Toshiba JKSSS Series User manual

Document: VF01H05 Rev. 12
INSTRUCTION MANUAL
INSTALLATION – OPERATION - MAINTENANCE
JKSSS Series
Medium Voltage
Solid State Starter
Issued: 3/20
Firmware Version 7.34

Basic Installation and Operation
Guide
JKSSS Series Solid State Soft Starters

Basic Installation and Operation
Guide
JKSSS Series Solid State Soft Starters
Important Notice
The instructions contained in this manual are not intended to cover all details or variations in equipment
types nor may it provide for every possible contingency concerning the installation, operations, or
maintenance of this equipment. Should additional information be required, contact your Toshiba
Customer Support Center.
The contents of this manual shall not become a part of or modify any prior or existing agreement,
commitment, or relationship. The sales contract contains the entire obligation of Toshiba International
Corporation. The warranty contained in the contract between the parties is the sole warranty of Toshiba
International Corporation and any statements contained herein do not create new warranties or modify
the existing warranty.
Any electrical or mechanical modifications to this equipment without the prior written consent of
Toshiba International Corporation may void all warranties or other safety certifications.
Unauthorized modifications may also result in safety hazard or equipment damage.
Misuse of this equipment could result in injury and equipment damage. In no event will Toshiba
International Corporation be responsible or liable for direct, indirect, special, or consequential
damage or injury that may result from the misuse of this equipment.
About This Manual
Every effort has been made to provide accurate and concise information to you, our customer.
At Toshiba International Corporation we are continuously striving for better ways to meet the constantly
changing needs of our customers. E-mail your comments, questions, or concerns about this publication
to [e-mail].

Basic Installation and Operation
Guide
JKSSS Series Solid State Soft Starters
Purpose and Scope of Manual
This manual provides information on how to safely install, operate, maintain, and dispose of your JKSSS
solid state starter. The information provided in this manual is applicable to the JKSSS starter only.
This manual provides information on the various features and functions of this powerful device,
including:
• Installation
• Operation
• Mechanical and electrical specifications
Included is a section on general safety instructions that describe the warning labels and symbols that
are used on the device and throughout the manual. Read the manual completely before installing,
operating, performing maintenance, or disposing of this equipment.
This manual and the accompanying drawings should be considered a permanent part of the equipment
and should be readily available for reference and review. Dimensions shown in the manual are in
imperial units and/or the metric equivalent. Connection drawings within this document convey the typical
topology of the JKSSS starter.
Because of our commitment to continuous improvement, Toshiba International Corporation reserves the
right, without prior notice, to update information, make product changes, or to discontinue any product or
service identified in this publication.
Toshiba International Corporation (TIC) shall not be liable for direct, indirect, special, or
consequential damages resulting from the use of the information contained within this manual.
This manual is copyrighted. No part of this manual may be photocopied or reproduced in any form
without the prior written consent of Toshiba International Corporation.
© Copyright 2020 Toshiba International Corporation.
TOSHIBA® is a registered trademark of Toshiba Corporation. All other product or trade references
appearing in this manual are registered trademarks of their respective owners.
All rights reserved.
Printed in the U.S.A.

Basic Installation and Operation
Guide
JKSSS Series Solid State Soft Starters
Contacting TIC’s Customer Support Center
Toshiba International Corporation’s Customer Support Center can be contacted to obtain help in
resolving any system problem that you may experience or to provide application information.
The center is open from 8 a.m. to 5 p.m. (CST), Monday through Friday. The Support Center’s toll
free number is US [phone]/Fax [phone] — Canada [phone].
You may also contact Toshiba International Corporation by writing to:
Toshiba International Corporation
13131 West Little York Road
Houston, Texas 77041-9990
For further information on Toshiba International Corporation’s products and services, please visit our
website at www.toshiba.com/tic/.
TOSHIBA INTERNATIONAL CORPORATION
JK Series Solid State Starter
Complete the following information and retain for your records.
Model Number: _____________________________________________________________________
Serial Number: _____________________________________________________________________
Project Number (if applicable):_________________________________________________________
Date of Installation: _________________________________________________________________
Inspected By: _____________________________________________________________________
Name of Application: ________________________________________________________________

Basic Installation and Operation
Guide
JKSSS Series Solid State Soft Starters
TOSHIBA
General Safety Information
DO NOT attempt to install, operate, maintain, or dispose of this equipment until you have read and understood
all of the product safety information and directions that are contained in this manual.
Safety Alert Symbol
The Safety Alert Symbol is comprised of an equilateral triangle enclosing an exclamation mark. This indicates
that a potential personal injury hazard exists.
Signal Words
Listed below are the signal words that are used throughout this manual followed by their descriptions and
associated symbols. When the words DANGER, WARNING, and CAUTION are used in this manual, they will be
followed by important safety information that must be carefully followed.
The word DANGER preceded by the safety alert symbol indicates that an imminently hazardous situation exists
that, if not avoided or if instructions are not followed precisely, will result in serious injury to personnel or loss of
life.
The word WARNING preceded by the safety alert symbol indicates that a potentially hazardous situation exists
that, if not avoided or if instructions are not followed precisely, could result in serious injury to personnel or loss
of life.
The word CAUTION proceeded by the safety alert symbol indicates that a potentially hazardous situation exists
that, if not avoided or if instructions are not followed precisely, may result in minor or moderate injury.
The word NOTE provides helpful information.
NOTE
DANGER
WARNING
CAUTION

Basic Installation and Operation
Guide
JKSSS Series Solid State Soft Starters
TOSHIBA
Equipment Labels (Safety, Rating, Information)
DO NOT attempt to install, operate, perform maintenance, or dispose of this equipment until you
have read and understood all of the product labels and user directions that are contained in this manual.
Shown below are examples of safety labels that may be found attached to the equipment. DO NOT
remove or cover any of the labels. If the labels are damaged or if additional labels are required, contact your
Toshiba representative for additional labels.
Labels attached to the equipment are there to provide useful information or to indicate an
imminently hazardous situation that may result in serious injury, severe property and equipment damage, or
death if the instructions are not followed.
SAFETY labels that will be found on the equipment are shown below:

Basic Installation and Operation
Guide
JKSSS Series Solid State Soft Starters
TOSHIBA
Qualified Personnel
Installation, operation, and maintenance shall be performed by Qualified Personnel ONLY. A Qualified Person
is one that has the skills and knowledge relating to the construction, installation, operation, and maintenance of
the electrical equipment and has received safety training on the hazards involved (Refer to the latest edition of
NFPA 70E for additional safety requirements). Outside the U.S., follow all applicable national and local safety
practices.
Qualified Personnel shall:
• Have carefully read the entire manual.
• Be familiar with the construction and function of the starter, the equipment being driven, and the hazards
involved.
• Be able to recognize and properly address hazards associated with the application of motor-driven equipment.
• Be trained and authorized to safely energize, de-energize, ground, lock-out/tag-out circuits and equipment, and
clear faults in accordance with established safety practices.
• Be trained in the proper care and use of protective equipment such as safety shoes, rubber gloves, hard hats,
safety glasses, face shields, flash clothing, etc., in accordance with established safety practices.
• Be trained in rendering first aid.
For further information on workplace safety in the U.S. visit www.osha.gov. Oustide the U.S., refer to
your local existing plant safety regulations.
Equipment Inspection
• Upon receipt of the equipment, inspect the packaging and equipment for shipping damage.
• Carefully unpack the equipment and check for parts that may have been damaged during shipping, missing
parts, or concealed damage. If any discrepancies are discovered, it should be noted with the carrier prior to
accepting the shipment, if possible. File a claim with the carrier if necessary and immediately notify your Toshiba
Customer Support Center.
• DO NOT install or energize equipment that has been damaged. Damage equipment may fail during operation
resulting in further equipment damage or personal injury.
• Check to see that the rated capacity and the model number specified on the nameplate conform to the order
specifications.
• Modification of this equipment is dangerous and is to be performed by factory trained personnel ONLY. When
modifications are required contact your Toshiba representative.
• Inspections may be required after moving the equipment.
• Contact your Toshiba representative for assistance if required.

Basic Installation and Operation
Guide
JKSSS Series Solid State Soft Starters
TOSHIBA
Handling and Storage
• Use proper lifting techniques when moving the equipment, including properly sizing up the load, getting
assistance, and using a forklift if required.
• Store in a well-ventilated location, preferably in the original packaging, if the equipment will not be used upon
receipt.
• Store in a cool, clean, and dry location. Avoid storage locations with extreme temperatures, rapid temperature
changes, high humidity, moisture, dust, corrosive gases, or metal particles.
• The storage temperature range of the breaker is 23° to 104° F (-5° to 40° C).
• DO NOT store the unit in places that are exposed to outside weather conditions (e.g., wind, rain, snow).
• Store in an upright position as indicated on the shipping carton.
• Include any other product-specific requirement.
Disposal
Never dispose of electrical components via incineration. Contact your state environmental agency for details
on disposal of electrical components and packaging in your area.
Installation Precautions
Location and Ambient Requirements
• Adequate personnel working space and illumination must be provided for adjustment, inspection, and
maintenance of the equipment. In the U.S., refer to NEC Article 110-34 for requirements. Outside the U.S.,
follow applicable local electrical code requirements.
• Avoid installation in areas where vibration, heat, humidity, dust, fibers, steel particles, explosive/corrosive mists
or gasses, or sources of electrical noise are present.
• Do not install the starter where it may be exposed to flammable chemicals or gasses, water, solvents, or other
fluids.
• The ambient operating temperature shall be between 0° to 40° C (32° and 105° F).
• Allow proper clearance spaces for installation. Do not obstruct the ventilation openings. Refer to the
recommended minimum installation dimensions as shown on the enclosure outline drawings.
Mounting Requirements
• Only Qualified Personnel should install this equipment.
• Install the unit in a secure upright position in a well-ventilated area.
• A noncombustible insulating floor or mat should be provided in the area immediately surrounding the electrical
system at the place where maintenance operations are to be performed.

Basic Installation and Operation
Guide
JKSSS Series Solid State Soft Starters
TOSHIBA
• Equipment should be installed according to all applicable national, regional, and industry codes and standards.
In the U.S., installation of the equipment should conform to NEC Article 110 Requirements For Electrical
Installations and to OSHA requirements.
• In the U.S., installation practices should conform to the latest revision of NFPA 70E Electrical Safety
Requirements for Employee Workplaces. Outside the U.S., applicable national and local installation safety
practices should be followed. In the EU refer to section 6.5 of HD 637 and its sub clauses.
Personnel Protection
• Installation, operation, and maintenance shall be performed by Qualified Personnel Only.
• A thorough understanding of the starter will be required before installation, operation, or maintenance.
• Rotating machinery and live conductors can be hazardous and shall not come into contact with humans.
Personnel should be protected from all rotating machinery and electrical hazards at all times.
• Insulators, machine guards, and electrical safeguards may fail or be defeated by the purposeful or inadvertent
actions of workers. Insulators, machine guards and electrical safeguards are to be inspected (and tested where
possible) at installation and periodically after installation for potential hazardous conditions.
• Do not allow personnel near rotating machinery. Warning signs to this effect shall be posted at or near the
machinery.
• Do not allow personnel near electrical conductors. Human contact with electrical conductors can be fatal.
Warning signs to this effect shall be posted at or near the hazard.
• Personal protection equipment shall be provided and used to protect employees from any hazards inherent to
the system operation.

Basic Installation and Operation
Guide
JKSSS Series Solid State Soft Starters
TOSHIBA
Table of Contents
PAGE
Chapter 1: Introduction ................................................................................................................................... 1
1.1 Overview ......................................................................................................................................................... 1
1.2 Specifications.............................................................................................................................................. 1-2
1.3 Reference Chart ............................................................................................................................................. 3
1.4 Design Features .......................................................................................................................................... 4-5
1.5 Theory of Operation.................................................................................................................................... 5-6
1.6 General Protection ...................................................................................................................................... 6-7
1.7 Thermal Overload Protection........................................................................................................................ 7
1.8 Firing Circuit................................................................................................................................................... 8
1.9 Electronics ................................................................................................................................................... 8-9
Fig. 1.9 Keypad Interface ................................................................................................................................. 8
Chapter 2: Connections................................................................................................................................. 10
2.1 Warnings ....................................................................................................................................................... 10
2.2 Receiving, Handling/Moving and Unpacking ............................................................................................ 10
2.3 Initial Inspection........................................................................................................................................... 11
2.4 Location ........................................................................................................................................................ 12
2.5 Mounting ....................................................................................................................................................... 13
2.6 Additional Cabinet Entries .......................................................................................................................... 13
2.7 Pre-energization Check ............................................................................................................................... 14
2.8 Medium Voltage Power Connections......................................................................................................... 16
2.9 Control Connections.................................................................................................................................... 19
2.9.1 TCB Board............................................................................................................................................. 19
Fig. 2.9.1 TCB Terminal and Control Board ................................................................................................... 19
2.9.2 Description of Terminal Connections ............................................................................................... 20-22
2.9.3 Description of Jumper Selections and Functions .................................................................................. 22
2.9.4 Description of Switch Settings and Functions ....................................................................................... 23
2.9.5 Description of LED Indicator Functions................................................................................................. 23
2.10 Circuit Board Layout Reference Section ............................................................................................ 24-27
Fig. 2.10.1 RTD Board ................................................................................................................................... 24
Fig. 2.10.2 RS485 / RS422 Communications Board...................................................................................... 24
Fig. 2.10.3 Main Board ................................................................................................................................... 25
Fig. 2.10.4 CPU Board ................................................................................................................................... 26
2.11 Typical Wiring Diagram ............................................................................................................................. 27
Fig. 2.11 Typical Wiring Diagram ................................................................................................................... 27
Chapter 3: Start-Up......................................................................................................................................... 28
3.1 Introduction .................................................................................................................................................. 28
3.2 Acceleration Adjustments........................................................................................................................... 28
Fig. 3.2.3 Current Limit................................................................................................................................... 28
3.3 Deceleration Adjustments...................................................................................................................... 29-30
Fig. 3.3 Deceleration Control.......................................................................................................................... 29
3.4 Sequence of Normal Operation .................................................................................................................. 30
3.5 Emergency Bypass Operation .................................................................................................................... 31
Chapter 4: User Interface and Menu Navigation..................................................................................... 32
4.1 Keypad/Operator Interface.......................................................................................................................... 32
4.2 Menu Navigation .......................................................................................................................................... 33
4.2.1 Password Access .................................................................................................................................. 34
4.2.2 Changing Setpoints ............................................................................................................................... 34

Basic Installation and Operation
Guide
JKSSS Series Solid State Soft Starters
TOSHIBA
Chapter 5: Setpoint Programming.............................................................................................................. 35
5 .1 Setpoints Page List................................................................................................................................ 35-41
5.1.1 Basic Configuration (Setpoint Page 1) ................................................................................................. 35
5.1.2 Starter Configuration (Setpoint Page 2) ............................................................................................... 35
5.1.3 Phase and Ground Settings (Setpoint Page 3) .................................................................................... 36
5.1.4 Relay Assignments (Setpoint Page 4) ................................................................................................. 37
5.1.5 Relay Configuration (Setpoint Page 5) ................................................................................................. 38
5.1.6 User I/O Configuration (Setpoint Page 6) ............................................................................................ 38
5.1.7 Custom Acceleration Curve (Setpoint Page 7) ..................................................................................... 39
5.1.8 Overload Curve Configuration (Setpoint Page 8) ................................................................................. 39
5.1.9 RTD Configuration (Setpoint Page 9) ................................................................................................... 40
5.1.10 RTD Password Level Configuration (Setpoint Page 10) .................................................................... 41
5.1.11 Communication (Setpoint Page 11) ................................................................................................... 41
5.1.12 System (Setpoint Page 12) ................................................................................................................. 41
5.1.13 Calibration and Service (Setpoint Page 13) ....................................................................................... 41
5.2 Setpoints Menu and Parameter Explanation......................................................................................... 42-57
SP.1 Basic Configuration........................................................................................................................... 42-43
SP.2 Starter Configuration......................................................................................................................... 44-47
Fig. SP2.3 Example of Switching from Jog to Start Ramp #1 Type: Voltage................................................. 45
Fig. SP2.4 Power Ramp ................................................................................................................................. 46
SP.3 Phase & Ground Settings ................................................................................................................. 48-50
SP.4 Relay Assignment............................................................................................................................. 51-53
SP.5 Relay Configuration ............................................................................................................................... 53
SP.6 User I/O Configuration ...................................................................................................................... 54-56
SP.7 Custom Acceleration Curve .............................................................................................................. 57-59
SP.8 Overload Curve Configuration .......................................................................................................... 60-61
SP.9 RTD Configuration ............................................................................................................................ 62-63
SP.10 Set Password....................................................................................................................................... 63
SP.11 Communications .................................................................................................................................. 64
SP.12 System Setpoints ............................................................................................................................ 65-66
SP.13 Calibration & Service ........................................................................................................................... 67
Chapter 6: Metering Pages............................................................................................................................. 68
6.1 Metering Page List ................................................................................................................................... 68-69
6.1.1 Metering Menu & Data (Metering Page 1) ............................................................................................ 68
6.1.2 Metering (Metering Page 2) .................................................................................................................. 68
6.1.3 RTD Values (Metering Page 3) ............................................................................................................ 68
6.1.4 Status (Metering Page 4) ...................................................................................................................... 69
6.1.5 Event Recorder (Metering Page 5) ....................................................................................................... 69
6.1.6 Last Trip (Metering Page 6) .................................................................................................................. 69
6.1.7 Statistics (Metering Page 7) ................................................................................................................ 69
6.2 Metering Menu and Explanation............................................................................................................. 70-77
MP.1 Metering Data........................................................................................................................................ 71
MP.2 Metering ................................................................................................................................................ 72
MP.3 RTD Values ........................................................................................................................................... 73
MP.4 Status .................................................................................................................................................... 74
MP.5 Event Recorder – 60 Events ................................................................................................................. 75
MP.6 Last Trip ................................................................................................................................................ 76
MP.7 Statistics ................................................................................................................................................ 77

Basic Installation and Operation
Guide
JKSSS Series Solid State Soft Starters
TOSHIBA
Chapter 7: Maintenance and Troubleshooting............................................................................................ 78
7.1 Failure Analysis.......................................................................................................................................... 78-80
7.1.1 SCR Testing Procedure .......................................................................................................................... 80
APPENDIX A: Modbus RTU Communication and Registers .......................................................81

Basic Installation and Operation
Guide
JKSSS Series Solid State Soft Starters
TOSHIBA
1
Chapter 1 - Introduction
This chapter is an introduction to the Toshiba JKSSS+ Reduced Voltage Solid State Soft Starter for medium voltage
AC motors. It is highly recommended that users read this section thoroughly to become familiar with the basic
configuration, operation and features before applying the soft starter.
1.1 Overview
The standard JKSSS+ Series solid state starter is a complete NEMA Class E-2 motor controller designed for the
starting, protection and control of AC medium voltage motors. It contains the motor disconnect switch, motor circuit
fuses, control power transformer, a line isolation contactor, SCR stack assembly, bypass contactor, and low voltage
controls.
1.2 Specifications
GENERAL
Unit Running Overload Capacity
(Percent of motor FLA)
125% - Continuous
500% - 60 seconds
1 Cycle: Up to 14x FLA (Internally protected by the programmable short circuit)
Frequency
50 or 60Hz, +2Hz hardware selectable
Power Circuit
6 SCRs, 12 SCRs, 18 SCRs (Model dependent)
SCR Peak Inverse Voltage Ratings
6500V - 19500V (Model dependent see Table 1)
Phase Insensitivity
User selectable phase sequence detection
Transient Voltage Protection
RC snubber dv/dt networks (One per inverse pair of SCRs)
Ambient Condition Design
Enclosed units: 0° to 40°C (32° to 104°F) (optional - 20° to 50° C with heaters)
5 - 95% relative humidity
0 - 3300 ft. (1000m) above sea level without de-rating
(Ratings for ambient conditions external to unit)
Control
2 or 3 wire 120VAC (Customer supplied)
Auxiliary Contacts
Multiple: Form C (Contacts), rated 5 Amps, 240VAC max.
8 Relays (4 programmable): Form C contacts
Fault Indicator: Form C contacts
BIL Rating
2300V - 7200V 60KV
Approvals
400A model: UL listed, Canadian UL (cUL) listed
ADVANCED MOTOR PROTECTION
Two Stage Electronic
Overload Curves
Starting: Programmable for Class 5 through 30
Run: Programmable for Class 5 through 30 when "At-Speed" is detected.
Overload Reset
Manual
Retentive Thermal Memory
Overload circuit retains thermal condition of the motor regardless of control
power status. Unit uses real time clock to adjust for off time.
Dynamic Reset Capacity
Overload will not reset until thermal capacity available in the motor is sufficient for
a successful restart. Starter learns and retains this information by monitoring
previous successful starts.
Phase Current Imbalance
Protection
Imbalance Trip Level: 5 - 30% current between any two phases
Imbalance Trip Delay: 1 -20 seconds
Over Current Protection
(Electronic Shear Pin)
Trip Level: 100 - 300% of motor FLA
Trip Delay: 1 - 20 seconds
Load Loss Trip Protection
Under Current Trip Level: 10 -90 % of motor FLA
Under Current Trip Delay: 1 - 60 seconds
Coast Down (Back Spin)
Lockout Timer
Coast Down Time Range: 1 - 60 minutes
Starts-per-hour Lockout Timer
Range: 1 - 6 successful starts per hour
Time between starts: 1 - 60 minutes between start attempts

Basic Installation and Operation
Guide
JKSSS Series Solid State Soft Starters
TOSHIBA
2
PROGAMMABLE OUTPUTS
Type / Rating
Form C (SPDT), Rated 5A, 240Vac max, (1200 VA)
Run Indication
Programmable
At Speed Indication
Programmable
Acceleration Adjustments
Programmable Ramp Types: Voltage or Current Ramp (VR or CR)
Starting Torque: 0 - 100% of line voltage (VR) or 0 - 600% of motor FLA (CR)
Ramp Time: 1 to 120 seconds
Current Limit: 200 - 500% (VR or CR)
Dual Ramp Settings
4 Options: VR1+VR2; VR1+CR2; CR1+CR2; CR1+VR2
Dual Ramp Control: Ramp 1 = Default
Ramp 2 = selectable via dry contact input
Deceleration Adjustments
Begin Decel Level: 0 - 100% of line voltage
Stop Level: 0 to 1% less than Begin Decel Level
Decel Time: 1 - 60 seconds
Jog Settings
Voltage Jog: 5 - 75%
Kick Start Settings
Kick Voltage: 10 - 100%
Kick Time: 0.1 - 2 seconds
Fault Display
Shorted SCR, Phase Loss, Shunt Trip, Phase Imbalance Trip, Overload,
Overtemp, Overcurrent, Short Circuit, Load Loss, Undervoltage or Any Trip
Lockout Display
Coast Down Time, Starts Per Hour, Time Between Starts, and Any Lockout
EVENT HISTORY
Up to 60 Events
Data includes cause of event, time, date, voltage, power factor and current for
each phase and ground fault current at time of event
METERING FUNCTIONS
Motor Load
Percent of FLA
Current Data
A, B, C Phase Current, Avg. Current, Ground Fault (Option)
Thermal Data
Remaining thermal register; thermal capacity to start
Start Data
Avg. Start Time, Avg. Start Current, Measured Capacity to start, time since last
start.
RTD Data
Temperature readings from up to 12 RTDs (6 stator RTDs)
Voltage Metering
kW, kVAR, PF, kWH
SERIAL COMMUNICATIONS
Protocol
Modbus RTU
Signal
RS-485, RS-422 or RS232
Network
Up to 247 devices per mode
Functionality
Full operation, status view, and programming via communications port
OPERATOR INTERFACE
OLED Readout
Alpha numeric OLED display
Keypad
8 function keys with tactile feedback
Status Indicators
12 LEDs include Power, Run, Alarm, Trip, Aux Relays
Remote Mount Capability
Up to 1000 circuit-feet from chassis (Use twisted, shielded wire & power source)
CLOCK and MEMORY
Operating Memory
SRAM loaded from EEPROM at initialization
Factory Default Storage
Flash EPROM, field replaceable
Customer Settings and Status
Non-volatile EEPROM, no battery backup necessary
Real Time Clock
Lithium ion battery for clock memory only

Basic Installation and Operation
Guide
JKSSS Series Solid State Soft Starters
TOSHIBA
3
1.3 Reference chart
SEC. Table or Drawing
Page
Number
SEC. Table or Drawing
Page
Number
1.2 Specifications 1 - 2
5.2
Setpoint Page 7 Displays -
Custom Acceleration Curve
57- 59
1.4 Unit PIV Ratings 4
Setpoint Page 8 Displays -
Overload Curve Configuration
60-61
1.9
&
4.1
Keypad Operator Interface 8 & 32 Setpoint Page 9 Displays -
RTD Configuration 62-63
2.9
TCB Board Layout and
Connections
19
Setpoint Page 10 Displays -
Set Password
63
TB1, TB2 & TB3 Description 20
Setpoint Page 11 Displays -
Communications
64
TB4, TB5, TB6 & TB7
Description
21
Setpoint Page 12 Displays -
System Setpoints
65-66
TB8 Description 22
Setpoint Page 13 Displays -
Calibration & Service
67
Jumper Selections
22
6.1
Metering Page List
68-69
Switch Settings
23
6.2
Metering Menu
70
LED Indicators
23
Metering Page 1 Displays - Metering Data
71
2.3
RTD Board
24
Metering Page 2 Displays - Metering
72
Communications Board Layout
& Connections: RS485 and
RS422
24 Metering Page 3 Displays - RTD Values 73
Power Board & Connections
25
Metering Page 4 Displays - Status
74
CPU Board Layout &
Connections
26 Metering Page 5 Displays - Event Recorder 75
2.4
Typical Wiring Diagram
27
3.2
Acceleration Adjustments
28
Metering Page 6 Displays - Last Trip
76
3.3
Deceleration Adjustments
29
Metering Page 7 Displays - Statistics
77
3.4
Sequence of Operations
30
7.1
Failure Analysis & Troubleshooting
78 - 80
4.2
Menu Navigation
32
7.1
SCR Testing Procedure
80
Changing Setpoints Example
34
NOTES-
5.1
Setpoints Page List
35 - 41
5.2
Setpoint Menu & Parameter
Explanation
42
Setpoint Page 1 Displays -
Basic Configuration
42
Overload Class Trip Curves
43
Setpoint Page 2 Displays -
Starter Configuration
44
Jog/Voltage Ramp
45
Setpoint Page 3 Displays -
Phase & Ground Settings
48 – 50
Overcurrent Trip Delay Graph
48
Setpoint Page 4 Displays -
Relay Assignment
51-53
Setpoint Page 5 Displays -
Relay Configuration
53
Setpoint Page 6 Displays -
User I/O Configuration
54 - 56

Basic Installation and Operation
Guide
JKSSS Series Solid State Soft Starters
TOSHIBA
4
1.4 Design Features
The standard JKSSS+ configuration is a complete NEMA Class E-2 motor controller which includes the following features:
•Isolation Switch: An isolation switch is provided in the incoming power section of the starter assembly. The
maximum voltage is 7200V.
Power is switched on and off to the controller by a fixed-mounted, externally-operated, three-pole isolation switch.
When the switch is in the opened position, incoming power is isolated from the controller compartment interior by an
automatic shutter. For additional safety, the load terminals of the switch are automatically grounded when the switch
is opened. This allows any stored energy in the controller load circuit to be discharged by closing the contactor using
test power.
A viewing window in the Main Incoming Power Compartment allows visual inspection of the disconnect blade status
with the medium voltage door closed.
The external operating handle for the isolation switch is designed to accept up to three external padlocks in the OFF
position.
For additional information on the isolation switch, see instruction manual VF010H01, VF010H02 or VF010H03.
•Power Fuses: As a NEMA Class E2 controller, current limiting primary power fuses are provided for each incoming
phase.
Typically the fuses are ANSI class “R” for units rated up to 5000V. The fuses are sized according to motor locked rotor
current and are coordinated with the solid state overload relay. The fuse and overload coordination is designed to
allow the controller and contactor to clear low and medium level faults. This prevents exceeding the contactor interrupt
ratings. Fuses interrupt high level faults that exceed the contactor interrupt ratings.
• SCR Power Modules: For each phase, the SCRs are arranged in inverse parallel pairs and series strings as indicated
in Table1 below to facilitate sufficient Peak Inverse Voltage ratings for the application.
• RC Snubber Networks: Provide Transient Voltage Protection for SCR Power Modules in each phase to avoid
dv/dt damage.
• Firing Circuit: The SCRs are gated (turned on) using a Sustained Pulse Firing Circuit. This circuitry is isolated from
the control voltage by means of fiber optics.
Table 1 Unit PIV Ratings
200 & 400 Amps Units
500, 600 & 800 Amps Units
Voltage Series
Pairs
Total
Number
of SCRs
PIV Rating
Voltage Series
Pairs
Total
Number
of SCRs
PIV Rating
2300 V
0
6
6500 V
2300 V
2
12
6500 V
3300 / 4160 V
2
12
13000 V
3300 / 4160 V
4
24
13000 V
6000 – 6600V
3
18
19500 V
6000 – 6600V
4
36
18000 V

Basic Installation and Operation
Guide
JKSSS Series Solid State Soft Starters
TOSHIBA
5
Removable conduit entry plates are provided in the bottom of the enclosures to facilitate drilling and punching of conduit holes
without exposing the equipment to contamination from metal debris.
•Enclosure Finish:The enclosure is suitable for use in noncorrosive environments. The paint is ANSI 61 gray polyurethane
powder over a zinc phosphate pretreatment with a minimum thickness of 2 mil. 11 gauge steel is used in all enclosures. All
NEMA 1 & 12 units have bottom entrance plates.
•Lifting Provisions: Eyes or angles capable of supporting the maximum weight of each shipping split are provided on the
top of the enclosure.
•Power Bus: Optional main horizontal phase bus bars can be configured to extend the entire length of the starter lineup. Bus
bar material is tin-plated or silver-plated copper. All bus ratings are per UL Standard 347.
•Bracing: Bus bars are braced with non-tracking fire resistant non-hygroscopic insulation supports and have a minimum fault
current rating of 50,000 Amps.
•Connections: All bus connections use 2 bolts minimum, with Belleville spring washers to ensure tightness. Splice kits for
each shipping split are included, along with specific installation instructions.
•Ground Bus: A continuous ground bus bar with a minimum rating of 400 Amps extends the entire length of the starter near
the bottom of each enclosure. A grounding strap connects each vertically adjacent compartment and also ties the grounding
arm of the disconnect switch to the main ground bus bar (see section 2.8).
•Seismic Qualifications: The entire starter assembly, when properly installed, withstands vertical and horizontal
accelerations typical of seismic Zones 1 through 4 as defined in the UBC. The assembly will not overturn or show significant
lateral movement, but cannot be expected to continue operating during, or after, a seismic event.
1.5 Theory of Operation
The soft starter is CPU controlled, using a microprocessor based protection and control system for the motor and
starter assembly. The CPU uses Phase Angle Firing control of the SCRs to apply a reduced voltage to the motor,
and then slowly and gently increases torque using voltage and current control until the motor accelerates to full
speed. This starting method lowers the starting current of the motor, reducing electrical stresses on the power
system and motor. It also reduces peak starting torque stresses on both the motor and load mechanical
components, promoting longer service life and less downtime.
1.5.1 Acceleration:
The soft starter comes standard with several methods of accelerating the motor so that it can be programmed to
match almost any industrial AC motor application. The factory default setting applies a Voltage Ramp with
Current Limit as this has been proven to be the most reliable starting method for the vast majority of
applications. Using this starting method, the Initial Torque setting applies just enough voltage to the motor to
cause the motor shaft to begin to turn. This voltage is then gradually increased over time (Ramp Time setting)
until one of three things happen: the motor accelerates to full speed, the Ramp Time expires, or a Current Limit
setting is reached. If the motor accelerates to full speed before the ramp time setting has expired, an automatic
Anti-oscillation feature will override the remaining ramp time and full voltage will be applied. This will prevent any
surging or pulsation in the motor torque, which might otherwise occur due to the load not being fully coupled to
the motor when operating at reduced voltage and torque levels. If the motor has not reached full speed at the end
of the ramp time setting, the current limit setting will proportionally control the maximum output torque. Feedback
sensors provide protection against a stall condition, an overload condition, or excessive acceleration time.
The Current Limit feature is provided to accommodate installations where there is limited power available (for
example, on-site generator power or utility lines with limited capacity). The torque is increased until the motor
current reaches the pre-set Current Limit point and it is then held at that level. Current Limit overrides the ramp
time setting so if the motor has not accelerated to full speed under the Current Limit setting, the current remains
limited for as long as it takes the motor to accelerate to full speed. When the motor reaches full speed and the

Basic Installation and Operation
Guide
JKSSS Series Solid State Soft Starters
TOSHIBA
6
current drops to running levels, the soft starter detects an At-Speed condition and closes the Bypass Contactor.
The Bypass Contactor serves to shunt power around the SCR stack assemblies to prevent heat build-up in the
starter enclosure due to the slight voltage drop across the SCRs. At this point, the motor is operating at full
voltage, speed and power.
Other starting methods available in the soft starter are:
•Current Ramp uses a closed current feedback PID loop to provide a linear torque increase up to a Maximum
Current level.
•Constant Current is immediately increased to the Current Limit point and held there until the motor reaches
full speed.
•Power (kW) Ramp uses True RMS kW feedback PID loop to provide a linear increase in True RMS motor
power to a maximum set kW value.
•Custom Curve gives the user the ability to plot torque and time points on a graph. The soft starter will then
accelerate the motor following these points.
• Tachometer Feedback Ramp uses a closed loop speed follower method monitoring a tachometer input
signal from the motor or load shaft to provide a linear RPM acceleration.
1.5.2 Deceleration: the soft starter provides the user with the option of having the load coast to a stop or controlling the
deceleration by slowly reducing the voltage to the motor upon initiating a stop command. The Decel feature is the
opposite of DC injection braking in that the motor will actually take longer to come to a stop than if allowed to
coast to a stop. The most common application for the Decel feature is pumping applications where a controlled
stop prevents water hammer and mechanical damage to the system.
1.6 General Protection
The soft starter is provided with a built-in motor protection relay that can be programmed for primary protection of
the motor / load system. Operation of the soft starter can be divided into 4 modes: Ready, Start, Run and Stop.
1.6.1. Ready Mode: In this mode, control and line power are applied and the starter is ready for a start command.
Protection during this mode includes the monitoring of current for leakage through multiple shorted SCRs or
welded contacts on the Bypass Contactor. Other protection features in effect are:
•Starter Power Pole Temperature
• Shorted SCR
• Blown Fuse Indication
•Phase Reversal (if enabled)
•Line Frequency Trip Window
•External Input Faults
•Undervoltage
•Overvoltage
Note: The “Programming Mode” can only be entered from the Ready Mode. Any attempt to enter data while the
motor is starting or running will be blocked. During programming, all protection features and start command
are disabled.
1.6.2 Start Mode: These additional protection functions are enabled when the soft starter receives a valid Start
command:
•Phase Reversal (if enabled) – Phase Reversal will still be on and is not a newly active feature when starting.
•Start Curve
•Acceleration Timer
•Phase Imbalance
•Short Circuit / Load Pre-check (Toe-in-the-Water)
•Ground Fault (Optional)
•External Input Faults
•Accumulated Starting FLA Units (I2t Protection)
•Starting Overload Protection Curve Selection
•Thermal Capacity
Note: Shorted SCR protection is no longer in effect once the soft starter goes into the Start Mode.

Basic Installation and Operation
Guide
JKSSS Series Solid State Soft Starters
TOSHIBA
7
1.6.3 Run Mode: The soft starter enters the Run Mode when it reaches full output voltage and the motor current drops
below the FLA setting (motor nameplate FLA plus service factor) for a pre-determined period of time. During the
Run Mode these additional protection features are enabled:
•Running Overload Curve
•Phase Loss
•Under Current / Load Loss
•Over Current / Electronic Shear Pin (Jam Protection)
•External Input Faults
.
1.6.4 Stop Mode: Once a Stop command has been given, the protection features change depending on which Stop
Mode is selected.
•Decel Mode: Retains all protection features of the Run Mode. At the end of Decel, the motor will be stopped and
the protection features change as indicated below.
•Coast-To-Stop Mode: Power is immediately removed from the motor and the soft starter returns to the Ready
Mode.
•Additional protection features activated when the stop command is given include:
- Coast-Down / Back Spin Timer
- Starts-per-Hour
-Time between Starts
- External Input Faults
1.7 Thermal Overload Protection
The soft starter plays an important role in the protection of your motor in that it monitors the motor for excessive
thermal conditions due to starting, running and ambient conditions. The soft starter has a Dynamic Thermal
Register system in the CPU that provides a mathematical representation of the thermal state of the motor. This
thermal state information is retained in memory and is monitored for excesses in both value and rate of change.
Input is derived from current imbalances and RTD measurements making it dynamic to all processes involving the
motor. The Soft Starter monitors these conditions separately during the Start and Run modes to provide proper
thermal overload protection at all times.
1.7.1 Start Mode overload protection is selectable using one of three methods:
•Basic Protection: I2t data is accumulated and plotted based on an Overload Curve selected in programming.
This is programmed per NEMA Class 5-30 standard curves and is based on the Locked Rotor Current (from the
motor nameplate) as programmed into the Soft Starter.
•Measured Start Capacity: The user enters a measured amount of thermal capacity from a pre-selected
successful start as a setpoint to the Thermal Register for the soft starter to follow.
•Learned Curve Protection: The user sets the soft starter to the “LEARN” mode and starts the motor under
normal starting conditions. The CPU then samples and records 100 data points during the start curve, analyzes
them and creates a graphical representation in memory. The soft starter is then switched to Curve Follow
protection mode and monitors motor performance against this curve. This feature is especially useful in initial
commissioning tests to record a base line performance sample (in this case, it is not necessarily used for motor
protection).
1.7.2 Run Mode overload protection is initiated when the soft starter determines that the motor is At-Speed. Overload
Protection is initiated when the motor RMS current rises above a “pick-up point” (as determined by the motor
nameplate FLA and service factor). Run mode protection is provided by the CPU monitoring the Dynamic Thermal
Register. Data for the Dynamic Thermal Register is accumulated from I2t calculations and cooling rates. A trip
occurs when the register reaches 100% as determined by the selected Overload Protection Curve (NEMA Class
5-30 standard curves) and is based on the programmed Locked Rotor Current indicated on the motor nameplate.
The Dynamic Thermal Register is altered, or “biased”, by the following conditions:
•Current Imbalance will bias the register higher to add protection from additional motor heating during a current
imbalance condition.
•Normal Cooling is provided when the motor current drops below the pick-up point or the motor is offline. The
cooling rate is lower for motors that are off-line (such as after a trip) since cooling fans are also inoperative.
•RTD Input will bias the register in either direction based on real-time input of the motor, bearing and even
ambient temperature conditions.
•Dynamic Reset is another feature that adds reliability and consistency to the performance of the soft starter. If a