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50/75VCPW-VSR
Breaker To Vacuum Starter Replacement Unit
SECTION 4: DESCRIPTION AND OPERATION
The VCPW-VSR Vacuum Motor Starter Replacement is a medium
voltage (4.76 / 7 .2kV maximum) vacuum starter used for the control
of three phase motors. The SL Contactor has a current rating of
400A.
The SL Contactor utilizes Eaton's vacuum interrupters that exhibit
both a long electrical life and a high interruption capability. Ratings
for the contactor are shown in Table 4.1. The 400 amp contactor
has three Axial Magnetic (A-M) coils at the fixed end of the vacuum
interrupters. The A-M coils establish a magnetic field within the
interrupter during fault conditions. The field disperses the arc during
fault current interruption, allowing the contactor to interrupt a very
high fault current. See Figure 4.2.
WARNING
SATISFACTORY PERFORMANCE OF THESE CONTACTORS IS CONTINGENT
UPON PROPER APPLICATION, CORRECT INSTALLATION AND ADEQUATE
MAINTENANCE. THIS INSTRUCTION BOOK MUST BE CAREFULLY READ
AND FOLLOWED IN ORDER TO OBTAIN OPTIMUM PERFORMANCE FOR THE
LONG, USEFUL LIFE OF THE CONTACTOR.
4.1 CONTACTOR OPERATION
Mechanically Latched Starter
The mechanically latched starter is closed by energizing the starter
control board with the appropriate control voltage at terminals 1 and
2. The control board rectifies the input voltage and applies pulse
width modulated DC output voltage to the coils. The output voltage
is approximately full voltage for the first 200 milliseconds after
Tablt 4.1. SL CNnoacoNr Raoings
Maximum Interrupting Current (3 OPS.)
Rated Current
Maximum Rated Voltage
Making/Breaking Capacity
Short Time Current
30 Sec.
1 Sec.
8.7 MS (0.5 Cycle)
Mechanical Life
Electrical Life
BIL
Dielectric Strength (60 Hz)
Closing Time
(Energized To Contact Touch)
Opening Times
Arcing Time
Pickup Voltages
Dropout Voltage
8500 Amps (SL -400)
400 A Enclosed
7 .2kV
4000 Amps
2400 A
6000 A
63kA Peak
(l
t = 5.89mega-joles)
2
2,500,000 Operations
300,000 Operations
60 kV (1.2 x 50 Milliseconds)
20 kV (1 Minute)
80 Milliseconds
30 to 330 Milliseconds
Dip Switch Selectable
Refer to Table 5.2
12 ms (0.75 Cycle) or less
80% Rated Coil Voltage
60% Rated Coil Voltage
Instruction Book IB02707112E
energization, during which time the starter closes and seals. After
the starter is electrically closed, a mechanical latch is engaged that
holds the moving armature plate in the closed position. Power is
then removed from the control board. Refer to Figure 4.1, for typical
schematic for latched contactor.
To open the starter, the unlatch coil is energized with the appropriate
control voltage. The coil engages a release lever on the latch
mechanism. The starter is then forced opened by the return spring.
Mechanical opening is also provided.
Control Scheme
A position switch contact is in the contactor closing circuit, which
remains made while the contactor is being racked between the Test
and Connected positions. Consequently, it prevents the starter from
closing automatically, even though the control switch close may have
been made while the starter is racked to the connected position.
When the close contact is made, the MX closes the starter. If the
close contact is maintained after the starter closes, the Y-relay
is picked up. The Y/a contact seals in Y until the close contact is
opened. The Y/b contact opens the MX circuit, so that even though
the starter would subsequently open, it could not be reclosed before
the close contact was released and remade. This is the antipump
function.
Auxiliary Contacts
An operating lever attached to the rotating shaft operates a set of
auxiliary contacts located on each side of the starter (Figure 4.2).
The standard configuration is 3NO-3NC contact on each side of the
starter. The auxiliary contacts are rated 600V, 10 amps continuous.
Minimum ratings are 5 volts, 100 milliamps. Refer to Table 5.1 for
make/break ratings.
Control Voltages
AC
DC
Control Circuit Burden
Closing (200 Milliseconds)
110/120 AC, 125 DC
20/240 Ac
Holding
110/120 AC, 120 DC
220/240 AC
Auxiliary Contact Rating
Voltage (Max)
Continuous Current
Making Capacity
Breaking Capacity
Min. Voltage/Current
Latch
Mechanical Life
Trip Voltage
Min. Trip Voltage
Trip Burden
(24 vDC)
(125 vDC)
(110 vAC & 120 vAC)
Trip Time
EATON CORPORATION www.eaton.com
August 2015
Selectable: Refer to Table 5.1
110/120, 220/240, 50/60 Hz
1 kVA
1.8 kVA
40 VA
50 VA
600 V
10 A
(AC)
7200 VA
(DC)
125 VA
(AC)
720 VA
(DC)
125 VA
5V/100mA
250,000 operations
(DC)
24 Volts
(DC)
125 Volts
(AC)
110/120 Volts
80% Rated Coil Voltage
400 VA
400 VA
400 VA
30 M sec (2 cycles)
11
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