Data sheet
CI-tronic™ Soft start motor controller
MCI 3, MCI 15, MCI 25, MCI 30 I-O, MCI 40-3D I-O and MCI 50-3 I-O
The MCI soft starters are designed for soft
starting and stopping of 3 phase AC motors, thus
reducing the inrush current and eliminating the
damaging effects of high starting torque surges.
The digitally controlled soft starter features
accurate settings and easy installation.
The controller has individually adjustable
acceleration and deceleration times.
Thanks to the adjustable initial torque and the
unique breakaway (kick start) function the soft
starter can be optimized for almost any
application.
The MCI soft starters are typically used on motor
applications where a smooth start and/or stop is
advantageous, such as conveyors, fans, pumps,
compressors and high inertia loads. MCI soft
starters are also obvious as replacement for
star/delta starters.
Features • Motor load max. 50 A
• Acceleration times adjustable:
0 – 10 seconds, MCI 3, MCI 15 and MCI 25
0 – 20 seconds, MCI 30 I-O
0 – 30 seconds, MCI 40-3D I-O, MCI 50-3 I-O
• Deceleration times adjustable:
0 – 10 seconds, MCI 3, MCI 15, and MCI 25
0 – 20 seconds, MCI 30 I-O
0 – 60 seconds, MCI 40-3D I-O, MCI 50-3 I-O
• Initial torque adjustable up to 85%
• Breakaway function (kick start)
• Universal control voltage:
24 – 480 V AC / DC
• Automatic detection of missing phases
• Automatic adaptation to 50/60 Hz
• Optional auxiliary contacts
• LED Status indication
• Unlimited start/stop operations per hour
• Built in varistor protection
• Compact modular design
• DIN rail mountable
• EN 60947-4-2
• CE and CULUS (UL 508)
• EAC and LLC approved
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Data sheet | CI-tronic™ Soft start motor controller, Type MCI 3, MCI 15, MCI 25, MCI 30 I-O, MCI 40-3D I-O and MCI 50-3 I-O
Adjustments
Motor torque
(voltage)
Kick start
selectable
Ramp-up time Ramp-down time
Selection guide
Time
Aux. contacts Code no.
Type
Operational
voltage
Adjustable starting torque
Motor
current
max.
Motor power
max.
Module
dimensions
[V AC] [A] [kW / HP] [mm]
MCI 15 208 – 240 15 4.0 / 5.5 45 – 037N0037
MCI 25 208 – 240 25 (30) ) 11 / 15 ) 90 I–O, bypass 037N0069
MCI 50–3 I–O 208 – 240 35 (50) ) 15 / 20 ) 180 I–O, bypass 037N0089
MCI 3 380 – 415 3 1.5 / 2 22.5 – 037N0074
MCI 3 440 – 480 3 1.5 / 2 22.5 – 037N0084
MCI 15 380 – 480 15 7.5 / 10 45 – 037N0039
MCI 25 380 – 480 25 11 / 15 90 – 037N0040
MCI 30 I–O 380 – 480 25 (30) ) 15 / 20 ) 90 I–O, bypass 037N0070
MCI 40–3D I–O 380 – 480 29 (43) ) 21 / 28 ) 90 I–O, bypass 037N0092
MCI 50–3 I–O 380 – 480 35 (50) ) 22 / 30 ) 180 I–O, bypass 037N0090
MCI 15 500 – 600 15 7.5 / 10 45 – 037N0041
MCI 25 500 – 600 25 15 / 20 90 – 037N0042
) If used with bypass contactor
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Data sheet | CI-tronic™ Soft start motor controller, Type MCI 3, MCI 15, MCI 25, MCI 30 I-O, MCI 40-3D I-O and MCI 50-3 I-O
Technical data
Output Specification MCI 3 MCI 15 MCI 25 MCI 30 I-O MCI 40-3D I-O MCI 50-3 I-O
Operational current
max.
208 – 240 V AC
380 – 480 V AC
500 – 600 V AC
Leakage current max 5 mA
Min. operational current 50 mA
Overload relay trip class Class 10
Semiconductor
protection
Type 1 co-ordination
Type 2 co-ordination
I2 t (t = 10ms)
AC-53a
Asynchronous motors
AC-53b Asynchronous
motors with bypass
AC-58a Hermetic
refrigeration
compressors
Control Circuit Specifications
Control voltage range 24 – 480 V AC / DC
Pick-Up voltage max. 20.4 V AC / DC
Drop-out voltage min. 5 V AC / DC
Max. control current for
no operation
Control current /
Power max.
Response time max. 70 ms
Ramp-up time adjust. from 0 – 10 seconds 0 – 20 seconds 0 – 30 seconds
Ramp-down time adjust. from 0 – 10 seconds 0 – 20 seconds 0 – 60 seconds
Initial Torque adjust. from 0 – 85% of nominal torque with optional kick start
SCR Aux. contacts, opt.
voltage/current max.
(AC-14, AC-15)
Fuse max. I2t (t = 10ms) 10 A gL/gG, I2t max. 72 A2s
EMC immunity and
emission
3 A 15 A 25 A
0.1 – 0.7 kW (0.18 – 1 HP)
0.1 – 1.5 kW (0.18 – 2 HP)
0.1 – 2.2 kW (0.18 – 3 HP)
25 A gL/gG 72 A²s 50 A gL/gG 1800 A²s 80 A gL/gG 6300 A²s 80 A gL/gG 6300 A²s 80 A gL/gG 6300 A²s 125 A gL/gG 25300 A2s
–
3A: AC-53b: 5-5: 10 – – 30A: AC-53b: 5-5: 30
–
1 mA
15 mA / 2 VA
24 – 480 V AC / 0.5 A 24 – 480 V AC / 1.0 A
Meets requirements of EN 60947-4-2
0.1 – 4.0 kW (0.18 – 5.5 HP)
0.1 – 7.5 kW (0.18 – 10 HP)
0.1 – 7.5 kW (0.18 – 10 HP)
15A: AC-53a: 8-3:
100-3000
15A: AC-58a: 6-6:
100-3000
0.1 – 7.5 kW (0.18 – 10 HP)
0.1 – 11 kW (0.18 – 15 HP) 0.1 – 15 kW (0.18 – 20 HP) 0.1 – 21 kW (0.18 – 28 HP) 0.1 – 22 kW (0.18 – 30 HP)
0.1 – 15 kW (0.18 – 20 HP)
Rating index:
25A: AC-53a: 6-5:
25A: AC-58a: 6-6:
Motor size at:
100-480
100-480
30 A
(if bypassed during
steady state)
0.1 – 11 kW (0.18 – 15 HP)
0.1 – 18.5 kW (0.18 – 25 HP)
25A: AC-53a: 6-5:
100-480
25A: AC-58a: 6-6:
100-480
43 A
(if bypassed during
steady state)
–
–
29A: AC-53a: 6-5:
100-120
43A: AC-53b: 5-5: 30
– –
50 A
(if bypassed during
steady state)
0.1 – 15 kW (0.18 – 20 HP)
0.1 – 30 kW (0.18 – 40 HP)
35A: AC-53a: 6-6:
100-120
50A: AC-53b: 6-6: 30
Insulation
Rated installation voltage, Ui
Rated impulse withstand
voltage, U
Installation Category III
Thermal specifications MCI 3 MCI 15 MCI 25 MCI 30 I-O MCI 40-3D I-O MCI 50-3 I-O
Power dissipation ),
continuous duty max.:
Power dissipation ),
Intermittent duty max.:
Ambient temperature
range
Cooling method Natural convection
Mounting Vertical +/- 30°
Max. ambient temperature
with limited rating
Storage temp. range -20 °C – 80 °C
Protection degree /
pollution degree
Materials
Housing Self extinguishing PPO UL94V1
Heatsink Aluminum black anodized
Base Electroplated steel
) If used without a bypass contactor
V
imp
660 V AC
4 k
4 W 2 W/A 2 W/A 2 W/A 3 W/A 3 W/A
4 W 2 W/A x duty cycle 2 W/A x duty cycle 2 W/A x duty cycle 3 W/A x duty cycle 3 W/A x duty cycle
-5 °C – 40 °C
60 °C, see derating for high temperatures in chart page 7
IP20 / IP3 IP10 / IP3
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Data sheet | CI-tronic™ Soft start motor controller, Type MCI 3, MCI 15, MCI 25, MCI 30 I-O, MCI 40-3D I-O and MCI 50-3 I-O
Functional diagram
Mains voltage L1, L2, L3
Control voltage (A1, A2)
Motor voltage ( T1, T2, T3)
LED 1
LED 2
Aux. contacts:
23 – 24 bypass
13 – 14 I-O
Example 1: Example 2:
Soft start and soft stop Soft start with kick start and soft stop
Functional description
LED status indication
Ramp up
During ramp-up the controller will gradually increase
the voltage to the motor until it reaches full line voltage.
The motor speed will depend on the actual load on the
motor shaft. A motor with little or no load will reach
full speed before the voltage has reached its maximum
value. The actual ramp time is digitally calculated and
will not be influenced by other settings, net frequency or
load variations.
Initial torque
The initial torque is used to set the initial starting voltage. This way it is possible to adapt the controller to an
application requiring a higher starting torque. In some
cases on application with very high break-away torque
the initial torque can be combined with a kick start
function. The kick start is a period of 200 ms where the
motor receives full voltage.
Soft stop
During ramp-down the controller will gradually reduce
the voltage to the motor thus reducing the torque and
current. As a consequence the motor speed will fade
off. The soft stop feature is advantageous to avoid liquid
hammering and cavitation on pumps, and to avoid
goods tilting on conveyors.
LED status indication:
LED 1
LED 2
Auxiliary contacts, optional
The auxiliary contacts are made possible by means of
SCR technology and will only switch correctly on
AC current.
I-0 contact (13 – 14):
The contact will be closed as long as the controller
receives a control voltage, see functional diagram.
Bypass contact (23 – 24):
The contact is intended for operating an external bypass
contactor. The contact will close when the controller is in
steady state operation, see functional diagram.
© Danfoss | DCS (rm) | 2019.09
Stand Ramp- Full Ramp- Line or
by up on down load error
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Data sheet | CI-tronic™ Soft start motor controller, Type MCI 3, MCI 15, MCI 25, MCI 30 I-O, MCI 40-3D I-O and MCI 50-3 I-O
Wiring
Overload and Short Circuit
Protection
MCI 15, MCI 25 MCI 30 I-O MCI 50-3
Overload and short circuit protection is easily achieved
by installing a circuit breaker on the line side of the soft
starter. Select the circuit breaker from the table
according to motor full load current.
380 – 415 V AC
Circuit
breaker
Type
CTI 25M 0.40 – 0.63 MCI 15 1800 100 047B3143
CTI 25M 0.63 – 1.0 MCI 15 1800 100 047B3144
CTI 25M 1.0 – 1.6 MCI 15 1800 100 047B3145
CTI 25M 1.6 – 2.5 MCI 15 1800 100 047B3146
CTI 25M 2.5 – 4.0 MCI 15 1800 100 047B3147
CTI 25M 4 – 6.3 MCI 15 1800 4 047B3148
CTI 25M 6.3 – 10 MCI 15 1800 1.5 047B3149
CTI 25M 10 – 16 MCI 15 1800 2.5 ) 047B3150
CTI 25M 14.5 – 20 MCI 25/30 I-O 6300 1.8 047B3151
CTI 25M 18 – 25 MCI 25/30 I-O 6300 1.5 047B3152
CTI 45MB 23 – 32 MCI 50 I-O 25300 6 047B3164
CTI 45MB 32 – 45 MCI 50 I-O 25300 4 047B3165
) Type 2 co-ordination can only be achieved with MCI 25
Motor full load
current
[A] [A2s] [kA]
Soft starter
Type
Be aware of the maximum prospective short circuit
current breaking capacity. For further information
please refer to the data sheet on the circuit breaker.
Soft starter
I2t value
Max. prospective
short-circuit current Icc
for co-ordination 2
Circuit breaker
Code no.
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Data sheet | CI-tronic™ Soft start motor controller, Type MCI 3, MCI 15, MCI 25, MCI 30 I-O, MCI 40-3D I-O and MCI 50-3 I-O
Operation at high
temperatures
If soft starter is used without external bypass contactor:
Ambient
temperature
40 °C 3 15 25 25 29 35
50 °C 2.5 ) 12. 5 20 20 23 30
60 °C 2.0 ) 10 17 17 20 25
) Minimum 10 mm side clearance between products
Ambient
temperature
40 °C
50 °C
60 °C
If soft starter is used with external bypass contactor
Ambient
temperature
40 °C 15 25 30 43 50
50 °C 15 25 30 43 50
60 °C 15 25 30 43 50
MCI 3 MCI 15 MCI 25 MCI 30 I-O MCI 40-3D I-O MCI 50-3 I-O
[A] [A] [A] [A] [A] [A]
Duty-cycle rating (15 min. max. on-time)
MCI 15 MCI 25 MCI 30 I-O MCI 40-3D I-O MCI 50-3 I-O
[A] [A] [A] [A] [A]
15
(100% duty cycle)
15
(80% duty cycle)
15
(65% duty-cycle)25(65% duty-cycle) 25(65% duty-cycle) 43(40% duty-cycle)50(45% duty-cycle)
MCI 25 MCI 25 MCI 30 I-O MCI 40-3D I-O MCI 50-3 I-O
[A] [A] [A] [A] [A]
25
(100% duty cycle)25(100% duty cycle)43(65% duty cycle)50(65% duty cycle)
25
(80% duty cycle)25(80% duty cycle)
Continuous current
43
(50% duty cycle)50(55% duty cycle)
Continuous current
Over heat protection
Mounting Instructions
If required the controller can be protected against
overheating by inserting a thermostat in the slot on the
right-hand side of the controller.
Order: UP 62 thermostat 037N0050
Depending on the application the thermostat can
be connected in series with the control circuit of the
main contactor. When the temperature of the heat sink
exceeds 90 °C the main contactor will be switched OFF.
A manual reset is necessary to restart this circuit.
For wiring connections see application examples page 8.
The controller is designed for vertical mounting. If the
controller is mounted horizontally the load current must
be reduced by 50%.
The controller needs no side clearance.
Clearance between two vertical mounted controller
must be minimum 80 mm (3.15”).
Clearance between controller and top and bottom walls
must be minimum 30 mm (1.2”).
Not with MCI 3
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Data sheet | CI-tronic™ Soft start motor controller, Type MCI 3, MCI 15, MCI 25, MCI 30 I-O, MCI 40-3D I-O and MCI 50-3 I-O
Application examples
Overheat protection
Example 1
The thermostat can be connected in series with the
control input of the soft starter. When the temperature
of the heat sink exceeds 90 °C the soft starter will be
switched OFF.
NOTE:
when the temperature has dropped approx. 30 °C
the controller will automatically be switched ON
again. This is not acceptable in some applications.
Line Controlled Soft start
When the contactor C1 is switched to the ON-State,
the soft starter will start the motor, according to the
settings of the Ramp-up time and Initial torque adjustments.
When the contactor C1 is switched to the OFF-State
the motor will be switched off instantaneously.
In this application the contactor will have no load
during making operation. The contactor will carry
and break the nominal motor current.
Example 2
The thermostat is connected in series with the control
circuit of the main contactor When the temp. of the
heat sink exceeds 90 °C the main contactor will be
switched OFF. This circuit requires manual reset to
restart the motor.
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Data sheet | CI-tronic™ Soft start motor controller, Type MCI 3, MCI 15, MCI 25, MCI 30 I-O, MCI 40-3D I-O and MCI 50-3 I-O
Application examples
(Cont.)
Input controlled soft start
When the control voltage is applied to A1 – A2, the MCI
soft starter will start the motor, according to the
settings of the Ramp-up time and Initial torque
adjustments.
When the control voltage is switched OFF, the motor
will be soft stopped according to the settings of the
Ramp-down time adjustment.
To switch off instantaneously set the Ramp-down time
to 0.
Combined reversing contactor and soft starter
Soft Start & Soft Stop
A soft – reversing of a motor can easily be achieved by
connecting a reversing contactor to the soft starter.
The reversing contactor, type RCI, will determine the
direction of rotation, forward or reverse and the soft
starter, type MCI, will perform soft-starting and softstopping of the motor.
Soft Start only
If soft-stop is not required the application can be
simplified by connecting the control circuit, of the soft
starter, to the main terminals as shown under Line
controlled Soft-Start (see example on page 8).
A delay of approx. 0.5 sec. between forward and reverse
control signal must be allowed to avoid infl uence from
the voltage generated by the motor during turn-off.
Instead of the electronic reversing contactor, type
RCI, an electromechanical reversing contactor can be
applied. Due to the soft starter the reversing contactor
will not be exposed to high inrush currents. As a result a
longer life time of the electromechanical contactor can
be expected.
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Data sheet | CI-tronic™ Soft start motor controller, Type MCI 3, MCI 15, MCI 25, MCI 30 I-O, MCI 40-3D I-O and MCI 50-3 I-O
Application examples
(Cont.)
MCI with bypass contactor
If the MCI soft starter is bypassed during steady state
operation there is no heat dissipation.
A bypassed MCI can be loaded according to tabel page
7: “Operating at high temperatures”.
By means of the integrated auxiliary contact the bypass
function is easily achieved. See wiring diagram below
and “Functional diagram” page 5.
As the contactor always switches in after end of ramp
up time it can be selected on the basis of the thermal
current (AC-1).
MCI 30 I-O
MCI 40-3D I-O
Inside - delta motor
configuration
Bypass
contactor
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Dimensions mm (inch)
MCI 3 MCI 15
MCI 25, MCI 30 I-O
MCI 40-3D I-O
MCI 50-3 I-O
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