Siemens SIKOSTART 3RW34, Инструкция по эксплуатации, Страница: 19 / 48

Siemens Energy & Automation, Inc. 19
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5.1 Typical Applications
This section contains four wiring diagram sets for typical appli-
cations as follows.
Figure 12 & 13 - Two Single Speed, Non-reversing Motors, Wired
In Line, in a Vented Enclosure
Figure 14 & 15 - Single Speed, Non-reversing Motor, Wired In
Line, with Bypass Contactor
Figure 16 & 17 - Two Single Speed, Non-reversing Motors, Wired
Inside Delta,in a Vented Enclosure, 1 with Isolation Contactor 1
with Shunt Trip
Figure 18 & 19 Single Speed, Non-reversing Motor, Wired Inside
Delta, with Bypass and Isolation Contactors
Each diagram set consists of two sheets: one showing the
power and motor connections and one showing the control
wiring. The SW1 chart at the bottom of the power and motor
diagram indicates the switch settings required for that particular
configuration (refer to paragraph 6.1).
5.2 Circuit Devices
Common Circuit Devices. Some circuit devices common to
each application shown include:
• an overload relay (1OL, 2OL) for motor protection;
• either a circuit breaker (1CB) or a fused disconnect switch
(1DS/1FU) to connect and disconnect main power to the
application;
• a Start/Stop control that is connected so when the start
switch is pushed, the RUN coil in the controller is energized,
and the controller RUN interlock contact closes and latches
in the RUN coil. When the stop switch is pushed or power
is lost, the circuit is broken and the controller drops out
which shuts off power to the motor. If a two wire Start/Stop
control connection is used, the motor may automatically
restart when power is restored to the controller.
Bypass Contactor. The applications shown in figures 14 and 18
include a bypass contactor (2M). The bypass contactor is rated
to handle the running current of the motor but not the starting
current. The bypass contactor remains open until the controller
has soft-started the motor. Once the motor is operating at line
voltage, the Up-to-Voltage contact closes and the bypass con-
tactor is energized causing motor current to flow through the
bypass contactor rather than the controller.
A bypass contactor is useful when the controller is mounted in
a NEMA 4, 12 or other airtight enclosure. When the motor cur-
rent is routed through the bypass contactor, no current is flow-
ing through the controller SCR’s, and the controller generates no
heat.
For both applications, the switch section SW1-1 is set to the
turn off delay position so that the bypass contactor de-energizes
before the controller (refer to paragraph 6.1).
Isolation Contactor. The applications shown in figures 16 and
18 include an isolation contactor. The isolation contactor is ener-
gized when the controller is operating (RUN coil is On) and pro-
vides power to half of the windings of the 6-lead delta motor. If
a controller fault occurs, the fault contact opens which de-ener-
gizes the isolation contactor and the motor stops.
For both applications, switch section SW1-4 is set to open the
fault contact on fault detection and switch section SW1-2 is set
so that the isolation contactor energizes before the controller
(refer to paragraph 6.1).
Shunt Trip . A shunt trip circuit breaker is used on the second
motor in figure 16. The switch section SW1-4 is set to close the
fault contact on fault detection. With the circuit breaker (1CB)
closed and the controller operating (RUN coil is On), the shunt
trip coil is de-energized. If a controller fault occurs, the fault con-
tact closes to energize the shunt trip coil which trips open the
circuit breaker and disconnects power to the controller and
motor.
The figure 16 application shows two methods of using the con-
troller fault contact to stop the motor when a fault occurs: 1) the
fault contact opens to de-energize the isolation contactor for
the first motor (1MTR) and 2) the fault contact closes to oper-
ate the shunt trip on the circuit breaker for the second motor
(2MTR).