General
One of the common faults faced in industrial plants is over-heating and burning of
3 phase motors due to the phase failure. Thermic-magnetic device which is an
essential element in motor protection is generally too slow due to both its electro-
mechanical structure and the use of high current setting range to assure demarrage
without tripping. Being designed to eliminate the above disadvantages, MKC-01
and MKC-03 Phase Failure Devices react within 0.2 seconds (fixed) against the
following faults and take the motor out of service.
PHASE FAILURE PROTECTION DEVICES
MKC-01, MKS-01, MKC-03, MKS-03, MKC-04
Connection Diagram
A4908 / Rev.4
Function Diagram
2. Phase Sequence (MKC-03, MKS-03, MKC-04)
When the phase sequence is correct (L1, L2, L3 in clockwise direction) the output
relay is activated; however, if the sequence is changed by any reason, the output
relay switches OFF immediately.
The voltage asymmetry causes the rise in motor temperature and a reduction of
the rated motor power.
1. Voltage Unbalance (Not Adjustable)
MKC-01 and MKC-03 have neutral connection.
Unbalanced voltage for Phase-Neutral (fixed). When the value exceeds the 40% for
MKC-03 and MKC-04 or 20% for MKC-01 and MKS-01 output relay switches-off the
motor.
Unbalanced voltage may occured when;
The mains are loaded with unbalanced distribution,
One of the 3-phase of motor has lost. In this case, some amount of voltage which
produced by other phases will be inducted on the lost phase. Amount of this value
depends on both the motor type and amount of load.
Output relay is activated when a phase has lost or an unbalanced phase-neutral
value, which is occured with any reason, is smaller than the Asymetrical value which
is defined for the device. If this unbalanced voltage exceeds the adjusted Asymetrical
value, output will release itself and motor will be Switched-off.
In Applications; a proper device must be used regarding to the inducted voltage
value in two-phase which are remained after the other one has lost.
PK 22
PK 28
PK 25
PK 25
: Please look at labels on the device.
: 3 phase and neutral 220-230 VAC
4 Wires Star Connection (MKC-01, MKC-03, MKS-01, MKS-03)
: 3 Phase 380 VAC
3 Wires Delta Connection (MKC-04)
: 3 Phase 220 V AC
3 Wires Delta Connection (MKC-04)
: (0.9-1.1) x Un (MKC-04)
(0.8-1.2) x Un (MKC-01, MKC-03, MKS-01, MKS-03)
: 50/60 Hz.
: 1 C/O, 8A, 250 V AC, 2000 VA, Cos
j
=1 (MKC-01, MKC-03, MKC-04)
1 NO, 8A, 250 V AC, 2000 VA, Cos
j
=1 (MKS-01, MKS-03)
: LED output, normally ON (OFF for any fault)
ON LEDi : On when supply voltage is present (MKC-01, MKC-03)
: 0.2 sec.
: -5 °C ; +50 °C
: IP 20
: Typ PK 22 (MKS-01, MKS-03)
Typ PK 25 (MKC-01, MKC-03, MKC-04)
Typ PK 28 ((MKC-01, MKC-03)
: Surface mounting or on the mounting rails.
Panel mounting with screws and adapter is possible. (Refer to Figure 1)
: 0.08 kg. (MKS-01, MKS-03)
0.1 kg. (MKC-01, MKC-03)
0.2 kg. (MKC-04)
Rated Voltage (Un)
Operating Range
Rated Frequency
Output Contacts
Warning LEDs
Tripping Time
Ambient Temperature
Protection Class
Dimension
Installation
Weight
Dimensions
C1
T1
Stop
T1
M
3 ~
Start
L1
L2
L3
N
C1
N
L1 L2 L3
MKC-01
MKC-03
1 2 3
N
C1
T1
N
M
3 ~
L1
L2
L3
N
L3
N
L2
L1 1
2
MKS-01
MKS-03
C1
T1
Stop
T1
N
M
3 ~
Start
L1
L2
L3
N
C1
N L1 L2 L3
MKC-01
MKC-03
3
2
1
C1
T1
Stop
T1
N
M
3 ~
Start
L1
L2
L3
C1
L1 L2 L3
MKC-04
3
2
1
TYPE PK25
35 mm
90 mm
45 mm
62 mm
58 mm
32 mm
48 mm
35 mm
TYPE PK28
48 mm
34 mm
90 mm
35.3 mm
59.7 mm
45.4 mm
61.8 mm
36 mm
V
L3
V
L1
V
L1
V
L2
V
L2
V
Ref
V
Ref
= 220 VAC
x 100
Asymmetry % =
-
V
L1
V
L2
Fixed unbalance value
Hysterisis
L1
L2
L3
Output Relay (MKC-03)
TD = Tripping Time
TD
TD
Output Relay (MKC-01)
Wrong Phases Sequence
Precautions For Installation and Safe Use
Failure to follow those instructions will result in death or serious injury.
Disconnect all power before working on equipment.
When the device is connected to the network, do not remove the front panel.
Do not try to clean the device with solvent or the like. Only clean the device
with a dried cloth.
Verify correct terminal connections when wiring.
Electrical equipment should be serviced only by your compedent seller.
Mount device to the panel.
No responsibility is assured by the manufacturer or any of its subsidiaries
for any consequences arising out of the use of this material.
Technical Data
Figure 1
23
mm
12
mm
35
mm
19
mm
19mm
61
mm
90
mm
28mm
48mm
58mm
45
mm
TYPE PK22
Vertrieb durch TDE Instruments GmbH
