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Basic Installation and Operation
Guide
• Gate Drive Boards are located directly on the SCR stacks. These boards communicate to the Main Power
board via fiber optic cables. They amplify the gate pulse signals with power from the Ring Transformers to
create the Sustained Pulse Firing of the SCRs. There is one Gate Drive board for each pair of SCRs in each
stack.
• Temp / CT Boards are attached to the Gate Drive boards on the SCR stacks and provide the heat sink
Temperature and current signals back to the Main Power Board via fiber optic cables.
• MOV Boards are attached to standoffs mounted on the SCR heat sinks and are mounted directly below the
Gate Drive boards. The MOV boards are used to protect the gate/cathode section of the SCRs.
• DV/DT Boards are also attached to standoffs mounted on the SCR heat sinks and are mounted below the
MOV boards. The DV/DT boards are used to reduce voltage transients across the stack assemblies.
Chapter 2 - Connections
2.1 Warnings
•
Do not service this equipment with voltage applied! The unit can
be the source of fatal electric shock! To avoid shock hazard,
disconnect main power and control power before working on the unit.
Warning labels must be attached to terminals, enclosure and control
panel to meet local codes observing Lock Out, Tag Out procedures.
•
Do not connect (PFC) capacitors or surge capacitors to the load
side (motor side) of the unit. This will cause di/dt damage to the
SCRs when they are turned on and will void the warranty on this
product. Capacitors can only be connected to the load side of the
starter through the use of an isolating contactor which is closed after
the soft starting sequence has been completed or when di/dt limiting
inductors are factory installed.
•
Avoid connecting capacitors to the input side of the unit. If you
cannot avoid using capacitors across the power lines, they must be
located as far upstream as possible of the input line contactor. In this
situation, an optional power factor correction (PFC) capacitor contactor
should be specified. For additional information and specifications or
when di/dt limiting inductors are factory installed, please contact the
factory.
TOSHIBA
DANGER
HAZARDOUS VOLTAGE
Disconnect all power supplying this equipment
prior to working on it.
Failure to follow this instruction will result in
death or serious injury.
JKSSS Series Solid State Soft Starters
DANGER
HAZARDOUS VOLTAGE
Disconnect all power supplying this equipment
prior to working on it.
Failure to follow this instruction will result in
death or serious injury.
CAUTION
!
SCR DAMAGE
Do not connect (PFC) capacitors to the load
side of the unit.
Doing so will cause DI/DT damage to the
SCRs when energized.
WARNING
!
SAFETY HAZARD
Do not bypass electrical or mechanical interlocks.
Failure to follow this instruction will cause severe
equipment damage, serious injury or death.
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