K2CM-Q2MA Datasheet, PDF (12/16 Pages) Omron Electronics LLC – Solid-state Relay Enables Choice of Three Operating Functions (Overcurrent, Openphase, and Reverse-phase)

Testing Method
■ Current Reverse-phase Detection Models
The operating characteristics listed in the table below are
tested using the circuit shown on the right. Decide the number
of conductor passes through the holes of the current trans-
former in accordance with the operating current range of the
Motor Protective Relay and by referring to the current setting
method described under Operation, Setting, and Indication.
200 V
50/60 Hz
(3-phase)
U
V
W
SW1
K2CM
100 VAC
50/60Hz
3φSD
CC
100 V
C
±
Y
SW2
a1 c1 b2 c2 s1 s2
Minimum set time is 2 s.
R1
R1
R2
K2CM Motor Protective Relay
3φSD: Three-phase voltage regulator (5 to 15 A)
A: AC ammeter (5 A)
V: AC voltmeter (300 V)
CC: Cycle counter
Y: Auxiliary relay (15 A)
R1: Variable resistor (50 Ω, 400 W + 400 W)
R2: Fixed resistor (50 Ω, 400 W + 400 W)
SW1: Knife switch (3-phase)
SW2: Toggle switch
Test item
Test procedure
Operating value
Operating time
Over- Inverse type
current
1. Turn ON SW1.
1. Turn ON SW1 and SW2. Increase the current to 600% of
2. Turn ON SW2 to operate auxiliary relay Y.
the set current value by adjusting the voltage regulator.
3. Gradually increase the current by adjusting the voltage ^{Turn OFF SW1 and SW2.**}
regulator. With inverse-type models, read the value of the 2. Turn ON SW1.
current when the overcurrent LED indicator blinks. With 3. Turn ON SW2 and read the position (i.e., time) of the
instantaneous-type models, read the value when it lights pointer of cycle counter CC when CC is stopped by the
(continuously).*
operation of the K2CM. The read time is the operating time
4. Turn OFF SW1 and SW2.
for inverse-type models and the lock time of the instanta-
neous-type models.
4. Turn OFF SW1 and SW2.
Instantaneous
type
1. Turn ON SW1 and SW2. Increase the current to 100% of
the set current value by adjusting the voltage regulator.
Turn OFF SW1 and SW2.
2. Turn ON SW1 and SW2 again and wait 2 seconds mini-
mum.
3. Using the voltage regulator, abruptly increase the current
to 140% of the set current value. Confirm that the K2CM
performs instantaneous operation.
4. Turn OFF SW1 and SW2.
Open-phase
1. Open (disconnect) any one of the input phases for the cur- 1. Open (disconnect) any one of the input phases for the cur-
rent transformer.
rent transformer.
2. Turn ON SW1 and SW2. Gradually increase the current by 2. Turn ON SW1 and SW2. Increase the currents of the other
adjusting the voltage regulator.
two phases to 115% of the set current value by adjusting
3. Confirm that the K2CM operates at a current no greater ^{the voltage regulator. Turn OFF SW1 and SW2 temporarily.}
than 85% of the set current value and that, at this current, 3. Turn ON SW1 and SW2 again. Read the position (i.e.,
the trip indicator is orange and the open-phase LED indica- time) of the pointer of cycle counter CC when CC is
tor lights.
stopped by the operation of the K2CM.
4. Turn OFF SW1 and SW2.
4. Turn OFF SW1 and SW2.
Reverse-phase
1. Interchange any two phases at a position closer to the 1. Interchange any two phases at a position closer to the
power supply than the current transformer. (In the above power supply than the current transformer. (In the above
figure, phases U and V are interchanged as shown by the figure, phases U and V are exchanged as shown by the
dotted lines.)
dotted lines.)
2. Turn ON SW1 and SW2. Decrease the current to 50% of 2. Turn ON SW1 and SW2. Increase the current to 100% of
the set current value by adjusting the voltage regulator. the set current value by adjusting the voltage regulator.
Then turn OFF SW1 and SW2 temporarily.
Then turn OFF SW1 and SW2 temporarily.
3. Turn ON SW1 and SW2 again. Confirm that the K2CM 3. Turn ON SW1 and SW2 again. Read the position (i.e.,
operates, the trip indicator is orange, and that the reverse- time) of the pointer of cycle counter CC when CC is
phase LED lights.
stopped by the operation of the K2CM.
4. Turn OFF SW1 and SW2.
4. Turn OFF SW1 and SW2.
* Balance the currents between phases by adjusting variable resistor R1.
** If a current equal to 600% of the set current value cannot be attained by adjusting the voltage regulator, increase the number of conductor passes
through the holes of the current transformer.
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