- Electronic timer
2
Q
Break before make
A
- A set of contacts that will break the first set of contacts before engaging the new contacts
- This prevents two voltage domains from short-circuiting when switching between two switches
3
Q
Conditions that affect the motor (starting and stopping)
A
- Frequency of starting/stopping
- Light or heavy duty starting
- Fast or slow start (hard or soft)
- Quick stop or slow stop
- Manual or automatic starting and stopping
- Accurate stops
- Frequency of reversals required
4
Q
Motor control installation considerations
A
- Electrical service (voltage, ac or dc)
- Motor
- Operating characteristics of controller
- Environment
- Electrical codes and standards
5
Q
Motor protective features
A
- Overload protection
- Open-field protection
- Open-phase protection
- Reversed-phase protection
- Overtravel protection
- Overspeed protection
- Reversed-current protection
- Mechanical protection
- Short-circuit protection
5
Q
Types of interlocking
A
- Auxillary
- Push button
- Mechanical
