K2CM-1LA Omron, K2CM-1LA Datasheet - Page 9

• Manufacturer Part Number: K2CM-1LA
• Description: RELAY MOTOR PROTECTIVE 8-26A
• Manufacturer: Omron
• Series: K2CMr

Specifications of K2CM-1LA

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: K2CM1LA

LED Indicators
When the motor circuit trips due to overcurrent, open-phase, or
reverse-phase, the respective LED indicator lights (continuously).
The overcurrent indicator also indicates the start of operation.
• With the inverse-type models, when the motor current exceeds the
• Since the indicator status is not stored in memory when the opera-
The functions of the K2CM can be used in the following seven combi-
nations. For each function, turn ON the corresponding setting switch.
When the setting switches for overcurrent, open-phase, or reverse-
phase function are turned OFF, the following functions becomes
invalid.
1. Overcurrent Setting Switches
These switches select the overcurrent setting and the multiplying fac-
tor linked with operating time setting.
2. Open-phase Setting Switches
These switches select the open-phase detecting function and the
“High” or “Low” current imbalance factor for operation.
3. Reverse-phase Setting Switches
These switches select the reverse-phase detection function and
reverse-phase polarity. By selecting the reverse-phase polarity
accordingly, the K2CM can operate normally without changing the
connections when wired with the order of the phases reversed.
Combination
1
2
3
4
5
6
7
Overcurrent
Open-phase
Reverse-phase
Overcurrent
detecting function
Time setting
multiplying factor
Open-phase
detecting
function
Imbalance factor
overcurrent operating value, the overcurrent indicator blinks at the
bright level and then remains lit at the dimmed level. After the oper-
ating time has elapsed, with the manual resetting models, the
motor circuit trips and the overcurrent indicator remains lit at the
bright level, whereas with automatic resetting models, the indicator
remains lit at the bright level until the motor current descends below
the resetting value.
tion power supply is turned OFF, be sure to check which indicators
were illuminated when the motor circuit was tripped.
Function setting switch
Overcurrent operating value
(115% of current-setting value)
Function
set to OFF
ON
ON
ON
ON
Motor current
Overcurrent
ON
OFF
High
Low
ON
OFF
× 4 (s) Time setting scale value × 4 = 8 to 40 s
× 1 (s) Time setting scale value × 1 = 2 to 10 s
Time setting and multiplication
“High” and “Low” imbalance factors
“Forward” and “Reverse” function
Enabled
Disabled
Enabled
Disabled
The motor circuit operates at an
operating imbalance factor of 35
±10%.
The motor circuit operates at an
operating imbalance factor of 60%.
ON
ON
ON
ON
Open-phase
Invalid function
Start
Bright
Dimmed
ON
ON
ON
ON
Reverse-phase
Trip
Bright
If the K2CM detects reverse-phase although the motor is rotating in
the forward direction (e.g., because of incorrect wiring of power
lines), set the reverse-phase polarity switch to the “Reverse” position
to enable normal operation.
Note: The K2CM detects reverse-phase at a point before the current
Reverse-detectable Range
* The reverse-phase polarity switching function is applicable to cur-
Reverse-phase
detecting
function
Reverse-phase
polarity
Connections
Reverse-phase
polarity switch
position
Trip
Direction of
motor rotation
Coun-
ter-
mea-
sure
Direction of
motor rotation
Phase condition
R
R
rent reverse-phase detection models only.
M
S
S
transformer. If a reverse connection 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.
T
T
Reverse-
phase
polarity
switch
position
Wiring
Detectable:
Undetectable: Reverse-phase state on the motor side cannot
Normal
None
Forward
Forward
ON
OFF
Normal
Reverse
Reverse-phase state can be detected with the
motor protective relay only on the power supply
side.
be detected with the motor protective relay.
R
R
Normal
M
S
S
T
T
Motor
relay
Enabled
Disabled
The motor circuit trips at reverse-
phase when a reverse-phase is
detected.
Used when a reverse-phase
connection is made in the power line
of the motor at a point before the
current transformer (including
external current transformer).
Normal
Yes
Reverse
(See below.)
Reverse Reverse Reverse Reverse
Wiring
changed
at (A).
R
R
Reverse
M
S
S
Wiring
changed
at (B).
(B)
T
T
Motor
(A)
relay
Normal
None
Reverse
Wiring
changed
at (C).
K2CM
R
R
Reverse
M
S
S
Wiring
changed
at (D).
T
T
(D)
(C)
Motor
relay
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