Volume 12—Aftermarket, Renewal Parts and Life Extension Solutions CA08100014E—November 2013 www.eaton.com V12-T13-73
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Motor Control
Synchronous—Relay or Solid-State Mark V Slipsyn for Brush and Brushless Motors
Contents
Description Page
Brush Type Relay Slipsyn Class
14-100 Field Application Panel
Product
Description,
Technology
Upgrades . . . . .
V12-T13-75
Brush Type Mark
V
Solid-State
Slipsyn Class 14-100 Field
Application Panel
Product
Description . . . .
V12-T13-77
Replacement
Capabilities,
Technology
Upgrades . . . . .
V12-T13-78
Brush Type Mark
V
Solid-State
Slipsyn Class 14-100 Low
Voltage Motor Starters
Product
Description,
Technology
Upgrades . . . . .
V12-T13-79
Brushless Type Relay Slipsyn
Class 14-100 Field Application
Panel
Product
Description . . . .
V12-T13-80
Replacement
Capabilities,
Technology
Upgrades . . . . .
V12-T13-81
Brushless Type Mark
V
Solid-
State Slipsyn Class 14-100 Field
Application Panel
Product
Description,
Technology
Upgrades . . . . .
V12-T13-82
Relay and Solid-State Slipsyn
Control
Further
Information,
Pricing
Information . . . .
V12-T13-83
Synchronous—Relay or
Solid-State Mark V
Slipsyn for Brush and
Brushless Motors
Product Description
Synchronous Motors
Polyphase synchronous
motors are used primarily to
obtain high pullout torques,
constant operating speed, or
generation of leading reactive
kVA for power factor (PF)
correction. To bring a motor
to a constant speed, DC
power is applied to a special
winding in a synchronous
motor. This winding is called
a field coil winding and is
controlled by “field control.”
Power (DC) for a brush type
motor is usually supplied with
the starter and entails using
an exciter. Power (DC) for a
brushless type motor is
supplied by an exciter
mounted on the motor.
Synchronous Motor Control
Synchronous motor “field
application control” generally
includes a synchronous
device to apply DC power to
the motor field circuit at the
optimum speed. It may also
include protective features
such as locked rotor
protection, failure to
synchronize, incomplete
sequence, field failure,
pullout protection, etc.
depending on the type of field
application control selected.
Relay Type vs. Solid-State
Type—Mark V
Relay Type
The relay type used the ASR
synchronizing relay. Inherent
in using the relay type are the
problems that are associated
with using contacts or
mechanical closing devices
such as arcing, spring and
bearing deterioration and
wear, dirty atmospheres, etc.
Solid-State—Mark V
The Mark V is 100% solid-
state and features a “soft-
turn-on” circuit that applies
DC field voltage to the motor
field. It enables all required
functions for correct
synchronization to be
accomplished without the
use of moving contacts or
mechanical closing devices.
With the Mark V, the static
exciter power supply is
always supplied and is part of
the “system.”
Also available as a modification
with the Mark V is a VAR or
power factor, DC field current
regulator. The regulator
consists of a printed circuit
board, auxiliary devices
and potentiometers for
adjustment.
Product History
Originally a Westinghouse
Product
Synchronous Motor Control
Brush type synchronous field
control was originally
available in the 1940s. Motor
starters for brushless
synchronous motors have
been offered since the late
1960s. Synchronous motors
can be medium voltage
(2300–7200V) or low voltage
(600V and below). A
synchronous motor starter
includes the basic motor
control PLUS the
synchronous control and
protection functions.
Typically, the basic motor
control and the field
application control are
mounted in separate
compartments within
the starter. Ratings of
synchronous control are in
terms of the maximum DC
field amperes required by the
motor. Current ratings are 45,
90, 135, 160, 200 or 270A
DC, through 6000 hp at 5 kV.
Relay and Solid-State Type
Control
Relay type Slipsyn was
introduced in 1947 and uses
the ASR synchronizing relay.
Forms of solid-state type
Slipsyn were introduced in
the late 1950s and early
1960s, but were not
completely solid-state and
had some of the operation
problems that the relay type
control encountered. These
were called Mark I and Mark
II Static Slipsyn. In 1989, the
Mark V Solid-State Slipsyn
field control was introduced.
Medium Voltage (AMPGARD®
)
Starters
The AMI AMPGARD
synchronous starter (1957–
1970) used a 60-inch deep
enclosure with the
synchronous control in the
low voltage section in the
front bottom two thirds of the
starter enclosure. The basic
motor control was located in
the rear bottom two thirds of
the enclosure, barriered off
from the low voltage section.
The AMI AMPGARD for
synchronous motors used the
ASR relay type control.
The LF AMPGARD (1962–
1988) primarily used the ASR
field application relay control.
Mark I and Mark II Static
Slipsyn were also used during
their availability periods. The
LF AMPGARD for synchronous
motors included the basic
induction motor control (ISO®
switch, contactor and starter
control) in the bottom half of
the structure.