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MCD 100 Design Guide
The digitally controlled soft starter features
accurate settings and easy installation. The
controller has individually adjustable acceleration
and deceleration times.
■ Features
• Motor load max. 25 A
• Acceleration times adjustable: 0-10 seconds
• Deceleration times adjustable: 0-10 seconds
• Initial torque adjustable up to 85%
• Breakaway function (kick start)
• Universal control voltage: 24 - 480 V AC / DC
• Automatic detection of missing phases
Thanks to the adjustable initial torque and the unique
breakaway (kick start) function the soft starter can
be optimized for almost any application.
The MCD 100 soft starters are typically used on
motor applications where a smooth stat and/or
stop is advantageous, such as conveyors, fans,
pumps, compressors and high inertia loads.
MCD 100 soft starters are also obvious as
replacement for star/delta starters.
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MCD 100 Design
Guide
■ Introduction
The MCD 100 soft starters are designed for soft starting
and stopping of 3 phase a.c. motors, thus reducing
the inrush current and eliminating the damaging
effects of high starting torque surges.
Automatic adaptation to 50/60 Hz
LED Status indication
Unlimited start/stop operations per hour
Built in varistor protection
Compact modular design
DIN rail mountable
CE (EN 60947-4-2)
CULUS (UL 508)
■ Adjustments
■ Selection Guide
Type
MCD
MCD
MCD
MCD
MCD
MCD
MCD
MCD
MCD
MCD
100-001
100-001
100-001
100-001
100-007
100-007
100-007
100-011
100-011
100-011
Max. power
0,75 kW
1,5 kW
1,5 kW
2,2 kW
4 kW
7,5 kW
7,5 kW
7,5 kW
11 kW
15 kW
Max. FLC
3A
3A
3A
3A
15 A
15 A
15 A
25 A
25 A
25 A
MG.12.A1.02 - VLT is a registered Danfoss trademark
Voltage
208 - 240
400 - 415
440 - 480
550 - 600
208 - 240
400 - 480
500 - 600
208 - 240
400 - 480
500 - 600
V
V
V
V
V
V
V
V
V
V
DD order code
175G4000
175G4001
175G4002
175G4003
175G4004
175G4005
175G4006
175G4007
175G4008
175G4009
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MCD 100 Design Guide
■ Technical Data
Output specifications
MCD 100 - 001
MCD 100 - 007
MCD 100 - 011
Operational current max.
3A
15A
25A
208 - 240 V AC
0.1-0.75 kW (0.18-1 HP)
0.1-4.0 kW (0.18-5.5 HP)
0.1-7.5 kW (0.18-10 HP)
400 - 480 V AC
0.1-1.5 kW (0.18-2 HP)
0.1-7.5 kW (0.18-10 HP)
0.1-11 kW (0.18-15 HP)
550 - 600 V AC
0.1-2.2 kW (0.18-3 HP)
0.1-7.5 kW (0.18-10 HP)
0.1-15 kW (0.18-20 HP)
Motor size at:
Leakage current max.
5 mA
Min. operational current
50 mA
Ratings:
AC-53a Asynchronous motors
-
15A : AC-53a : 8-3 :100 - 3000
25A : AC-53a : 6-5 : 100 - 480
AC-53b Asynchronous motors with bypass
3A : AC-53b : 5-5 : 10
-
-
AC-58a Hermetic refrigeration compressors
-
15A : AC-58a : 6-6 : 100 - 3000
25A : AC-58a : 6-6 : 100-480
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
1 mA
Control current / Power max.
15 mA / 2 VA
Response time max.
70 ms
Ramp-up time
Adjust. from 0-10 sec.
Ramp-down time
Adjust. from 0-10 sec.
Initial torque
Adjust from 0-85% of nominal torque with optional, Kick start.
EMC immunity and emission
Meets requirements of EN 60947-4-2
Insulation
Rated insulation Voltage, Ui
660 V AC
Rated impulse withstand Voltage, Uimp
4 kV
Installation Category
III
Thermal Specifications
MCD 100 - 001
MCD 100 - 007
MCD 100 - 011
Power dissipation continuous duty max.:
4W
2W/A
Power dissipation intermittent duty max.:
4W
2W/A x Duty cycle
Ambient temperature range
-5°C to 40°C
Cooling method
Natural convection
Mounting
Vertical +/- 30°
Max. ambient temperature with limited
60°C, see derating for high temperatures in paragraph Operating at High Temperatures.
rating
Storage temp. range
-20°C to 80°C
Protection degree/pollution degree
IP 20 / 3
Materials
2
Housing
Self extinguishing PPO UL94V1
Heatsink
Aluminium black anodized
Base
Electroplated steel
MG.12.A1.02 - VLT is a registered Danfoss trademark
MCD 100 Design Guide
Example 1:
Example 2:
Soft start and soft stop
Soft start with kick start and soft
stop
■ Functional Description
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 the application will need a high break-away
torque. Here, the initial starting torque level 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
Stand
Ramp
by
up
Full on
Ramp down
Line on
load error
■ Wiring
MCD 100 - 007 / MCD 100 - 011
MG.12.A1.02 - VLT is a registered Danfoss trademark
3
MCD 100 Design
Guide
■ Functional Diagram
MCD 100 Design Guide
■ Adjustments
MCD 100 provide Timed Voltage Ramp up. This means
that the motor voltage is gradually ramped up to full line
voltage according to the time set by the rotary switch.
2. Set initial torque switch to min.
3. Apply control signal for a few seconds. If the
motor does not rotate immediately increase the
initial torque level with on step and try again.
Repeat until the motor starts to rotate immediately
after control signal is applied.
To avoid soft starter damage, proper settings of initial
torque level and ramp up time must be considered. It
is important to ensure that the motor is accelerated to
full speed before the soft starter is in full on mode.
Setting the ramp up time:
1. Set ramp up time to max.
2. Decrease the ramp up time until mechanical
surge is observed.
3. Increase ramp up time with one step.
Setting the initial torque level:
1. Set ramp up time to max.
■ Fuses and short circuit protection
In case of short circuits normal fuses can be
used to protect the installation – but not the
MCD 100-001
MCD 100-007
MCD 100-011
Protection max 25 A gL/gG
Protection max 50 A gL/gG
Protection max 80 A gL/gG
Semiconductor fuses may be used with MCD 100
soft start controllers. Use of semiconductor fuses will
protect the SCR’s in case of short circuits and reduce
the potential of SCR damage due to transient overload
MCD 100
MCD 100-001
MCD 100-007
MCD 100-011
4
soft starter. The following table lists data for
the selection of normal fuses.
currents. When selecting semiconductor fuses ensure
that the fuse has a lower total clearing I2t rating than the
SCR (see data in the following table), and that the fuse
can carry the start current for the actual start duration.
SCR I2t
(A2s)
72
1800
6300
MG.12.A1.02 - VLT is a registered Danfoss trademark
MCD 100 Design Guide
MCD 100 Design
Guide
■ Dimensions
MCD 100 - 001
MCD 100 - 007
MG.12.A1.02 - VLT is a registered Danfoss trademark
5
MCD 100 Design Guide
MCD 100 - 011
6
MG.12.A1.02 - VLT is a registered Danfoss trademark
MCD 100 Design Guide
■ Operating at High Temperatures
Ambient temperature
40°C
50°C
60°C
MCD 100 - 001
3A
2.5 A*
2.0 A*
Continous current
MCD 100 - 007
15 A
12.5 A
10 A
MCD 100 - 011
25 A
20 A
17 A
Ambient temperature
40°C
50°C
60°C
MCD 100 Design
Guide
* Minimum 10 mm side clearance between products
Duty-cycle rating (15 min. max. on-time)
MCD 100 - 007
MCD 100 - 011
15 A (100 % duty-cycle)
25 A (100 % duty-cycle)
15 A (80 % duty-cycle)
25 A (80 % duty-cycle)
15 A (65 % duty-cycle)
25 A (65 % duty-cycle)
■ Over Heat Protection
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 paragraph
Application Examples.
■ Mounting Instructions
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 controllers
must be minimum 80 mm (3.15").
Clearance between controller and top and bottom
walls must be minimum 30 mm (1.2").
MG.12.A1.02 - VLT is a registered Danfoss trademark
7
MCD 100 Design Guide
■ 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 exceedes 90°C the
soft starter will be switched OFF.
NB!:
When the temperature has dropped
approximately 30°C the controller will
automatically be switched On again. This
is not acceptable in some applications.
Example 2
The thermostat is 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. This circuit
requires manual reset to restart the motor.
■ Line Controlled Soft Start
When the contractor 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.
8
MG.12.A1.02 - VLT is a registered Danfoss trademark
MCD 100 Design Guide
■ Input Controlled Soft Start
When the control voltage is applied to A1 - A2, the MCD
soft starter will start the motor, according to the settings
of the Ramp-up time and Initial torque adjustments.
MCD 100 Design
Guide
When the control voltage is switched OFF, the motor
will be soft stopped according to the settings of
the Ramp-down time adjustments.
To switch off instantaneously set the
Ramp-down time to 0.
MG.12.A1.02 - VLT is a registered Danfoss trademark
9
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