Instruction manual

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KRB-5377

Table 43 Detailed inspection procedure

Check point No. Check item Description

1 Coil resistance

Disconnect hand connector (red) and, using tester, measure coil resistance between terminals and make

sure holding coil is rated at 410 - 510 Ω and attraction coil at 5.6 - 6.8Ω. (*) If not so, replace UVT.

2 Operation

Remove UVT and press in plunger, and make sure releasing plunger causes plunger to be smoothly

restored. If not so, replace UVT.

Length and

stroke of

plunger

Remove UVT and, using vernier caliper, make sure plunger length is 32.5 - 33.5mm in natural state and

plunger stroke is 6.5 - 7.5 mm. If not so, replace UVT.

Hand

connector

Check that hand connector (red) is connected to ACB hand connector (red) correctly. If incorrect ,

connect correctly.

Undervoltage

trip device

(UVT)

See 6-2-1.

Looseness of

screws

Check UVT mounting screws for looseness. If loose, retighten.

With ACB open, remove arc chamber and, using compass and vernier caliper, make sure distance

between moving and stationary contact tips falls within the following ranges. If not so, replace both

moving and stationary contacts. If it is useless to replace contacts, contact us.

Line side Load side

Distances between moving and stationary contact tips(mm)

Types

phase A-C phase N phase A-C phase N

AR208S, AR212S, AR216S, AR220S, AR325S, AR332S, AR440S(3P),

AR440SB(3P)

17-20.5 16-20 17-20.5 16-20

AR440S(4P), AR440SB(4P) 17-21.5 17-21.5 17-21.5 17-21.5

Parting

distance

AR212H, AR216H, AR220H, AR316H, AR320H, AR325H, AR332H, AR420H,

AR440H

17-20.5 16-20 16-20 16-20

Contacts

See 6-2-2, 6-2-

3 and 6-2-4

7En

ement

Insert 3.5 - 4.0-mm-dia x 50-mm-length rod into engagement measuring hole vertically until it stops, and

measure protrusion of rod when ACB is open and closed. Make sure difference in protrusion is following:

line side; 2.7-3.4mm, load side; 2.7-4.0mm. (The difference of the value of line side and load side must

not exceed 1.0mm.) If not so, replace both moving and stationary contacts. If it is useless to replace

contacts, contact us.

Current sensors

See 6-2-3.

Looseness of

screws

Check current sensor mounting screws for looseness. If loose, retighten.

9 Coil resistance

Disconnect hand connector (green) that is closer to coil than the other and, using tester, measure coil

resistance between terminals and make sure it is within range specified in Table 11. (*) If not so, replace

LRC.

Length and

stroke of

plunger

Remove LRC and, using vernier caliper, make sure plunger length is 24.2 - 24.8 mm in natural state and

protrusion of plunger is 6.3 - 7 mm when moving core is pushed in. If not so, replace LRC.

Hand

connector

Check that hand connector (green) is connected to ACB hand connector (green) correctly. If incorrect,

connect correctly.

Looseness of

screws

Check LRC mounting screws for looseness. If loose, retighten.

Latch release

coil (LRC)

See 6-2-5.

Mechanical

motion

With closing springs charged, check that pushing moving core results in ACB being closed slowly, and

releasing moving core results in the core being restored smoothly. If not so, replace LRC. If it is useless

to replace LRC, contact us. After inspection, open ACB and discharge closing springs.

14 Coil resistance

Disconnect hand connector (black) that is closer to coil than the other and, using tester, measure coil

resistance between terminals and make sure it is within range specified in Table 12. (*) If not so, replace

SHT.

Length and

stroke of

plunger

Remove SHT and, using vernier caliper, make sure plunger length is 24.2 - 24.8 mm in natural state and

protrusion of plunger is 6.3 - 7 mm when moving core is pushed in. If not so, replace SHT.

Hand

connector

Check that hand connector (black) is connected to ACB hand connector (black) correctly. If incorrect,

connect correctly.

Looseness of

screws

Check SHT mounting screws for looseness. If loose, retighten.

Shunt trip

device (SHT)

See 6-2-6.

Mechanical

motion

With ACB closed, check that pushing moving core results in ACB being opened slowly, and releasing

moving core results in the core being restored smoothly. If not so, replace SHT. If it is useless to replace

SHT, contact us. After inspection, discharge closing springs.

19 Coil resistance

Disconnect hand connector (red) and, using tester, measure coil resistance between terminals and make

sure it is 1.8 - 2.2 Ω. (*) If not so, replace MHT.

20 Operation

Remove MHT and pull out moving core slowly, and make sure pushing moving core allows core to be

smoothly retracted and attracted If not so, replace MHT.

Length and

stroke of

moving core

Remove MHT and, using vernier caliper, make sure protrusion of moving core is 6.7 - 7.3mm in pulled-

out state. If not so, replace MHT.

Hand

connector

Check that hand connector (red) is connected to ACB hand connector (red) correctly. If incorrect ,

connect correctly.

Magnet hold

trigger (MHT)

See 6-2-8.

Looseness of

screws

Check MHT mounting screws for looseness. If loose, retighten.

Charging motor

and LRC

Electrical

operation

With breaker body assembled to original state, move breaker body to TEST position, supply ACB with

operation power, and attempt to perform motor charging and electrical closing operation with max. and

min. voltages within permissible charging/closing voltage range to make sure ACB operates normally.

(See Table 11). If ACB does not operate normally, contact us.

SHT 25

Electrical

operation

With breaker body assembled to original state, move breaker body to TEST position, close ACB, supply

SHT with power, and attempt to perform electrical opening operation with max. and min. voltages within

permissible closing voltage range to make sure ACB trips open normally. (See Table 12). If ACB does

not trip open, contact us.

UVT 26

Electrical

operation

With breaker body assembled to original state, move breaker body to TEST position, charge closing

springs, and make sure that ACB closes when UVT is supplied with attraction power. And decrease UVT

supply voltage to make sure ACB opening voltage is within specified opening voltage range. (See Table

13.) If ACB does not operate normally, contact us.

OCR and MHT 27 Operation

With breaker body assembled to original state, check OCR and MHT with type ANU-1 OCR checker

(optional) to make sure ACB operates normally. If ACB does not operate normally, contact us.(AGR-11B)

With the breaker body assembled to the original state, perform the “OCR + ACB” test described in 5-5-2

to make sure ACB operates normally. If ACB does not operate normally, contact us.(AGR-21B,22B,31B)

z Always check the "General" items in Table 42 during the inspection procedure shown in Table 43 above.

* Take care to avoid damaging or deforming terminal pins when bringing tester lead into contact with them.