Toshiba VF010H05 - Manual (Page 24)

JKSSS+ Series - 18
JKSSS+ Series 2.3 - 4.2KV
Torque Specs for MV Power
Connections
2.8 - Warnings & Cautions
This section involves working with potentially lethal voltage
levels! Use extreme caution to prevent injury. Pressing “Stop”
push button does not remove AC mains potential.
Do not service this equipment with voltage applied! The unit
can be the source of fatal electric shocks! 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.
Do not connect the capacitors to the load side (motor side)
of the solid state starter. This will cause di/dt damage to the
SCRs when they are turned on.
Do not connect the 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, optional power factor correction (PFC)
caps contactor should be specified. For additional information and
specifications, please contact the factory.
Never interchange the input and output power connections
on the unit. This will cause excessive voltage to the control circuit
logic.
For bus protection, it is strongly recommended to use non-gap
lightning arrestors in areas where lightning is a significant
problem. The arrestors should be mounted on the nearest utility pole.
2.9 - Medium Voltage Power Connections
Use a properly calibrated torque wrench to tighten all MV connections
according to the chart.
Connections
Cable and wire bundles that enter the controller enclosure should be routed to
avoid interference with moving parts. Minimum bending radius for the type of
cable used should be observed.
Power cables should be braced and/or laced to withstand short circuit forces
wherever such cables are unsupported. Power cables should be adequately sized
to carry the motor full load current in accordance with NEC requirements, and
have an adequate voltage rating. Cables should be dressed and terminated as
appropriate to the voltage class and cable manufacturer’s recommendations.
Main power bus (when provided) and horizontal ground bus are supplied with links
to join shipping sections together. These should be installed in accordance with Fig.
5 through Fig. 7.
All access covers, barriers, partitions, etc. that are temporarily removed during installation
must be replaced.
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.
!
Bolt
Size
Torque at Full
Engagement
(ft - lbs)
1/4 - 20 6
3/16 - 18 12
3/8 - 16 18
7/16 - 14 30
1/2 - 13 45
9/16 - 12 68
5/8 - 11 90
3/4 - 10 150
7/8 - 9 240
1.0 - 8 245
CAUTION
CAUTION
CAUTION
CAUTION
WARNING
WARNING