The VLT® Soft Starter MCD 500 is an advanced digital soft
start solution for 11–850 kW (15–1150 hp) motors. The soft
starters provide a complete range of motor and system
protection features and are designed for reliable
performance in the most demanding installation situations.
1.1.1 Document Version
This operating guide is regularly reviewed and updated. All
suggestions for improvement are welcome. Table 1.1 shows
the document version.
EditionRemarks
MG17K8xxInstruction about using nger guard kits for IP00
installations added to chapter 4 Electrical Installation.
Indicates a potentially hazardous situation that could
result in death or serious injury.
CAUTION
Indicates a potentially hazardous situation that could
result in minor or moderate injury. It can also be used to
alert against unsafe practices.
NOTICE
Indicates important information, including situations that
can result in damage to equipment or property.
2.1.1 Qualied Personnel
Correct and reliable transport, storage, installation,
operation, and maintenance are required for the troublefree and safe operation of the soft starter. Only qualied
personnel are allowed to install or operate this equipment.
Qualied personnel is dened as trained sta, who are
authorized to install, commission, and maintain equipment,
systems, and circuits in accordance with pertinent laws and
regulations. Additionally, the personnel must be familiar
with the instructions and safety measures described in this
manual.
WARNING
ELECTRICAL SHOCK HAZARD
VLT® Soft Starter MCD 500 contains dangerous voltages
when connected to mains voltage. Only a qualied
electrician should carry out the electrical installation.
Improper installation of the motor or the soft starter can
cause death, serious injury, or equipment failure. Follow
the guidelines in this manual and local electrical safety
codes.
Models MCD5-0360C ~ MCD5-1600C:
Treat the busbar and heat sink as live parts whenever
the unit has mains voltage connected (including when
the soft starter is tripped or waiting for a command).
WARNING
PROPER GROUNDING
Disconnect the soft starter from mains voltage before
carrying out repair work.
It is the responsibility of the person installing the soft
starter to provide proper grounding and branch circuit
protection according to local electrical safety codes.
Do not connect power factor correction capacitors to the
output of the VLT® Soft Starter MCD 500. If static power
factor correction is employed, it must be connected to
the supply side of the soft starter.
WARNING
IMMEDIATE START
In auto-on mode, the motor can be controlled remotely
(via remote inputs) while the soft starter is connected to
mains.
MCD5-0021B ~ MCD5-0961B:
Transportation, mechanical shock, or rough handling
may cause the bypass contactor to latch into the On
state.
To prevent the motor from starting immediately on rst
commissioning or operation after transportation:
Always ensure that the control supply is applied
•
before the power.
Applying control supply before power ensures
•
that the contactor state is initialized.
WARNING
UNINTENDED START
When the soft starter is connected to AC mains, DC
supply, or load sharing, the motor can start at any time.
Unintended start during programming, service, or repair
work can result in death, serious injury, or property
damage. The motor can start with an external switch, a
eldbus command, an input reference signal from the
LCP or LOP, via remote operation using MCD PC
Software, or after a cleared fault condition.
To prevent unintended motor start:
Press [O]/[Reset] on the LCP before
•
programming parameters.
Disconnect the soft starter from mains.
•
Completely wire and assemble the soft starter,
•
motor, and any driven equipment before
connecting the soft starter to AC mains, DC
supply, or load sharing.
The soft starter is not a safety device and does not
provide electrical isolation or disconnection from the
supply.
If isolation is required, the soft starter must be
•
installed with a main contactor.
Do not rely on the start and stop functions for
•
safety of personnel. Faults occurring in the
mains supply, the motor connection, or the
electronics of the soft starter can cause
unintended motor starts or stops.
If faults occur in the electronics of the soft
•
starter, a stopped motor may start. A temporary
fault in the supply mains or loss of motor
connection can also cause a stopped motor to
start.
To provide safety of personnel and equipment, control
the isolation device through an external safety system.
NOTICE
Before changing any parameter settings, save the current
parameter to a le using MCD PC Software or the Save
User Set function.
NOTICE
Use the autostart feature with caution. Read all the notes
related to autostart before operation.
The examples and diagrams in this manual are included
solely for illustrative purposes. The information contained
in this manual is subject to change at any time and
without prior notice. Responsibility or liability is never
accepted for direct, indirect, or consequential damage
resulting from the use or application of this equipment.
The soft starter always responds to a local start or stop
command (via the [Hand On] and [O] keys on the LCP).
Pressing the [Auto On] key selects remote control (the soft
starter accepts commands from the remote inputs). In
remote mode, the Auto On LED is on. In hand-on mode,
the Hand On LED is on if the soft starter starts or runs. The
O LED is on if the soft starter is stopped or stops.
NOTICE
SELV oers protection by way of extra low voltage.
Protection against electric shock is ensured when the
electrical supply itself is of the SELV type and the installation follows local/national regulations on SELV supplies.
NOTICE
Galvanic (ensured) isolation is obtained by fullling
requirements for higher isolation and by providing the
relevant creepages/clearance distances. These
requirements are described in the IEC 61140 standard.
The components that make up the electrical isolation
also comply with the requirements for higher isolation
and the relevant test as described in IEC 61140.
4.1.3 Remote Inputs
4.1.2 Control Terminals
Control terminations use 2.5 mm2 (14 AWG) plug-in
terminal blocks. Dierent models require control voltage to
dierent terminals:
CV1 (24 V AC/V DC): A5, A6.
•
CV2 (110–120 V AC): A5, A6.
•
CV2 (220–240 V AC): A4, A6.
•
The soft starter has 3 xed inputs for remote control.
Control these inputs by contacts rated for low voltage, low
current operation (gold ash or similar).
12-wire control
23-wire control
34-wire control
Illustration 4.2 2-, 3-, and 4-wire Control
Illustration 4.1 Wiring to Control Terminals
The reset input can be normally open or normally closed.
NOTICE
Do not short terminals 05 and 06 without using a
thermistor.
To select the conguration, use parameter 3-8 Remote Reset
Logic.
WARNING
All control terminals and relay terminals comply with SELV
(safety extra low voltage). This protection does not apply
to grounded delta leg above 400 V.
To maintain SELV, all connections made to the control
terminals must be PELV (for example thermistor must be
reinforced/double insulated from motor).
Do not apply voltage to the control input terminals.
These terminals are active 24 V DC inputs and must be
controlled with potential-free contacts.
Segregate cables to the control inputs from
•
mains voltage and motor cabling.
177HA646.10
177HA647.10
177HA648.10
177HA649.10
5 mm
15 mm
28 mm
11 mm
(M10)
177HA643.10
6 mm
15 mm
28 mm
11 mm
(M10)
177HA644.10
13 mm
12 mm
32 mm
11 mm
(M10)
177HA645.10
Electrical InstallationOperating Guide
4.1.4 Serial Communication
Control via the serial communication network is always
enabled in hand-on mode and can be enabled or disabled
in remote control mode (see parameter 3-2 Comms inRemote). Control via the serial communication network
requires an optional communication module.
4.1.5 Ground Terminal
Ground terminals are at the back of the soft starter.
MCD5-0021B to MCD5-0105B have 1 terminal on
•
the input side (top).
MCD5-0131B to MCD5-0961B and MCD5-0245C to
•
MCD5-1600C have 2 terminals; 1 on the input
side (top), and 1 on the output side (bottom).
Cable size: 6–50 mm2 (AWG 10-1/0)
Torque: 4 Nm (35.4 in-lb)
MCD5-0021B to MCD5-0105B
38 Nm (336.3 in-lb)
4.1.6 Power Terminations
NOTICE
For personnel safety, snap-o tabs protect the power
terminals on models up to MCD5-0105B. When using
large cables, it may be necessary to break o these tabs.
NOTICE
Some units use aluminum busbars. When connecting
power terminations, clean the surface contact area
thoroughly (using an emery or stainless steel brush), and
use an appropriate jointing compound to prevent
corrosion.
Use only copper stranded or solid conductors, rated for
75 °C (167°F) or higher.
14 mm (0.55 in)
Torx T20 x 150
Flat 7 mm x 150
44
MCD5-0131BMCD5-0141B to MCD5-0215BMCD5-0245B
38 Nm (336.3 in-lb)38 Nm (336 in-lb)
MCD5-0331B to MCD5-0396BMCD5-0469B to MCD5-0961BMCD5-0245C
MCD5-0360C to MCD5-0927CMCD5-1200C to MCD5-1600C
Table 4.1 Measurements and Torques for Power Terminations
When installing IP00 soft starters (MCB5-131B and
above), nger guards are specied for personnel safety.
Finger guards t over the soft starter terminals to
prevent accidental contact with live terminals. Finger
guards provide IP20 protection when correctly installed.
44
MCD5-0131B to MCD5-0215B: 175G5662.
•
MCD5-0245B to MCD5-0396B: 175G5730.
•
MCD5-0469B to MCD5-0961B: 175G5731.
•
MCD5-245C: 175G5663.
•
MCD5-0360C to MCD5-0927C: 175G5664.
•
MCD5-1200C to MCD5-1600C: 175G5665.
•
Illustration 4.3 MCD5-0021B to MCD5-0105B, 21–105 A
NOTICE
To be UL-compliant, the models MCD5-0131B to
MCD5-0396B require nger guards.
4.2 Power Input and Output Congurations
4.2.1 Internally Bypassed Models
(MCD5-0021B to MCD5-0961B)
Models MCD5-0021B to MCD5-0215B have power inputs at
the top of the unit and outputs at the bottom of the unit.
Internally bypassed models MCD5-0245B to MCD5-0396B
have output busbars at the bottom of the unit and input
busbars at both the top and bottom. The AC supply can
be connected:
Top-in/bottom-out.
•
Bottom-in/bottom-out
•
Internally bypassed models MCD5-0469B to MCD5-0961B
have input and output busbars at the top and bottom of
the unit. The AC supply can be connected:
Top-in/bottom-out.
•
Top-in/top-out.
•
Bottom-in/bottom-out.
•
Bottom-in/top-out.
•
Illustration 4.4 MCD5-0131B to MCD5-0215B, 131–215 A
Illustration 4.5 MCD5-0245B to MCD5-0396B, 245–396 A
20.0
2/T1 4/T2 6/T3
1/L1 3/L2 5/L3
2/T1 4/T2 6/T3
1/L1 3/L2 5/L3
177HA650.11
177HA651.10
1/L1 3/L2 5/L3
T1B T2B T3B
2/T1 4/T2 6/T3
(L1B L2B L3B)
1/L1 3/L2 5/L3
2/T1 4/T2 6/T3
1/L1 3/L2 5/L3
(L1B L2B L3B)
2/T1 4/T2 6/T3
(L1B L2B L3B)
1/L1 3/L2 5/L3
2/T1 4/T2 6/T3
1/L1 3/L2 5/L3
(L1B L2B L3B)
2/T1 4/T2 6/T3
177HA652.10
Electrical InstallationOperating Guide
Illustration 4.6 MCD5-0469B to MCD5-0961B, 469–961 A
4.2.3 MCD5-0360C to MCD5-1600C
MCD5-0360C to MCD5-1600C have dedicated bypass
terminals on the input busbars. The bypass terminals are:
L1B.
•
L2B.
•
L3B.
•
The busbars on non-bypassed models MCD5-0360C to
MCD5-1600C can be adjusted for top or bottom input and
output as required. See chapter 12 Busbar AdjustmentProcedure (MCD5-0360C to MCD5-1600C) for step-by-step
instructions. The soft starters are manufactured top-in/
bottom-out.
NOTICE
For models MCD5-0360C to MCD5-1600C to be ULcompliant, mount them top-in/bottom-out, or top-out/bottom-in. See chapter 11.1 UL-compliant Installation for
more information.
44
4.2.2 MCD5-0245C
MCD5-0245C has dedicated bypass terminals at the bottom
of the unit. The bypass terminals are:
T1B.
•
T2B.
•
T3B.
•
Illustration 4.7 Bypass Terminals on MCD5-0245C, 245 A
Illustration 4.8 Location of Bypass Terminals, MCD5-0360C to
MCD5-1600C, 360–1600 A
4.3 Motor Connection
VLT® Soft Starters MCD 500 can be connected to the
motor in-line or inside delta (also called 3-wire and 6-wire
connection). When connecting in inside delta, enter the
motor full load current (FLC) in parameter 1-1 Motor FullLoad Current. The MCD 500 automatically calculates inside
delta current based on this data. Parameter 15-7 MotorConnection is set to Auto Detect as default and can be set
to force the soft starter in inside delta or in-line.
The VLT® Soft Starter MCD 500 can be connected to a
small motor for testing. During this test, the control input
and relay output protection settings can be tested. This
test mode is not suitable for testing soft starting or soft
stopping performance.
44
The minimum FLC of the test motor is 2% of the minimum
FLC of the soft starter (see chapter 4.5 Minimum andMaximum Current Settings).
NOTICE
When testing the soft starter with a small motor, set
parameter 1-1 Motor FLC to the minimum allowable
value.
Models which are internally bypassed do not require an
external bypass contactor.
4.3.2 In-line Installation
4.3.2.1 Internally Bypassed
K1Main contactor (optional)
F1
1) To keep the warranty on the SCRs, use semiconductor fuses.
Non-bypassed models have dedicated bypass terminals,
which allow the soft starter to continue providing
protection and monitoring functions even when bypassed
via an external contactor. Connect the bypass contactor to
the bypass terminals and control it by a programmable
output congured to Run (see parameters 4-1 to 4-9).
NOTICE
The bypass terminals on MCD5-0245C are:
T1B.
•
T2B.
•
T3B.
•
The bypass terminals on MCD5-0360C to MCD5-1600C
are:
L1B.
•
L2B.
•
L3B.
•
If necessary, the fuses can be installed on the input side.
When connecting the VLT® Soft Starter MCD 500 in
inside delta conguration, always install a main
contactor or shunt trip circuit breaker.
NOTICE
When connecting in inside delta, enter the motor full
load current (FLC) in parameter 1-1 Motor FLC. The MCD
500 automatically calculates inside delta currents based
on this data. Parameter 15-7 Motor Connection is set to
Auto detect as default and can be set to force the soft
starter in inside delta or in-line.
44
K1Main contactor
K2Bypass contactor (external)
F1
Semiconductor fuses (optional)
1)
1) To keep the warranty on the SCRs, use semiconductor fuses.
1) To keep the warranty on the SCRs, use semiconductor fuses.
4.3.3.3 Externally Bypassed
Non-bypassed models have dedicated bypass terminals,
which allow the soft starter to continue providing
protection and monitoring functions even when bypassed
via an external bypass contactor. Connect the bypass
contactor to the bypass terminals and control the
contactor by a programmable output congured to Run
(see parameters 4-1 to 4-9).
NOTICE
The bypass terminals on MCD5-0245C are:
T1B.
•
T2B.
•
T3B.
•
The bypass terminals on MCD5-0360C to MCD5-1600C
are:
L1B.
•
L2B.
•
L3B.
•
If necessary, the fuses can be installed on the input side.