ABB 400 Series Instruções de instalação - Página 2

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5. Remove coil from magnet.

6. Replace coil.

7. Reassemble device by reversing

procedure.

Contact removal

Movable contacts can be inspected

and replaced in seconds —without

tools (Figure 3).

1. Perform steps 1 through 5 under

coil replacement.

2. Remove complete magnet assembly

by pulling entire assembly from the

contactor assembly.

3. With the magnet assembly resting on

its side, remove the movable arm by

sliding it out the back of the assembly.

4. Depress movable contact and spring,

and slide movable contact from

movable arm.

5. Remove screws holding stationary

contact in place and remove stationary

contact.

6. Reassemble by reversing the above

procedure. When reassembling, note

that the cover will fit only one way.

Magnet and movable arm will fit either

way but will be quieter if reassembled

the same way they were taken apart.

NOTE: Do not attempt to remove or

replace arc traps in arc chute cover.

When reassembling, note that the arc

chute cover will only fit one way and is

marked "TOP" in upper right-hand corner.

Stationary

contacts

Stationary

contact

screws

Movable arm

return spring

(not shown)

—

Figure 3 — reference diagram (representation only)

Check for welded contacts

in overload relay

This feature permits maintenance

personnel to check for welded relay

contacts by simply depressing the white

operator located at the top of the overload

relay contact housing. When the relay is in

the reset condition, an audible "click" will

be heard when the operator is depressed,

indicating that the contacts are operating

normally. A continuity check can also be

made by disconnecting the control wiring

from the terminals of the relay and placing

a bell set or a resistance measuring

instrument in the circuit. Connecting

either of these across the relay terminals

will indicate the relay contact is closed

until the contact-check operator is

depressed, opening the circuit. The

exclusive manual contact operation check

gives positive assurance that contacts

have not welded due to short circuits in

the control wiring.

—

Replacement coils

For two- and three-pole devices, order cat. no. 55-536548G plus number in table below.

Example: 55-536548G002 is rated 115–120 V, 60 Hz/110 V, 50 Hz.

Frequency

60 Hz

Frequency

50 Hz

—

Accessory kits

First NO auxiliary contact for CR305, CR306 (right-side mounting)

First NC auxiliary contact for CR305, CR306 (right-side mounting)

First NO-NC auxiliary contact for CR305, CR306 (right-side mounting)

Additional NO auxiliary contact for all forms

Additional NC auxiliary contact for all forms

Surge suppressor

Lug kit ( 1 lug and hardware)

Movable

contacts

Spring

Spring seat

115–120 V

200–208 V

230–240 V

002

023

110 V

–

002

–

Simple maintenance

300/400-line starters and contactors

require virtually no corrective

maintenance. Preventive maintenance

will assure many years of dependable

on-line service.

1. Always remove power from device

before performing any maintenance.

2. Keep magnet mating surfaces free

of accumulated dirt or dust.

3. DO NOT OIL OR GREASE the magnet

mating surfaces.

4. Contacts are carefully designed for

maximum life. They need only be

replaced when nearly all the silver tip

is gone and the contact tip support is

exposed. DO NOT FILE the contacts.

Filing or otherwise dressing the

contacts only results in lost tip material

and reduces contactor or starter life.

5. The ultimate tripping current of the

installed relay heater can be adjusted

±10% by using adjustment dial.

–

460–480 V

003

–

220 V

380 V

440 V

003

064

575–600 V

004

005

550 V

004

005

CR305X500A

CR305X500B

CR305X500C

CR305X100D

CR305X100E

CR305X146C

55-186556G003