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2nd Period Electrican > Motor control > Flashcards

Motor control Flashcards

1
Q

relays

A

electromagnetic switches control a load

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2
Q

plug in relays

A

general purpose
wire terminal basee
control circuits
10 - 15 amps

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3
Q

induistrial control relays

A

heavy duty
switching control circuits
bridge contacts to reduce arcing that pits and weld
adder decks to increase contacts

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4
Q

power relays

A

direct switching of small motors and heating
not subjected to high cycle rates
30 amps
2hp

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5
Q

low voltage lighting relays

A

lighting systems
less than 30 V
single pole contacts

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6
Q

contactors

A

electromagnetic operated switches for high current
overload protection is seperate

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7
Q

NEMA

A

general purpose
simple
limited

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8
Q

IEC

A

design for life cycle
smaller size

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8
Q

reversing contactors

A

2 non reversing contactors with a mechanical and electromagnetic interlock

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9
Q

mechanically interlocked contactor

A

2 contactors with mechanical interlock

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10
Q

mechanically held contactors

A

latch in
large lighting
reduce power consumption
2 coils one energizes, one deenergizes

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11
Q

definite purpose contactor

A

HVAC
auto thermostat

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12
Q

FORM A

A

SPST NO

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13
Q

FORM B

A

SPST NC

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14
Q

FORM C

A

SPDT

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15
Q

FORM X

A

SPST NO DM

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16
Q

FORM Y

A

SPST NC DB

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17
Q

BIFURCATED CONTACTS

A

DOUBLE THE NUMBER OF CONTACT POINTS
PARALLEL PATHS
REDUCE CONTACT RESISTANCE
INCREASE RELAY SWITCHING RELIABILITY

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18
Q

SHADING COILS

A

CONTINUOUS LOOP OF COPPER EMBEDDED IN ARMATURE
SEALS IN ARMATURE
MINIMIZES CHATTERING

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19
Q

CONTACT MATERIALS

A

SILVER LOW VOLTAGE APPLICATION SELF CLEANING CAN BE WELDED
COPPER HIGH VOLTAGE HARD SURFACE HIGH PRESSURE PRONE TO OXIDATION
CADMIUM PLATED FREQUENT SWITCHING STRONG SPRING TENSION LONG LIFE NOT AS CONDUCTIVE

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20
Q

CONTACT SPRING

A

ABSORB SHOCK OF CLOSING
MAINTAIN PRESSURE

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21
Q

ARMATURE SPRING

A

PUSHES ARMATURE OPEN ON DEENERGIZATION

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22
Q

INCORRECT SPRING TENSION

A

INCREASE RESISTANCE
CONTACT BOUNCE
EXCESSIVE ARCING

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23
Q

SEAL IN VOLTAGE

A

85% RATED VOLTAGE

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24
DROP OUT VOLTAGE
50% RATED VOLTAGE
25
COIL CURRENT BEFORE SEAL IN ARMATURE
4 -10 TIMES HIGHER
26
HIGH COIL VOLTAGE
VIOLENT SNAP IN DAMAGE TO CONTACSTS NEVER 110% MORE
27
LOW COIL VOLTAGE
CONTACTS DONT CHANGE COIL BURN OUT CHATTERING ARCING PITTING HIGHER RESISTANCE
28
SHORT CIRCUIT
GROUND FAULT LINE TO LINE FAULT
29
OVERLOAD CONDITION
OVER NORMAL CIRCUIT CURRENT
30
FUSES
SHORT LENGTH OF CONDUCTOR PASSIVE CARRY NORMAL LOAD ACTIVE OPEN CIRCUIT UNDER ABNORMAL CONDITION
31
NON TIME DELAY FUSE
SINGLE ELEMENT FUSE IMMEDIATE
32
TIME DELAY FUSE
DUAL ELEMENT (THERMAL CUTOUT, FUSE ELEMENT) INVERSE TIME 500%
33
INSTANTANEOUS CIRCUIT BREAKERS
SHORT CIRCUIT OVER-CURRENT CONDITIONS ELECTROMAGNETIC COMPONENT SENSE INCREASE IN MAGNETIC FIELD
34
THERMAL MAGNETIC CIRCUIT BREAKER
TIME LIMIT CIRCUIT BREAKER OVERCURRNT PROTECTION SHORT CIRCUIT PROTECTION INVERSE TIME
35
TRIP FREE MECHANISM
TRIPS EVEN IF HELD IN ON POSITION
36
MOTOR PROTECTION
OVERCURRENT DEVICE OVERLOAD PROTECTION DEVICE
37
tHERMAL OVERLOAD DEVICE
SOLDER POT BIMETALLIC STRIP
38
FUSE CHARACTERISTICS
FAST BLOW (NORMAL AND ULTRA) SLOW BLOW TIME DELAY HALF CYCLE
39
OVERCURRNET DEVICE RATING
CONTINUOUS NORMAL INTERRUPTING MAXIMUM SAFELY OPEN
40
FAULT CURRENT VALUES
CIRCUIT VOLTAGE IMPEDANCE OF SHORT CIRCUIT PATH kVA OF SUPPLY TRANSFORMER PERCENT IMPEDANCE OF TRANSFORMER
41
FUSED DISSCONNECT
FUSES FOR OVERCURRENT PROTECTION DISCONNECT UNGROUNDED CONDUCTORS
42
FULL LOAD AMPERES
43
MOTOR CHARACTERISITCS
JOGGING LOWER THAN CONTINUOUS
44
NEMA SIZE
00 TO 9
45
IEC SIZE
AC-1 TO AC-4
46
FACTORS FOR MOTOR HEATING
MAGNITUDE OF LOAD DURATION OF OVERLOAD HOW OFTEN MOTOR STARTS TIME TAKEN TO GET TO SPEED AMBIENT TEMPERATURE COOLING ABILITY DUTY CYCLE
47
SINGLE PHASING
LOSS OF ONE PHASE OUT OF THREE LOOSE CONNECTION BREAK IN MOTOR SUPPLY OR MOTOR WINDING BLOWN FUSE BURNT OUT CONTACT
48
SERVICE FACTOR
1.15 = 1.25 <1.15 =1.15
49
MELTING ALLOY OVERLOAD DEVICE
SOLID TO LIQUID RESET BY HAND AFFECTED BY AMBIENT TEMPERATURE TAMPER PROOF NOT AFFECT BY VIBRATION REACTS TO SINGLE PHASING
50
BIMETALLIC STRIP OVERLOAD DEVICE
51
3 PHASE BIMETALLIC STRIP OVERLOAD
AUTO COMPENSATE FOR AMBIENT TEMP ADJUSTABLE MORE PRECISE
52
LOW VOLTAGE PROTECTION
3 WIRE MANUAL RESTART
53
LOW VOLTAGE RELEASE
2 WIRE CONTROL AUTO RESTART
54
NEMA NUMBERING
2 3 FWD HOLDING CONTACTS 4 5 REV HOLDING CONTACTS 6 FWD CONTACTOR 7 REV CONTACTOR
55
IEC NUMBERING
13 14 HOLDING CONTACTS A1 A2 CONTACTORS 95 96 OVERLOADS
56
SERIES FIXED RESISTANCE
CENTER HOT 2 ENDS COLD CUSTOM ORDER SPECICIF LENGTHS
57
POLYMER INSULATED
ONE CONDUCTOR 2 CONDCUCTOR 1 END 3 CONDUCTOR 1 END 3500M
58
PARALLEL FIXED RESISTANCE
CONSTANT WATTAGE SYSTEM CUT TO LENGTH
59
SELF REGULATING VARIABLE RESISTANCE
CHANGES RESISTANCE WITH TEMPERATURE INVERSE REALTIONSHIP
60
SKIN EFFECT HEAT TRACING
CURRENT FLOWS ONLY ON INSIDE OF FERROMAGNETIC TUBE WELDED TO PIPE HIGH VOLTAGE GROUNDED 3 TO 15 KM
61
SOFT START
GRADUAL RISE IN VOLTAGE
62
INTERVAL TIMING
CHANGES CONDITIONS OF TIMED CONTACTS IMMEDIATELY STAY CHANGED UNTIL A TIME PERIOD
63
ONE SHOT
TIMING FUNCTIONS BEGINS EACH TIME START TERMINAL RECIEVES A SIGNAL
64
REPEAT CYCLE TIMING
REGULAR ON AND OFF CYCLE
65
TDOE
TIME DELAY ON ENERGIZATION
66
TDOD
TIME DELAY ON DEENERGIZATION
67
SECTIONS FOR INTERLOCK CIRCUITS
GENERAL STOP FWD STOP FWD START FWD HOLDING REV STOP REV START REV HOLDING
68
PUSHBUTTON INTERLOCKING
69

2nd Period Electrican (4 decks)

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