GE GuardSwitch 300 Series User manual

Max.Hp
For AC Motors
Max.
Volt-
age
Max.
Contin
ous
Amp
Rating
AC Volts
Single-
Phase Poly- Phase
600 90 5
200
230
460/575
7½
-
5
-
-
25
30
50
CAUTION
:
Before installing in a nuclear
application, determine that the product is
intended for such use.
WARNING:
Disconnect power
before Installing or servicing.
DESCRIPTION
A General Electric 300/400-
Line full voltage
magnetic combination
starter consists of a
magnetic contactor with a three leg block
overload relay and a manually operated
circuit breaker or disconnect switch. The
disconnect switch may either be fusible or
non-fusible. The non-
fusible disconnect
switch provides a means of m
anually
disconnecting the motor from the line. The
circuit breaker or fusible disconnect switch
provides motor branch short-
circuit
protection. The overload relay provides,
motor protection against running and
stalled motor overload.
The overload relay is provided with a
yellow trip indicator which is located to
the right of the res
et arm, and is visible
when the overload relay is tripped.
FEATURES
1. Strongbox coil.
2.
Overload relay, incorporates a dial
for ± 0% field adjustment of tripping
current, so that it is no longer
necessary to change heaters to
eliminate s
uch problems as nuisance
tripping in hot weather.
3. Overload trip indicator.
4. Straight through wiring.
5. Oversized power terminals will
accommodate up to /0 wire.
6. Starter can be disassembled and
inspected in a matter of seconds.
7. Circuit breaker or disconnect
switch is mechanically interlocked
with the enclosure door to prevent
opening the door until the handle is
moved to the OFF position.
COIL REMOVAL
The encapsulated coil is impervious
to moisture, dirt, and oil. It resists
mechanical damage and failure due
to high humidity. No tools are
required to remove coil.
1. Remove power from device.
2. Press against coil while pulling up
slightly on coil retainers (A—Figure
or 2) and move retainers away from
coil.
3. Withdraw magnet assembly, coil,
molded cover, and movable arm
from device.
4. Withdraw spring clip (B—Figure
or 2) and remove armature from
movable arm.
5. Remove coil from magnet.
6. Replace coil.
7. Reassemble device by reversing
procedure.
2.
Clean magnet mating surfaces of any
dust or foreign matter.
3. Select heaters in accordance with
heater table, which accompanies each
device.
4. Operate movable magnet and
operating arm by pressing on the
nameplate to assure free movement.
5. Mount the starter on a sturdy vertical
support.
6. The overload relay may be reset
manually by depressing and releasing
the reset arm. Overload relays with an
optional normally open contact are
electrically isolated from the normally
closed contact.
7. Provide motor branch circuit
protection in accordance with the
National Electrical Code.
Inst uctions fo
NEMA size3
CONTACT REMOVAL
Movable contacts can be inspected
and replaced in seconds—without
tools (Figure 3).
RATINGS
INSTALLATION
Before connecting the starter:
1. Remove all packing.
DEH
-
40628 Inst uction
These instructions do not purport to cover all details or variations in equipment not to provide for every possible contingency to
be met in connection with installation, operation or maintenance. Should further information be desired or should particular
problems arise which are not covered sufficiently for the purchaser’s purpose, the matter should be referred to the GE Company.
Combination
Magnetic Sta te s
CR307-CR308, CR310-CR311, CR387, CR390, CR407-CR408
CR410-CR415, CR487, CR490, CR492, CR494 Se ies

Frequency
(Hertz)
115-
120V
200-
208V
230-
240V
-----
460-
480V
575-
600V
60 002 023 003 ------ 004 005
Frequency
(Hertz) 110V
----- 220V 380V 440V 550V
50 002 ----- 003 064 004 005
Ref.No
De cription Catalog Number Quantity Required
1
2
3
4
5
6
7
8
9
10
Coil retainer assembly
Overload relay (3-heater, non- ompensated form, 1 NC onta t)
Overload relay (3-heater, non- ompensated, 1 NO-1 NC onta ts)
Set of stationary and movable onta ts with springs for three pole
Molded over for stationary and movable onta ts-three-pole
Return spring for movable arm
Molded movable arm for 2-, 3-pole forms
Armature and frame (magnet) with spring retainer
Operating oil for 2-and 3-pole forms
Spring retainer for armature
55-153677G053
CR324E310F
CR324E360F
55-153677G002
55-152655G008
55-152821G005
55-750320P007
55-153677G052
55-501336G***
55-501321P001
2
1
1
1
1
1
1
1
1
1
CHECK FOR WELDED CONTACTS IN
OVERLOAD RELAY
This feature permits the maintenan e
man to he k for welded relay onta ts
by simply depressing the white operator
lo ated at the top of the overload relay
onta t housing. When the relay is in the
reset ondition, an audible “ li k” will be
heard when the operator is depressed,
indi ating that the onta ts are
operating normally. A ontinuity he k
an also be made by dis onne ting the
ontrol wiring from the terminals of the
relay and pla ing a bell set or a
resistan e-measuring instrument in the
ir uit. Conne ting either of these a ross
the relay terminals will indi ate the relay
onta t is losed until the onta t- he k
operator is depressed, opening the
ir uit.
The ex lusive manual onta t operation
he k gives positive assuran e that
onta ts have not welded due to short
ir uits in the ontrol wiring.
SIMPLE MAINTENANCE
300/400-Line starters and onta tors require
virtually no orre tive maintenan e. Preventive
maintenan e will assure many years of
dependable on-line servi e.
1. Always remove power from devi e before
performing any maintenan e.
2. Keep magnet mating surfa es free of
a umulated dirt or dust.
3. DO NOT OIL OR GREASE the magnet mating
surfa es.
4. Conta ts are arefully designed for maximum
life. They need only
be repla ed when nearly all the
silver tip is gone and the onta t tip support is ex
posed. DO NOT FILE the onta ts. Filing or
otherwise dressing the onta ts only results in lost
tip material and redu es onta tor or starter life.
5. The ultimate tripping urrent of the installed
relay heater an be adjusted ±10% by using
adjustment dial.
General Ele tri Company
41 Woodford Avenue, Plainville, CT 06062
DEH-40628 R01 08/10, 10-2049 © 2010 General Ele tri
Visit us on the web at www.Geindustrial. om
1.
Perform steps 1 through 5 under
“Coil Removal”.
2. Remove magnet from molded
over and movable arm.
3. Remove return spring from enter
of movable arm.
4. Remove molded over from
movable arm.
5. Depress and slide movable
onta t, spring, and spring seat from
movable arm.
6.
Remove s rews holding stationary
onta ts in pla e and remove
stationary onta ts
7. Reassemble devi e by reversing
pro edure
PRINCIPAL RENEWAL PARTS
NOTE:
Do not attempt to remove or
repla e ar traps in ar hute over.
When rea
ssembling, note that the
ar hute over will only fit one way and
is marked “TOP”
in upper right hand
orner. Magnet and movable arm will fit
either way but will be quieter if
reassembled the same way they were
taken apart.
*** Insert numbers for parti
ular oil rating required. See Coil Table above
1st NO aux. ont. for Conta tor right side mtg……………. CR3O5X300A
1st NC aux. ont. for Conta tor right side mtg……………. CR3O5X300B
1st NO—NC aux. ont. for Conta tor right side mtg…… CR3O5X300C
Additional NO aux. ont. for all forms……………………………… CR3O5X100D
Additional NC aux. ont. for all forms …………………………… CR3O5X100E
Pushbutton, START-STOP ……………………………………………………. CR305X320B
Sele tor Swit h, H—O—A ………………………………………… CR305X330B
Sele tor Swit h, OFF—ON ………………………………………… CR305X330D
Indi ating Light …………………………………………………………… CR305X350B
Control Cir uit Fuse …………………………………………………… CR305X341A, B, C, D
Surge Suppressor ……………………………………………………………………CR305X146C
Replacement Coil
For two-and three-
pole devi es, order Cat. No.
55-501336G plus number in table below.
For four- and five-pole devi es, ord
er Cat. No.
55-153608G plus number in table below.
Example: 55-501336G002 is rated 115—120 V,
60 Hz/110V, 50 Hz.
Acce ory Kit
Figure 3