motor controll lvl 3 exam

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3. Which basic troubleshooting technique includes four levels of testing?

1. Block diagrams 2. Bracketing 3. Signal flow 4. Signal flow analysis and informational funneling

4. Like the question on the worksheet and quiz, given a 4-20mA output signal, be able to convert to the 1-5 VDC output voltage of the signal transducer.

4-20mA/1-5vdc = (given number)/ (calculated number)= Answer

2. Know the troubleshooting sequence on page 414 in your textbook. You will be asked to properly insert the missing step.

6 Steps pg.414 in textbook

8. How many leads would be typical on a single-voltage DC motor?

6 leads

3. Digital DC drives use ramping to __________ and ____________ a DC motor's speed.

Accelerate and Decelerate

2. When performing maintenance on a DC motor, what are some things that you would be looking to verify?

Access dirt accumulation, burns, damaged start components

7. Which method of reducing arcs in a DC contactor works by forcing the arc up away from the contact after the contact opens?

Blow out

2. Given the formula, be able to convert from Fahrenheit to Celsius.

C=5 x (f-32) / 9 F=32 + (Cx9/5)

1. Know the differences between an open-loop control system and a closed-loop control system. There will be 3 questions/scenarios about these differences between the 2 systems.

Closed loop= Fed back automatically Open loop= No feed back data/ Have a tachometer/ Adjust manually/ Lower cost/ Easier to install

2. _______________ permits all nodes on the network to simultaneously access the same data from a single source.

Control Net

1. Given a control system block diagram, know which line would represent a feedback control path and a convergent or divergent control path

Convergent- 2 categories to 1 category Divergent- 1 category to 2 categories Feedback control- from source -----> back

6. A rheostat starter limits ___________ in a DC motor during starting and accelerating.

Current

9. What else besides a tachometer would be used to monitor shaft speed on a DC motor to provide feedback to the DC motor drive?

Encoder/tachometer

2. Synchronous motors operate at an _______ power factor.

Excellent

3. A _____, sometimes called a multiport repeater, is used to connect different elements of a network together.

HUB

5. The ___________ is a position sensing device, consisting of a special type of transformer with a movable core attached to the item whose position is to be measured.

LVDT

1. Which IEC standard programming language most closely replicates the control diagrams used in traditional magnetic motor control?

Ladder logic

4. What type of device would be used with VFDs to limit the effects of harmonics generated by the VFDs?

Line reactors

1. DC motor contactors generally consist of how many sets of contacts?

One set of contacts

4. What section of a DC drive is the AC-to-DC converter located in? (Power or Control?)

Power

4. At a minimum, the SLC 500 modular hardware consist of?

Processor module/ I/O modules/ Power supply in one chassis

3. When troubleshooting a drive, what usually could be eliminated if the problem arises 6 months down the road?

Programming

3. The ______________ programming software is used with an Allen Bradley SLC Programmable Controller system.

RSLogix 500

1. Review the 4 schematic symbols given in the power point for temperature sensing analog devices. You will be given the symbol and asked to identify.

RTD (circle, horizontal line) THERMOCOUPLERS (Dot with 2 lines) THERMOPILE (circle, vertical line) SOLID STATE TEMP SENSOR ( vertical line, two circles)

2. Generally, programmable logic controllers (PLCs) do not have _______________ like compact disks or fixed storage media like hard disk drives which can be present in a personal computer (PC).

Removable storage media

1. Troubleshooting smart systems is aided by the _______________________ capabilities of the smart devices. This function of the microprocessor provides a valuable tool for troubleshooting the device's operation

Self diagnostics

5. What are the 3 standard DC motor wiring configurations?

Series, shunt, compound

3. Which type of motor must have a position feedback sensor, in addition to the motor itself, to operate properly?

Servo Motor

5. The control setpoints of a VFD establish the ________, _______________, and _________ parameters for the motor.

Speed, rotation and stopping

1. Which type of network topology is configured in such a way that all network devices are connected to a central hub or switch?

Star topology

3. Examples of analog control signals used would include?

Tank levels, dampers, pneumatic values

2. There are 8 factors to consider when installing a drive. Given a list, you will be asked to identify which is not a factor

Temp/ Electrical connection/ Fault protection/ Environment/ Motor protection/ Line power requirements/ Grounding/ Parameters

4. A type of temperature sensor which consists of several thermocouples connected in series would be called?

Thermopile

3. What type of flow sensor requires that particles are present in the fluid in order to work?

Ultra sonic

2. What are the 3 common converters discussed in your textbook used in industrial applications where analog signals drive process and measurement devices? Given a scenario, be able to identify what type would be used.

Volt to current, current to volt, current to pressure

1. What is the slip of a synchronous motor?

Zero

1. What type of device could be used with a 0-10 VDC analog pressure transducer to turn on a single speed mixer motor connected to a magnetic motor starter, when the level of liquid in a tank reaches 80% of the maximum tank level?

signal conditioning device


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