KTM STREAMLINE L-IV 50, Руководство по эксплуатации и обслуживанию, Страница: 106 / 178

SECTION 8
ELECTRICAL SYSTEM
p. 8-3 05148408
8.1.1 Motor Starter Circuit
All horsepower levels of SL-IV Waterjet Pumps are available with built-in
starter/ control panels . Two starter circuits are typically used:
♦
Wye-Delta for reduced voltage starting: Required in Europe and standard on
the SL-IV for motors of 75 hp or greater. Three each 3-phase contactors are
used to accomplish Wye- Delta starting.
♦
Across- the- Line, or Full- Voltage starting: Commonly used in North
America, only a single 3-phase contactor is required.
Electrical power from the utility grid enters the SL-IV Intensifier Pump at the
combination circuit breaker/ disconnect (3). Note that whenever the door to the
electrical enclosure is opened, all electrical power is automatically disconnected
from the intensifier pump. Be aware that 3-phase, medium voltage power is still
present at the input side of the main circuit breaker/ door disconnect. To make
the SL-IV Intensifier Pump electrically safe, one should switch the wall
disconnect (1) OFF and observe LOCK-OUT/ TAG-OUT safety practices. Note
that the wall disconnect (1) should have circuit breakers or fuses, but that this
over current protection may be oversized for the current draw of the particular
SL-IV Intensifier Pump. The primary over-current protection for the SL-IV
Intensifier Pump is the main breaker/ door disconnect (3) built into the
electrical enclosure. On the output side of the main breaker/ door disconnect
(3) main power leads connect to the motor starter contactor(s) (4), then to the
electric motor (6). Secondary power leads connect to two phases of the main
breaker/ door disconnect output side to supply the control circuit.
Other features included in the motor starter circuits include:
•
Manual disconnect with door handle interlock
•
Overcurrent protection
•
Hydraulic unloading during startup, allowing the motor to reach full
speed.
•
9-post motor terminal block for European models.