Rockwell Automation 509 User Manual

505 z 509

FULL VOLTAGE STARTERS z SIZE 8

SERIES B CONSTRUCTION

BULLETIN

CONTACTS

contacts are of cadmium oxide silver. Square, solid
seating prevents twisting or sliding motion and
extends contact life.
These contacts should not be filed or dressed.

- The weld-resistant, double break

Removal of the contact block cover makes the

mounting screws for the front stationary contact
assembly accessible. The contacts are brazed on
heavy copper parts which are attached to the
stationary contact block by two screws. Remove
these screws and extract the front stationary contact
assembly by depressing the movable contact. To
take out the rear stationary contact assembly, simply
remove the coil cover and slide out the cross bar
assembly, which includes the following items: cross
bar, push rod assemblies, and the magnet armature
assembly. With the cross bar assembly out, the
mounting screws for the rear stationary contacts
accessible and they can be removed along with the
arc quenchers which are attached to the stationary
contact block.

Knowledgebase Technotes ID # Q18318, can be found at http://support.rockwellautomation.com/

The movable contacts are carried in stainless steel
cages which in turn are mounted in cavities in the
molded portion of the cross bar. This cage assembly
is held in place by a screw which can be loosened
from the underside. Therefore, to replace movable
contacts, it is only necessary to replace the
assembly with a new assembly.

STATIONARY CONTACT BLOCK ­molded contact block has a high degree of
mechanical strength and dimensional accuracy.
Material resists arc tracking and arc blast damage.
Separate arc chambers contain efficient metal arc
quenchers.

To detach the stationary contact block, remove the
contact block cover which is held in place by two
captive screws. Then take out the two contact block
screws which hold the stationary contact block to the
base assembly. The contact block can now be
detached.

CROSS BAR ASSEMBLY

cross bar carrying the movable contacts is molded,
but the movable contacts are carried in stainless
steel cages which in turn are mounted in cavities in
the molded portion. The push rod assemblies are
attached to the cross bar molding with screws which
clamp together two sides of a dovetail joint to make
a very rigid connection. The push rod assemblies
are molded with insert studs at the lower end which
are used to fasten the lower cross member which is
a steel plate going through the armature iron. Make

certain that upon replacement the push rod
assemblies lie against the shoulder of the cross
bar.

The cross bar is available less the movable
contacts. However, if the movable contacts are
needed, they can be purchased as a completed
assembly. The push rod assemblies are obtainable
as separate items. The magnet armature assembly
can be disassembled and its parts procured
separately. Part numbers for each item can be found
on Page 3 and 4.

To remove the cross bar assembly: first, detach
contact block cover whish is held in place by two
captive screws; second, loosen the screws on the

- The portion of the

The hot-

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505 z 509

BULLETIN

coil retaining spring; third, loosen the four captive
screws holding down the coil cover; and fourth, slide
off the coil cover. The cross bar assembly, as one
unit, is then lifted out. Disassembly of all parts of the
cross bar assembly is easily accomp-lished by
loosening all the nuts and screws on the push rod
assemblies.

MAGNET ARMATURE ASSEMBLY – The magnet
armature is laminated and is mounted on the
armature plate with a rubber pad to absorb shock
and prolong life. To remove the magnet armature
assembly, loosen the lock nut at the lower end of the
push rods. Note – Removal of the magnet

armature assembly will probably cause the push
rod shims to fall free. Be sure that upon
replacing the magnet armature assembly, the
push rod shims are placed in the same position,
so that consistent overtravel may be maintained.

Take out the retaining blocks located on each side of
the magnet armature. Force the armature plate
through the armature, thereby isolating the magnet
armature. Note - The armature pad, spacer, and

retainer must be replaced in the same order. For
correct replacement, refer to the exploded view
on Page 3.

MAGNET YOKE

and mounted on an aluminum base casting. The
pressure molded coil is mounted with the yoke
projecting into the openings of the coil so that the
coil slides out with the magnet yoke.

OPERATING COIL

in a coil protected against mechanical damage and
the corrosive effects of atmospheric conditions and
protects the coil against swelling when subjected to
over-voltage. Very little trouble can be expected
from the operating coils.

Removing the coil is a simple operation that is
easily performed from the front. First, remove the
coil terminal cover; second, detach the coil leads;
third, loosen the two

screws located on the coil retaining spring; and
fourth, slacken the four captive screws holding down
the coil cover. The coil cover is then lifted out from
the font. Now remove the operating coil and magnet
yoke and detach the yoke from the coil.

To replace the operating coil, first insert the
magnet yoke into the operating coil. After this has
been accomplished, insert both the operating coil
and the magnet yoke, as a unit, into the switch unit

– The magnet yoke is laminated

– Unique high-pressure results

securely. Now replace the coil cover into the switch
unit, but do not tighten the screws on the coil
retaining spring. Be sure to place the auxiliary

contact operating lever into the auxiliary contact
actuator fastened to the cross bar.

on page 3.)

and the four captive screws on the coil cover.
Restore the coil leads and put back the coil terminal
cover.

NOTE

into the control transformers with 120 volt, 60 Hz
secondary.

CONTROL PANEL

capacitor, rectifier, resistors, contact protector,
terminal blocks and control transformer (when used)
– is mounted in a metal cabinet. The cabinet is
normally mounted below the starter, but may be
mounted separate from the starter. The cabinet
(when below starter) is mounted on rubber
grommets to absorb heavy shock during opening
and closing of starter. The control panel has a
hinged cover which can be swung out for inspection
or to check wiring of auxiliary equipment.

BULLETIN 1495 AUXILIARY CONTACTS –

Provisions are made for two auxiliary contacts in
addition to the one which is required for the
economizing action. Each auxiliary contact provides
two independent circuits, either of which can be set
as normally open and normally closed, depending
on the circuit requirements. (

Tighten the coil retaining spring screws

Operating Coil

Coil

Number

107D206

(90V DC)

volts

120 17.6 .392
208 10.2 .226

240 8.8 .196
480 4.4 .093
600 3.5 .078

Coil Current

(Amperes)

Inrush sealed

– Given values are input current (amperes)

- All auxiliary equipment –

See Instructions - Page 6.)

(See instructions

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