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5

K2CM

Current Reverse-phase Detection Models

Terminal Arrangement

Perform the external connections by referring to the examples given below.

Connect the phase advancing capacitors closer to the power supply than the
current transformer as shown in the examples.

Tighten the terminal screws to a torque of 0.98 N·m max. (The appropriate
tightening torque is 0.49 to 0.67 N·m.)

Use of insulated solderless terminals is recommended for connection to the
Relay terminals (M3.5). 

Note: 1.

In principle, the K2CM must be surface mounted with the terminal
block facing downward.

2.

Use M5 screws with spring washers and flat washers for mounting.
Tighten the screws to a torque of 1.77 N·m max. (The appropriate
tightening torque is 1.08 to 1.57 N·m.) 

Manual Operation Low-voltage Circuit

Manual Operating Low-voltage Circuit (

 

Start)

Note:

Connect the phase advancing capacitor on the power supply 
side of the Motor Protective Relay as shown in the above 
diagrams.

Manual Operation Low-voltage Circuit (High-
capacity Motor)

Automatic Operation Low-voltage Circuit

Manual Operation High-voltage Circuit

S

1

C

2

b

2

a

1

c

1

S

2

O

u

tp

u

t contacts

(

N

O and 

N

C)

Control po

w

er

s

u

pply

R

S

T

BZ

R
U
A

1

S

V

B
2

T

W

C

3

a

1

c

1

b

2

c

2

s

1

s

2

M

200 

V

AC

50/60Hz

Stop

Start

Phase 
ad

v

ancing

capacitor

Alarm

bu

zzer

Magnet 
contactor

Motor protecti

v

e relay

Motor

R

S

T

BZ

R
U
A

1

S

V

B
2

T

W

C

3

a

1

c

1

b

2

c

2

s

1

s

2

M

changeo

v

er

200 

V

AC

50/60Hz

Stop

Start

Phase 
ad

v

ancing

capacitor

Alarm

bu

zzer

Magnet 
contactor

Motor protecti

v

e relay

R

S

T

BZ

R
U
A

1

S

V

B
2

T

W

C

3

a

1

c

1

b

2

c

2

s

1

s

2

M

C

u

rrent con

v

erter for

meas

u

ring de

v

ice 

@

/5A

Motor

200 

V

AC

50/60Hz

Stop

Start

Phase ad

v

ancing

capacitor

Alarm

bu

zzer

Magnet 
contactor

Motor protecti

v

e relay

R

S

T

BZ

R
U
A

1

S

V

B
2

T

W

C

3

M

a

1

c

1

b

2

c

2

s

1

s

2

A

u

tomatic 

contact

Motor

200 

V

AC

50/60Hz

Phase ad

v

ancing

capacitor

Alarm

bu

zzer

Magnet 
contactor

Motor protecti

v

e relay

R

S

T

X/a

BZ

R
U
A

1

S

V

B
2

T

W

C

3

M

Transformer 

@

/100

V

a

1

c

1

b

2

c

2

s

1

s

2

X

3,300 

V

AC

50/60Hz

A

u

xiliary

relay

High-

v

oltage

motor

High-tension
f

u

se

C

u

rrent con

v

erter for

meas

u

ring de

v

ice 

@

/5A

Stop

Start

Phase ad

v

ancing

capacitor

Alarm

bu

zzer

High-

v

oltage 

magnet contactor

Motor protecti

v

e relay

Summary of Contents for K2CM Series

Page 1: ...ng the K2CM Model Number Structure Model Number Legend 1 Model K2CM Motor relay 2 Mounting style None Surface mounting integrated type 3 Operating time characteristics None Inverse type Q Instantaneou...

Page 2: ...AC 2 A 440 VAC 1 A 110 VDC 0 2 A 220 VDC 0 1 A Contact form of output contact Current reverse phase detection models SPST NO SPST NC Voltage reverse phase detection models SPDT Operating current range...

Page 3: ...Current reverse phase detection models 6 000 V between current carrying terminals and mounting panel 4 500 V between current carrying terminals and between control power supply terminals Waveform 1 2...

Page 4: ...Manual Operation High voltage Circuit Note Connect the phase advancing capacitor on the power supply side of the Motor Protective Relay as shown in the above dia grams Ta Tc Tb U V W Output contacts...

Page 5: ...t High capacity Motor Automatic Operation Low voltage Circuit Manual Operation High voltage Circuit S1 C2 b2 a1 c1 S2 Output contacts NO and NC Control power supply R S T BZ R U A 1 S V B 2 T W C 3 a1...

Page 6: ...ens of seconds to settle to the rated current This time varies largely depending on type of motor and the nature of motor load wt There fore it is necessary to obtain the motor s starting time for ope...

Page 7: ...required for the detection of inter nal open phases in delta connected motors Consult your OMRON representative before using this method When a transformer is con nected as a load the harmonics increa...

Page 8: ...n is released after the motor circuit has tripped the circuit remains tripped whereas with automatic resetting models the motor circuit continues operating and the output relay releases Deciding the N...

Page 9: ...is made at the load side far from the current transformer and the motor rotates in the re verse direction the K2CM does not detect the reverse phase Reverse detectable Range The OR phase circuit in th...

Page 10: ...aracteristics for Inverse Type Overload Operating Time Characteristics for Instantaneous Type 2 0 1 0 0 100 200 300 400 500 600 700 This graph shows the behavior when the current changes from 100 of t...

Page 11: ...ive motor full load characteristics of 200 VAC 4 pole totally enclosed Note When using a large capacity or high voltage motor whose capacity is 45 kW or more calculate the rated current alternating cu...

Page 12: ...the input phases for the cur rent transformer 2 Turn ON SW1 and SW2 Gradually increase the current by adjusting the voltage regulator 3 Confirm that the K2CM operates at a current no greater than 85 o...

Page 13: ...3 Using the voltage regulator abruptly increase the current to 140 of the set current value Confirm that the K2CM performs the instantaneous operation 4 Turn OFF SW1 and SW2 Open phase 1 Open disconn...

Page 14: ...ection of a high voltage motor or low voltage high capacity motor use an external rectifier that does not saturate at currents up to 600 of the rated motor current and thus permits a large overcurrent...

Page 15: ...ase with the K2CM Connection Method Pass wires through any two of the three holes on the K2CM If a single phase is used set the open phase and reverse phase switch to OFF Make the overload settings so...

Page 16: ...ther in no event shall liability of Omron Companies exceed the individual price of the Product on which liability is asserted Suitability of Use Omron Companies shall not be responsible for conformity...

Page 17: ...2CM 1LA K2CM 1LS K2CM 1M K2CM 1MA K2CM 2H K2CM 2HA K2CM 2L K2CM 2LA K2CM 2LS K2CM 2M K2CM 2MA K2CM 4H K2CM 4HA K2CM 4L K2CM 4LA K2CM 4M K2CM 4MA K2CM Q1H K2CM Q1HA K2CM Q1L K2CM Q1LA K2CM Q1LS K2CM Q1...

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