Emergency Bypass Operation - Toshiba JKSSS Series Instruction Manual

Basic Installation and Operation
Guide
Check: If the motor decelerates, or stops, during the acceleration period, activate the Stop button immediately.
Adjustments to the ramp time and or current limit setting are necessary to provide the motor sufficient energy to reach full
speed. If the unit does not follow this operational sequence, please refer to the Troubleshooting Chapter.
If the motor does not enter the run mode in the set time (Acceleration time limit, see SP8.2), a trip will occur. When the
Motor Reaches full speed, the At Speed" LED will come on and Aux 4 (At Speed) relay will energize closing the bypass
contactor. Phase A, B, C and Ground Fault current is then shown on the keypad during operation.
IA:_ _ _ IB:_ _ _
IC:_ _ _ GF:_ _ _

3.5 Emergency Bypass Operation

Emergency Bypass
• Remove input power by opening the disconnect switch and lock out.
Close the emergency Bypass contact located on the TCB board at TB2
•
(See section 2.2.1 for location).
Unlock and reclose the disconnect switch.
•
Note: In the emergency bypass mode, there is no overload protection
unless a separate (optional or customer supplier) thermal overload relay is
installed, or JP-1 (Motor Protection Jumper, Sec. 2.9.3) is removed from the
TCB Board.
The unit is operable as a normal across-the-line starter. When power is applied, the bypass contactor is energized, tying
the input terminals directly to the output terminals. When the "START" command is given, the main (in-line) contactor is
energized and the motor starts. When the "STOP" command is given, the motor is disconnected from the line via the main
(in-line) vacuum contactor.
TOSHIBA
JKSSS Series Solid State Soft Starters
DANGER
HAZARDOUS OPERATION
Do not operate the Bypass Contactor
with medium voltage power applied
to the unit.
Failure to follow this instruction will
cause the motor to start
unexpectedly.
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