Machines; Diagram Conversion

Question 1

Pros and cons of wiring diagrams

Answer 1

Pros:

• illustrate physical location
• helpful when making connections

Cons:
- not good for understanding electrical sequence, function, or logic of the cct.

Question 2

5 steps to convert wiring diagram to schematic:

Answer 2

• Identify all contactors and relays
• Identify contacts with their relays and contractors.
• label pilot devices
• differentiate conductors
• copy identifiers onto the schematic

Question 3

What do the following NEMA acronyms mean?
M(1)
R(1)
CR
OL
AR
TR(1)
L(1)
T(1)
F
R

Answer 3

Magnetic motor starter contactor 1
Relay number 1
Control relay
Overload device
Alternating relay
Timing relay number 1
Line 1 of power source
Motor terminal 1
Forward
Reverse

Question 4

What do the following IEC acronyms mean?
K
KM
K1T
F
S
Q

Answer 4

Relay
Magnetic motor starter contactor
Timing relay number 1
Overload device
Switch
Power load interrupting device; fused or non fused disconnect or circuit breaker.

Question 5

When labeling a conductor, the label applies to all portions or branches of the conductor. When does the label change?

Answer 5

When the conductor is separated from the circuit by a device.

Question 6

What are some examples of load devices?

Answer 6

Coils, pilot lights

Question 7

What are some examples of operating devices?

Answer 7

Contacts and switches

Question 8

Where are load devices with respect to operating devices on a schematic?

Answer 8

Load devices are on the right, operating devices are on the left.

Question 9

In a situation with 2 stop stations in series, which should you bring the wire to first to minimize on total conductor length?

Answer 9

The closest one.