Motor Protective Relay
K2CM
CSM_K2CM_DS_E_5_1
Solid-state Relay Enables Choice of Three
Operating Functions (Overcurrent, Open-
phase, and Reverse-phase)
• Protects 3-phase induction motors and their loads from dam-
age.
• Selection and combination of operating functions from overcur-
rent, open-phase, and reverse-phase.
• Circuit and output relay operation can be checked by just oper-
ating the test button.
• The set time value can be checked easily because operation
time is indicated from the start of operation.
• Space-saving, integrated construction.
Note:
If the K2CM is used with an inverter, the operating conditions will
depend on the load wiring length, inverter carrier frequency, basic
frequency, and load conditions. Error will occur in the operating
values of the overload elements. It is recommended to test
operation before using the K2CM.
Model Number Structure
■
Model Number Legend
K2CM-@@@-@@
1
2 3 4
5 6
5. Current setting range
LS:
2 to 8 A
L:
8 to 26 A
M:
20 to 65 A
H:
50 to 160 A
6. Operating time
None:
×1
(2 to 10 s)/
×4
(8 to 40 s) Switchable
7. Resetting method
None: Manual reset
A:
Automatic reset
8. Reverse-phase detection type
None: Current reverse-phase detection
V:
Voltage reverse-phase detection
1. Model
K2CM: Motor relay
2. Mounting style
None: Surface-mounting, integrated type
3. Operating time characteristics
None: Inverse type
Q:
Instantaneous type
4. Supply voltage of control circuit
1:
100/110/120 VAC
2:
200/220/240 VAC
4:
400/440 VAC
Ordering Information
■
List of Models
Voltage Reverse-phase Detection Models
Time specification
Resetting
method
Manual
Current setting range
Inverse type
8 to 26 A
K2CM-2LV
K2CM-2LAV
20 to 65 A
K2CM-2MV
K2CM-2MAV
50 to 160 A
K2CM-2HV
K2CM-2HAV
8 to 26 A
K2CM-Q2LV
K2CM-Q2LAV
Instantaneous type
20 to 65 A
K2CM-Q2MV
K2CM-Q2MAV
50 to 160 A
K2CM-Q2HV
K2CM-Q2HAV
Operating voltage
200/220/240 VAC
Automatic 200/220/240 VAC
1
K2CM
Current Reverse-phase Detection Models
Time specification
Resetting
method
Manual
Current setting range
Inverse type
2 to 8 A
K2CM-1LS
K2CM-2LS
---
8 to 26 A
K2CM-1L
K2CM-2L
K2CM-4L
20 to 65 A 50 to 160 A
K2CM-1M
K2CM-2M
K2CM-4M
K2CM-1H
K2CM-2H
K2CM-4H
2 to 8 A
K2CM-Q1LS
K2CM-Q2LS
---
Instantaneous type
8 to 26 A
K2CM-Q1L
K2CM-Q2L
K2CM-Q4L
20 to 65 A
K2CM-Q1M
K2CM-Q2M
K2CM-Q4M
50 to 160 A
K2CM-Q1H
K2CM-Q2H
K2CM-Q4H
Operating voltage
100/110/120 VAC
200/220/240 VAC
400/440 VAC
Automatic 100/110/120 VAC
(See
200/220/240 VAC
note.)
400/440 VAC
K2CM-1LSA K2CM-1LA K2CM-1MA K2CM-1HA K2CM-Q1LSA K2CM-Q1LA K2CM-Q1MA K2CM-Q1HA
K2CM-2LSA K2CM-2LA K2CM-2MA K2CM-2HA K2CM-Q2LSA K2CM-Q2LA K2CM-Q2MA K2CM-Q2HA
---
K2CM-4LA K2CM-4MA K2CM-4HA ---
K2CM-Q4LA K2CM-Q4MA K2CM-Q4HA
Note:
The manual resetting method must be used with reverse-phase detection.
■
Related Product
Transformer
Model
SE-PT400
Primary side
Secondary side
Voltage specification
Secondary power
consumption
380 to 480 V (wide power supply range) 7VA
190 to 240 V (wide power supply range)
Note:
Use this Transformer when a voltage reverse-phase detection model is used on a 400-V line.
Specifications
■
Ratings
Other features, such as 100% overcurrent capacity and flush mounting are also available. See
Model Number Legend
on page 1 for details.
Supply voltage of motor circuit
Supply voltage of control circuit
Insulation breakdown of output contact
200/220, 400/440 VAC, 50/60 Hz
100/110/120, 200/220/240, 400/440 VAC, 50/60 Hz
500 VAC
Operating voltage/current of output contact
NO contact: 120 VAC/2 A, 240 VAC/1 A, 440 VAC/0.5 A, 110 VDC/0.2 A, 220 VDC/0.1 A
(pf = 0.4 when breaking contact)
NC contact: 120 VAC/5 A, 240 VAC/2 A, 440 VAC/1 A, 110 VDC/0.2 A, 220 VDC/0.1 A
Contact form of output contact
Operating current range of input circuit
Operating voltage range of control circuit
Power consumption
Overcurrent function operating value
Current reverse-phase detection models: SPST-NO + SPST-NC
Voltage reverse-phase detection models: SPDT
2 to 160 A (Number of passes: 1)
85% to 110% of rated voltage, but operates normally at 50% of open-phase supply voltage
Approx. 3 VA (in standby state); 5 VA (in operating state)
115
±10%
of the setting value
Operating frequency range of control circuit
95% to 105% of rated frequency
Overcurrent function operating time setting
Inverse Type
range
Inverse time both at startup and during operation:
Timer scale
×
1 (s) at 600% overload
Timer scale
×
3 (s) at 200% overload
Note:
The above values are for a time factor setting of 1.
Instantaneous Type
Fixed time at starting (start-up lock)
•
Time setting value (varies between 2 and 40 s) at 140% overload and starting
Instantaneous during operation: 0.5 s max. (when current is increased from 100 to 140% of the
set current value)
Case color
Overcurrent function operating time
characteristics
Overcurrent function resetting value
Overcurrent function start-up operating
value
Open-phase operating value
Open-phase operating time
Reverse-phase operating value
Reverse-phase operating time
Imbalance operating value
Current imbalance factor
Munsell 5Y7/1
Inverse type:
±10%
of maximum setting value (at 600% overload)
Instantaneous type:
±20%
of maximum setting value (at 140% overcurrent and at starting)
100% min. of the setting value
Inverse type: Not applicable
Instantaneous type: 30% max. of the setting value (See note.)
85% max. of the set current value (at open-phase)
2 s max. (at overcurrent operating value)
50% max. of the current value (80% max. of the operating voltage)
1 s max. (at overcurrent operating value)
85% of the set current value
High: 35
±10%;
Low: 60% min. (at overcurrent operating value)
where
Reverse phase portion
Imbalance factor =
×
100 (%)
Normal
phase portion
Note:
The start-up lock timer restarts when the operating value at starting becomes less than 30% of the set current value.
2
K2CM
■
Characteristics
Variation due to
temperature
fluctuation
At 20
±20 °C
At 20
±30 °C
Overcurrent:
±5%
of operating value,
±10%
of operating time
Open-phase:
±10%
of operating value,
±10%
of operating time
Reverse-phase:
±10%
of operating value,
±10%
of operating time
Overcurrent:
±10%
of operating value,
±20%
of operating time
Open-phase:
±20%
of operating value,
±20%
of operating time
Reverse-phase:
±20%
of operating value,
±20%
of operating time
Variation due to
voltage fluctuation
Variation due to
frequency
fluctuation
At 85% to 110% of
Overcurrent:
±5%
of operating value,
±10%
of operating time
rated voltage
Open-phase:
±5%
of operating value,
±10%
of operating time
Reverse-phase:
±5%
of operating value,
±10%
of operating time
At 95% to 105% of
rated frequency
10 MΩ min. (between current-carrying terminals and mounting panel)
5 MΩ min. (between current-carrying terminals and between contact poles)
2,500 VAC (between current-carrying terminals and mounting panel and between current-carrying
terminals)
1,000 VAC (between contact poles)
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: 1.2/50
µs
Voltage reverse-phase detection models:
4,500 V (between current-carrying terminals and mounting panel)
Waveform: 1.2/50
µs
No abnormality develops when 20 times the set current value is applied for 2 s, 2 times with a 1-
minute interval.
No abnormality develops when 1.15 times the relay’s rated voltage is applied once for 3 hours.
No malfunction occurs when pulse containing 100% of the 2nd to 9th harmonics is applied (open-
phase switch set to “Low”). (See note.)
Malfunction: 10 to 55 Hz, 0.3-mm double amplitude (in X, Y, and Z directions for 10 minutes each)
Destruction: 10 to 25 Hz, 2-mm double amplitude (in X, Y, and Z directions for 2 hours each)
Malfunction: 98 m/s
2
(approx. 10 G) in X, Y, and Z directions
Destruction: 294 m/s
2
(approx. 30 G) in X, Y, and Z directions
Operating time
Setting
characteristics of
operating time
Set time value
Approx.
±30%
of the maximum setting value
Insulation resistance
Dielectric strength
Permissible impulse voltage
Overcurrent strength of main circuit
Overvoltage strength of control power
supply circuit
Variation due to waveform distortion
Vibration
Shock
Test current
(reference only)
Service life
Ambient temperature
Humidity
Altitude
Electrical: 10,000 operations
Operating:
−10
to 60
°C
(with no icing)
Storage:
−25
to 65
°C
35% to 85%
2,000 m max.
Note:
This means that no malfunction occurs with the open-phase element, but the operating value of the overload element may vary.
3
K2CM
Connections
■
Voltage Reverse-phase Detection Models
Terminal Arrangement
Manual Operation Low-voltage Circuit (High-
capacity Motor)
200 VAC
50/60Hz
R
S
T
Ta
Tc Tb U
V
W
Stop
Start
Output contacts Control power
(SPDT)
supply
•
Perform the external connections by referring to the examples given below.
•
Obtain the control power supply from the same phase as the power supply to
the magnet contactor coil.
•
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.)
Magnet
contactor
Phase advancing
capacitor
Current converter for
measuring device
@/5A
Alarm
buzzer
BZ
M
Motor
R
U
A
1
S
V
B
2
T
W
C
3
Ta Tc Tb
U
V
W
Motor protective relay
Automatic Operation Low-voltage Circuit
200 VAC
50/60Hz
R S T
Manual Operation Low-voltage Circuit
200 VAC
50/60Hz
R S T
Stop
Start
Automatic
contact
Magnet
contactor
Magnet
contactor
Phase advancing
capacitor
BZ
Alarm
buzzer
S
V
B
2
T
W
C
3
Phase
advancing
capacitor
R
U
A
1
S
V
B
2
T
W
C
3
BZ
Alarm
buzzer
R
U
A
1
Ta Tc Tb
U
V
W
Ta Tc Tb
U
V
W
Motor protective relay
Motor protective relay
M
Motor
M
Motor
Manual Operation High-voltage Circuit
3, 300 VAC
50/60Hz
R S T
Transformer
@/200V
Manual Operating Low-voltage Circuit (
Start)
200 VAC
50/60Hz
R S T
High-tension
fuse
X/a
Stop
Stop
Start
High-voltage
magnet contactor
Start
Magnet
contactor
Auxiliary
relay
Phase advancing
capacitor
Current converter for
measuring device
@/5A
X
Phase
advancing
capacitor
Alarm
buzzer
R
U
A
1
S
V
B
2
T
W
C
3
BZ
R
U
A
1
S
V
B
2
T
W
C
3
BZ
Alarm
buzzer
Ta Tc Tb
U
V
W
M
High-voltage
motor
Ta Tc Tb
U
V
W
Motor protective relay
changeover
Motor protective relay
M
Note:
Connect the phase advancing capacitor on the power supply
side of the Motor Protective Relay as shown in the above dia-
grams.
4
K2CM
■
Current Reverse-phase Detection Models
Terminal Arrangement
Manual Operation Low-voltage Circuit (High-
capacity Motor)
200 VAC
50/60Hz
R S T
a
1
c
1
b
2
C
2
S
1
S
2
Stop
Start
Output contacts Control power
(NO and NC)
supply
•
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.)
Magnet
contactor
Phase advancing
capacitor
Current converter for
measuring device
@/5A
Alarm
buzzer
BZ
M
Motor
R
U
A
1
S
V
B
2
T
W
C
3
a
1
c
1
b
2
c
2
s
1
s
2
Motor protective relay
Manual Operation Low-voltage Circuit
200 VAC
50/60Hz
R
S
T
Automatic Operation Low-voltage Circuit
200 VAC
50/60Hz
R S T
Stop
Start
Automatic
contact
Magnet
contactor
Magnet
contactor
Phase
advancing
capacitor
R
U
A
1
S
V
B
2
T
W
C
3
BZ
Alarm
buzzer
Phase advancing
capacitor
R
U
A
1
S
V
B
2
T
W
C
3
BZ
Alarm
buzzer
a
1
c
1
b
2
c
2
s
1
s
2
Motor protective relay
a
1
c
1
b
2
c
2
s
1
s
2
Motor protective relay
M
Motor
M
Motor
Manual Operating Low-voltage Circuit (
Start)
R
200 VAC
50/60Hz
S T
Manual Operation High-voltage Circuit
3,300 VAC
50/60Hz
R S T
Transformer
@/100V
Stop
Start
High-tension
fuse
X/a
Stop
High-voltage
magnet contactor
Magnet
contactor
Start
Auxiliary
relay
Phase
advancing
capacitor
Alarm
buzzer
R
U
A
1
S
V
B
2
T
W
C
3
X
BZ
Phase advancing
capacitor
Current converter for
measuring device
@/5A
Alarm
buzzer
R
U
A
1
S
V
B
2
T
W
C
3
a
1
c
1
b
2
c
2
s
1
s
2
Motor protective relay
BZ
changeover
M
M
High-voltage
motor
a
1
c
1
b
2
c
2
s
1
s
2
Motor protective relay
Note:
Connect the phase advancing capacitor on the power supply
side of the Motor Protective Relay as shown in the above
diagrams.
5
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