Power Electronics VS65 Series User manual

Medium Voltage Soft Starter
Hardware and Installation Manual

Medium Voltage Soft Starter
Hardware and installation Manual
Edition: July 2012
VS65MTHW01AI Rev. A

VS65 SERIES MV SOFT STARTER
POWER ELECTRONICS
2

POWER ELECTRONICS
VS65 SERIES MV SOFT STARTER
3
SAFETY SYMBOLS
In order to reduce the risk of personal injury, electric shock, fire and damage to equipment, please read
carefully and pay attention to the precautions found in this manual.
July 2012 Edition
This publication could show technical imprecision or misprints. The information here included would be
periodically modified and updated, included in later editions. To consult or download the latest information
related to this product, please contact our website www.power-electronics.com.
ALARM
SAFETY
WARNING
This symbol indicates the presence of potential hazard, which may
result in serious personal injury when instructions are omitted or not
followed properly.
CAUTION
Identifies shock hazards under certain conditions. Particular
attention should be given due to the presence of dangerous voltage.
Maintenance operations should be carried out by qualified
personnel.
Identifies potential hazards under certain conditions. Read the
message and follow the instructions carefully.
Identifies electric shock hazards under certain conditions. Particular
attention should be given due to the presence of dangerous voltage.

VS65 SERIES MV SOFT STARTER
POWER ELECTRONICS
4
REVI
SION
CONTROL
DATE
REVI
SION
DESCRIP
T
IO
N
12
Ju
ly
201
2
A
First
Ed
it
i
o
n
The equipment and technical documentation is periodically updated. Power electronics reserves the right to modify all or part of the
contents within the manual without previous notice.

POWER ELECTRONICS
VS65 SERIES MV SOFT STARTER
INDEX
5
INDEX
SAFETY INSTRUCTIONS........................................................................................................... 7
1. INTRODUCTION .................................................................................................................. 11
2. CONFIGURATION TABLE & STANDARD RATINGS......................................................... 12
2.1. Configuration table..................................................................................................... 12
2.2. Standard Ratings....................................................................................................... 13
3. TECHNICAL CHARACTERISTICS...................................................................................... 15
3.1. Topology.................................................................................................................... 17
3.2. Operating Principles................................................................................................... 18
3.3. Connection Diagrams................................................................................................. 19
4. DIMENSIONS....................................................................................................................... 21
5. HANDLING, TRANSPORTATION AND INSTALLATION.................................................... 22
5.1. Environmental ratings ................................................................................................ 22
5.2. Reception and Storage .............................................................................................. 22
5.3. Handling and Transportation...................................................................................... 22
5.4. Installation requirements............................................................................................ 24
5.5. EMC Emissions/Immunity and noise levels................................................................ 24
6. WIRING ACCESS AND CONNECTION............................................................................... 25
6.1. Electrical Protections.................................................................................................. 25
6.2. Wiring Access............................................................................................................ 28
6.3. Power and PE terminals ............................................................................................ 30
6.4. Wiring recommendations ........................................................................................... 31
6.5. Control terminals........................................................................................................ 32
6.6. Direct on-line start...................................................................................................... 33
7. INTERFACE ......................................................................................................................... 34
7.1. Upper door pilots and indicators ................................................................................ 34
7.2. Alphanumeric Display ................................................................................................ 34
7.3. Lower door pushbuttons and pilots............................................................................ 35
7.4. Front and rear doors .................................................................................................. 36
8. CONFIGURATION, LOW VOLTAGE TRIAL AND COMMISSIONING................................ 37
8.1. Before Commissioning Observations......................................................................... 37
8.2. Low voltage Trial........................................................................................................ 38
8.3. Medium voltage Commissioning ................................................................................ 43
9. PREVENTIVE MAINTENANCE............................................................................................ 44
DECLARATION OF CONFORMITY CE...................................................................................... 46
ANNEX A: ELECTRIC DIAGRAMS............................................................................................ 47

VS65 SERIES MV SOFT STARTER
POWER ELECTRONICS
6

POWER ELECTRONICS
VS65 SERIES MV SOFT STARTER
SAFETY INSTRUCTIONS
7
SAFETY INSTRUCTIONS
IMPORTANT!
The safety measures shown in the manual are intended to teach the user to use the product properly and
as safely as possible to prevent any personal injury or material damage.
DANGER CAUTION ALARM
DANGEROUS VOLTAGE
The medium voltage soft starters
have dangerous voltages when
connected to line voltage. Install
and maintenance operations
should be carried out by qualified
personnel only.
An improper motor or soft starter
installation may cause faults in the
equipment, serious injuries
including death. Follow carefully
the instructions given in the
manual, the national electric
codes and updated local codes.
SHORT CIRCUIT
Medium Voltage soft starters are
not tested against short circuits.
In case of a severe overload or
short circuit, the soft starter should
be completely tested to keep the
equipment in working order.
GENERAL PROTECTIONS
AND EARTH GOUNDING.
The installer or user is
responsible to provide a proper
soft starter earthing system and
a complete protections system in
accordance with the national
electric codes and updated local
codes.
ALARM – SAFETY – CAUTION
Read carefully this manual and follow the instructions before proceeding.
All of the safety instructions would not cover every single potential equipment cause. However, the most
common and important ones have been pointed out. The installer should follow the instructions described
within the manual, provide quality electric work and localize all of the recommendations and warnings
provided before starting the equipment.
Make sure the
soft starter
is completely disconnected from the power supply and earth grounded
before any use or maintenance operation is carried out.
Check the maintenance section before proceeding. In order to prevent electric risks, disconnect the power
supply input, earth ground the equipment and remove the control voltages before working in the
equipment. Warning and safety labels should be properly placed in terminals, covers and control panels
in accordance with local codes. Otherwise, electric shock hazard exists.
Do not connect any kind of power supply to the equipment while the doors are opened.
Totally prohibited to run the soft starter with the doors opened.
Once doors are properly closed, the power supply may be connected to the equipments power supply
line. Otherwise, electric shock hazard exists.
Do not open the
soft starter
doors except for periodic
inspections
, wiring the unit even when the
input voltage is not connected.
Otherwise, you may suffer an electric shock.

VS65 SERIES MV SOFT STARTER
POWER ELECTRONICS
8
SAFETY INSTRUCTIONS
ALARM – SAFETY – CAUTION
Power factor compensation capacitors.
The reactive compensation capacitors used to increase the power factor should be connected to the soft
starter input terminals and not to the output ones. These capacitors should be connected with an
additional contactor as shown in the electric connections section. The connection will be done only when
the soft starter is running and it will be disconnected during the acceleration and deceleration ramp.
Otherwise, the soft starter can be damaged.
When working in electric installations always remember to apply the 5 golden rules:
1. Visible cut of all the voltage sources.
2. Mechanic lock of every single cut elements.
3. Verify no voltage is present.
4. Earth ground and short circuit any possible voltage source.
5. Define and post sign the working area.
CAUTION
Handle the equipment with dry
hands
.
Otherwise, electric shock hazard existence.
Do not use cables w
ith
damaged insulation.
Do not summit cables to abrasions, excessive stress,
heavy loads or pinching.
Otherwise, electric shock hazard existence.
Keep clean the equipment,
not allowing lint, paper, wooden chips, dust, metallic chips or other
foreign matter (screws, pressure washers…) into the soft starter. Verify this point after the
installation.
Otherwise, accident and fire risk existence.
Place the
soft starter
over non
-
flammable surface. Keep away from flammable material
s
.
Otherwise, fire risk existence.
Disconnect and earth ground the
soft starter
power input when the
soft starter
is damaged.
Otherwise, fire and secondary accident risk existence.
After applying input voltage or after removing it, the
soft starter
will remain warm for a couple of
minutes.
Otherwise, body injury or skin burn risk existence.
Do not apply voltage to a damaged or
soft starter
with parts missing
even if the installation
is
complete.
Otherwise, electric shock hazard existence.
Do not e
xchange the
soft starter
input an
d output power connections.
Otherwise, excessive voltage could be found in the logic control circuit.

POWER ELECTRONICS
VS65 SERIES MV SOFT STARTER
SAFETY INSTRUCTIONS
9
SAFETY
COMMISSIONING
Before commissioning the soft starter, the user must read carefully this manual and pay particular
attention to the connection and start sections.
Verify all of the parameters and make the necessary settings before starting the equipment.
Depending on load and applications, the parameter values can be changed.
Voltage and current levels applied in terminals as external signs should be in accordance with the
manual data. Otherwise, the soft starter could be damaged.
GROUND CONNECTIONS
Electric shock prevention:
The soft starter locker chassis must be properly earth ground connected to prevent a possible electric
shock even when a leakage current flows through the locker. Disconnect all of the voltage supplies
before proceeding with maintenance operations within the soft starter or motor. Due to the existence
of capacitors in the power section, the equipment will keep dangerous voltage even when the input
voltage is disconnected. Use a cable to earth-ground it and discharge the existing voltage.
Only connect the earth grounding to the soft starter earth plate. Do not use the case or the chassis
screw for grounding.
The earth protection cable must be connected first and disconnected last.
The motor earth grounding will be connected to the soft starters’ one and not to the installations one.
The installations earth grounding will be connected to the soft starters’ one.
Equipment input cables are medium voltage cables. As shown in the figure, they are coaxial cables,
each one including earth. To carry out with a correct connection it is necessary to join every phase’s
earth and connect it to the soft starters’ earth plate.
The output cables to the motor have the same characteristics. Their earths should also be joined and
connected to the soft starters earth plate IN THE SAME TERMINAL than the input cables.
After a short-circuit occurrence, examine the ground connection circuit because it can be damaged
and probably some or all the parts need to be replaced.

VS65 SERIES MV SOFT STARTER
POWER ELECTRONICS
10
SAFETY INSTRUCTIONS
WARNINGS
RECEPTION
The VS65 Series soft starters are handled carefully, tested and perfectly packed before delivering.
In the event of transport damage, please ensure that you notify the transport agency and Power
Electronics: 902 40 20 70 (International + 34 96 136 65 57).
UNPACKING
Verify model and serial number of the soft starter is the same on the box, delivery note and unit.
Each soft starter is supplied with an installation manual.
RECICLYING
Packing of the equipments should be recycled. Therefore, it is necessary to separate materials included
(plastic, paper, cardboard, Wood….) and deposit them on proper recycling banks.
Waste products of electric and electronic devices should be selectively collected for their correct
environmental management.
SAFETY
Before starting the soft starter, read this manual completely to gain an understanding of the unit. In case
of doubt, please contact Power Electronics (902 40 20 70 / [phone]) or your nearest agent.
Wear safety goggles when operating the soft starter with voltage.
Handle the equipment in accordance with the soft starters’ weight.
Proceed with the installation according to the instructions found in this manual.
Do not stack the soft starter or place heavy objects on the soft starter.
Ensure that the soft starter is correctly installed considering the recommendations within this manual.
Do not drop the soft starter or to impact exposure.
The VS65 Series soft starters contain static-sensitive printed circuit boards. Use static safety procedures
when handling boards.
Avoid installing the soft starter in different conditions from those described in the Technical
Characteristics section.

POWER ELECTRONICS
VS65 SERIES MV SOFT STARTER
INTRODUCTION
11
1. INTRODUCTION
The VS65 Medium Voltage Soft starter has been designed to start, stop, protect and control medium
voltage AC motors. The VS65 integrates as standard SCR stacks, Snubber circuit, trigger circuit, line and
bypass vacuum contactors, fiber optics interconnections and control board, and a easy user interface, that
make the VS65 MV Soft starter the most complete, reliable and safety soft starter.
Additionally, its modular design permits to integrate additional features such as fuses, ground fault
monitoring relay, metal-clad systems, circuit breakers, etc.
STANDARD FEATURES
User friendly Alphanumeri Display
Multiple motor prote tion options: Input phases sequen e, High Voltage, Input Low Voltage, Start urrent limit, Rotor lo ked,
Motor
overload (thermal model), Under load, Unbalan ed phases , Shearpin urrent, Maximum number of starts/hour, water hammer
ontrol, PTC input.
Complete soft starter prote tion: SCR overheat, Ex essive start time (max 120s), Input phase loss.
Modbus field Bus standard and optional digital and analogue I/O
In Line and Bypass va uum onta tors
Multiple ontrol push buttons and indi ators
Multiple starting and stopping modes
Dual setting pre- onfiguration
Lo al and remote start and stop
OPTIONAL FEATURES
Over urrent prote tion with fuses or Automati Cir uit Breaker
Ground fault monitoring relay
Power Stage and prote tions Metal-Clad system
IP54 Degree of prote tion
Communi ation proto ols (Profibus DP, Devi enet, Ethernet, N2 Metasys, others)
Figure 1.1:VS65 soft starter

VS65 SERIES MV SOFT STAR
TER
POWER ELECTRONICS
12
CONFIGURATION TABLE & STANDARD RATINGS
2. CONFI URATION TABLE & STANDARD
RATIN S
2.1. Configuration table
Example of the selection table module soft starter VS65
CODE: VS6520064CLT
VS65 200 6 4 CL T - -
VS65
Series
Output
current
[1]
Input
voltage
Protection
degree Configuration Power cable access Fuses Metal-Clad
200 200ª 2 2300V 4 IP41 CL Fixed line
onta tor - Bottom input and output onne tion - No fuses - Without Metal-Clad
400 400ª 3 3000V
3300V 5
[3]
IP54 CX Removable
line onta tor T
Top input a
nd
bottom output
onne tion
F
[3]
With
fuses M
[3]
With Metal-
Clad
… … 4 4160V C
[2]
Without line
onta tor U Top input and output onne tion
6 6000V
6600V
8 10000V
11000V
- Under
request
Notes:
[1] Check the rated current of the motor nameplate to guarantee the compatibility with the selected
soft starter.
[2] In these cases it is required an additional input protection cell.
[3] Consult availability with Power Electronics.

POWER ELECTRONICS
VS65 SERIES MV SOFT STARTER
CONFIGURATION TABLE & STANDARD RATINGS
13
2.2. Standard ratings
MODELS VS65 2.3kV
CODE NOMINAL
CURRENT (A) MOTOR POWER
(kW) [1] (HP)
VS65040 2
40
149
200
VS65050 2
50
186
250
VS65060 2
60
224
300
VS65070 2
70
261
350
VS65090 2
90
298
400
VS65100 2
100
336
450
VS65110 2
110
373
500
VS65130 2
130
447
600
VS65150 2
150
522
700
VS65
170 2
170
597
800
VS65190 2
190
671
900
VS65210 2
210
746
1000
VS65270 2
270
932
1250
VS65320 2
320
1119
1500
VS65370 2
370
1305
1750
VS65420 2
420
1491
2000
VS65480 2
480
1678
2250
VS65530 2
530
1864
2500
VS65590 2
590
2051
2750
VS65640 2
640
22
37
3000
VS65740 2
740
2610
3500
[ 1] kW standard motor rated power (cos φ= 0.88,
2.3kV)
MODELS VS65 3kV – 3.3kV
CODE NOMINAL
CURRENT (A) MOTOR POWER
(kW) [2] (HP)
VS65040 3 40 200 268
VS65050 3
50
250
335
VS65060 3
60
315
422
VS65070 3
70
355
476
VS65080 3
80
400
536
VS65090 3
90
450
603
VS65100 3 100 500 670
VS65110 3
110
560
751
VS65120 3
120
630
845
VS65140 3
140
710
952
VS65160 3
160
800
1073
VS65180 3
180
900
1207
VS65200 3
200
1000
1341
VS65250 3
250
1250
1676
VS65280 3
280
1400
1
877
VS65320 3
320
1600
2145
VS65360 3
360
1800
2413
VS65400 3
400
2000
2681
VS65450 3
450
2240
3003
VS65500 3
500
2500
3352
VS65560 3
560
2800
3754
VS65630 3
630
3150
4223
[2] kW standard motor rated power (cos φ= 0.88, 3.3kV)

VS65 SERIES MV SOFT STAR
TER
POWER ELECTRONICS
14
CONFIGURATION TABLE & STANDARD RATINGS
MODELS VS65 4.16kV
CODE NOMINAL
CURRENT (A) MOTOR POWER
(kW) (HP) [3]
VS65050 4
50
298
400
VS65055 4
55
336
450
VS65060 4
60
373
500
VS65070 4
70
447
600
VS65080 4
80
522
700
VS65095 4
95
597
800
VS65110 4
110
671
900
VS651
20 4
120
746
1000
VS65150 4
150
932
1250
VS65180 4
180
1119
1500
VS65210 4
210
1305
1750
VS65240 4
240
1491
2000
VS65270 4
270
1678
2250
VS65300 4
300
1864
2500
VS65320 4
320
2051
2750
VS65350 4
350
2237
3000
VS65410 4
410
2610
3500
VS65470 4
470
2983
4000
VS65530 4
530
3356
4500
VS65590 4
590
3728
5000
VS65650 4
650
4101
5500
VS65700 4
700
4474
6000
[3] HP standard motor rated power (cos φ= 0.88, 4.16kV)
MODELS VS65 6kV – 6.6kV
CODE NOMINAL
CURRENT (A) MOTOR POWER
(kW) [4] (HP)
VS65040 6
40
400
536
VS65045 6
45
450
603
VS65050 6
50
500
671
VS65055 6
55
560
751
VS65060 6
60
630
845
VS65070 6
70
710
952
VS65080 6
80
800
1073
VS6
5090 6
90
900
1207
VS65100 6
100
1000
1341
VS65125 6
125
1250
1676
VS65140 6
140
1400
1877
VS65160 6
160
1600
2146
VS65180 6
180
1800
2414
VS65200 6
200
2000
2682
VS65220 6
220
2240
3004
VS65250 6
250
2500
3353
VS65280 6
280
2800
3755
VS65300 6
3
00
3150
4224
VS65350 6
350
3550
4761
VS65400 6
400
4000
5364
VS65450 6
450
4500
6035
VS65500 6
500
5000
6705
VS65560 6
560
5600
7510
VS65630 6
630
6300
8449
[4] kW standard motor rated power (cos φ= 0.88, 6.6kV)
MODELS VS65 10kV – 11kV
CODE NOMINAL
CURRENT (A) MOTOR POWER
(kW) [5] (HP)
VS65020 6
20
400
536
VS65025 6
25
450
603
VS65030 6
30
500
671
VS65035 6
35
560
751
VS65040 6
40
630
845
VS65050 6
50
710
952
VS65055 6
55
800
1073
VS6
5060 6
60
900
1207
VS65075 6
75
1000
1341
VS65085 6
85
1250
1676
VS65095 6 95 1400 1877
VS65110 6
110
1600
2146
VS65120 6
120
1800
2414
VS65135 6
135
2000
2682
VS65150 6
150
2240
3004
VS65170 6
170
2500
3353
VS65190 6 190 2800 3755
VS65210 6
210
3150
4224
VS65240 6
240
3550
4761
VS65270 6
270
4000
5364
VS65300 6
300
4500
6035
VS65340 6
340
5000
6705
VS65380 6 380 5600 7510
[5] kW standard motor rated power (cos φ= 0.88, 11kV)

POWER ELECTRONICS
VS65 SERIES MV SOFT STARTER
TECHNICAL CHARACTERISTICS
15
3. TECHNICAL CHARACTERISTICS
INPUT
Input voltage
2300V
AC
, 3000VAC
-
3300V
AC
, 4160V
AC
, 6000VAC
-
6600V
AC,
10000VAC-11000VAC
[1]
Input fre
q
uen y
47
~ 62Hz
Control voltage
230
V
A
C ±10%, 50Hz
OUTPUT
Motor output voltage
2300V
AC
, 3000VAC
-
33
00V
AC
, 4160V
AC
, 6000VAC
-
6600V
AC,
10000VAC-11000VAC
Output Fr
eq
uen y
47
~
62Hz
Effi ien y
full load
)
> 99.6%
, 100% with Bypass
GENERAL DATA
Overload
125% of the ontinuous rated value
100% to 500% (during 1 ~ 60s onfigurable)
Phase sequen e
Comp
atible with any phase sequen e
Transitory over voltage prote tion
Snubber network
Cooling system
Natural
Bypass onta tor
Powerful enough to start the motor in dire t start mode.
Metal
-
Clad (optional)
Power Stage (SCR’s) and prote tions
Input Pro
te tion
(optional)
Fuses
ENVIRONMENTAL
PROTECTION
Prote tion degree
[1]
IP41
, IP54 (optional)
Work
temperatur
e
0
ºC to
+50ºC
Storage
temperature
-
25ºC
to
+55ºC
Hum
idity
5%
-
95%, Without
ondensa
t
i
o
n
Height
[1]
1000m,
Without
derating
INTERCONNECTION
Digital inputs
5
onfigurable input
s
Analog
ue
inputs
2 analogue inputs of 0
-
20mA or 4
-
20mA, 0
-
10V
Output relays
3 swit hed relays (non
-
indu tive 10A 250Va )
Analogue outputs
1 onfigurable output 0
-
20mA or 4
-
20mA
OPERATION
MODES
[2]
Starting modes
Current limit start
ing
Current
ramp and urrent limit start
ing
Dynami
torque ontrol
Dire t start
ing
Initial torque pulse start
ing
Stop modes
Inertia
stop
Stop with v
oltage ramp
KEYPAD AND
CONTROL PUSH
BUTTONS
Keypad
Ba klit, a
lphanumeri 2x16
hara ters
5
keys: start, stop,
a ess and s roll menu
Status leds:
ON: Green. Turned on indi ates there is voltage in the ontrol boards.
RUN: Orange. Flashing shows when the motor a elerates or de elerates. When
turned on indi ates the motor is working.
FAULT: Red. Indi ates fault.
Control door buttons
3
push buttons:
Start
, Stop and emergen y stop
1 start
ing
mode sele tor
5
status pilots
(running, stop
ped
, ready, power supply, alarm)
Input module (optional)
7 status pilots
(Power supply L1/L2/L3, MV swit hes status on/off/loaded
,
ontrol
voltage supply)
3 push buttons: swit h
status
, onne tion and dis onne tion
1 MV onne tion lo k sele tor
Display information
Current of the three phases
Line a
verage voltage
Di
gital inputs and relays status
Analogue inputs and outputs status
Power supply and motor frequen y
Power fa tor
Developed torque and power
Fault history (5 last faults)
Total and partial starts number
Total and part
ial operation hours
Partial motor onsumption
[1] For other voltages onsult with Power Ele troni s.
[2] For other onfigurations onsult with Power Ele troni s.

VS65 SERIES MV SOFT STAR
TER
POWER ELECTRONICS
16
TECHNICAL CHARACTERISTICS
GENERAL
FEATURES
Colour (Metal Parts)
RAL 7032
Corrosion Prote tion
C4
in a ordan e
with ISO 12944
-
2
Paint
ing
duration
H in a ordan e with ISO 12944
-
1
Input and output holes for abling
Yes,
a ess from above
COMMUNICATION
Standard Hardware
RS232 / RS485
Optional Hardware
Ethernet
Standard Proto ol
Modbus
-
RTU
Optional Prot
o ol
Profibus DP, Devi enet, Ethernet, N2 Metasys
Control modes
Lo al: from keyboard
Remote: from the digital and analogi inputs
PLC: start / stop
MOTOR
PROTECTIONS
Input phases sequen e
High Voltage
Input Low Voltage
Start urrent limi
t
Rotor lo ked
Motor overload (thermal model)
Under load
Unbalan ed phases
Shearpin urrent
Maximum number of starts/hour
SOFT STARTER
PROTECTIONS
SCR overheat
Ex essive start time (max 120s)
Input phase loss
SOFT STARTER
SETTINGS
Torque pulse
Initial torque
Initial torque time
A eleration time
Current limit: 1to 5·In
Overload: 0.8 to 1.2·In, Overload urve: 0 to 10
De eleration time / Freewheel stop
Slow Speed(1/7 fundamental frequen y)
Dual setting
Number of S
tarts/hour allowed
Torque ontrol
Water hammer ontrol stop
REGULATIONS
Certifi ation
CE
Designed as
EMC Dire tive (2004/108/CE)
EN61000
-
6
-
2,
-
4
Design and onstru tion
EN62271
-
1,
-
200
EN60071
-
1,
-
2

POWER ELECTRONICS
VS65 SERIES MV SOFT STARTER
TECHNICAL CHARACTERISTICS
17
3.1. Topology
The VS65 soft starter is divided in four sections that isolate the medium voltage from the low voltage
cabinets. The following image shows where the main soft starter components are placed.
Figure 3.1 Inner view- Main components
oPower stage with SCR modules.
Integrated in antiparallel and connected in series among themselves depending on the rated motor
voltage.
Voltage Pairs in series Total SCR
Inverse Peak
Voltage
2300V
1
6
6500V
3300V / 4160V
2
12
13000V
6000V / 6600V
3
18
19500V
oSnubber Circuit
The soft starter integrates dynamic voltage balanced circuits that protect and balance the current through
the SCR’s.
oTrigger circuit:
Provides trigger pulses to in order to control the SCR firing. Both the trigger circuit and the SCR are
connected to the medium voltage side and separated from the control board and the transformer by fiber
optics.
oLine vacuum Contactor:
The line contactor isolate the SCR once the motor is started, increasing the thyristor protection and
lifetime. It will activate when the run sequence command is received by the equipment. When the soft
starter receives the stop command, it will not open the line contactor until the soft starter has stopped the
motor. The status of the contactor can be seen through its dedicated window.
Note: When the customer selects the input module option equipped with circuit breaker, the line
contactor will not be included in the soft starter because its function will be assumed by the circuit
breaker.

VS65 SERIES MV SOFT STAR
TER
POWER ELECTRONICS
18
TECHNICAL CHARACTERISTICS
oBypass vacuum contactor:
After the SS starts the motor, the bypass contactor will close allowing the current flow to the motor
through the bypass contactor placing the SCR in bypass. When the soft starter receives a stop
command, the bypass contactor will open allowing the soft starter to make a soft motor stop.
oFuses (Optional)
The SS could optionally include input overcurrent protection with fuses. Check the maximum interrupting
to ensure the compatibility with the connection point.
oGround Fault Monitoring Relay (Optional)
Although the SS integrate as standard a current unbalance protection, it can be equipped with an
optional ground fault monitoring relay that fulfills safety installation requirements.
oUser interface
The VS65 SS integrates as standard multiple door push buttons and pilots (Start, Stop, ready ...) and an
alphanumeric display suitable for industrial environments. Additionally, it is available with multiple
communication interfaces and analog and digital I/O.
3.2. Operating Principles
The VS65 has a microcontroller as control nucleus which can start and protect the motor. The CPU is
able to control and trigger the SCR phase degree. The effective voltage applied to the motor is controlled
by controlling the thyristor trigger instant. This way, the torque is smoothly increased until the motor
spinning rated speed is reached after the acceleration ramp.
Figure 3.2 Block diagram example