ABB TMAX XT XT7 Montageanleitung
—
INSTRUCTION HANDBOOK
1SDH002301A1001 - ECN000285442
TMAX XT XT7
Disassembly instructions
3
Disassembly instruction tmaX Xt Xt7
1. SCOPE
Scope of this document is to illustrate the step-by-step disassembly process of ABB SACE Tmax XT XT7
moulded case circuit breaker equipped with an electronic trip unit (type Ekip DIP LS/I).
Document is focused on Tmax XT XT7 3p IEC version, anyway it allows to cover other versions of Tmax
XT XT7 circuit breaker with just few slight differences to be taken into account.
Gloves Glasses Safety shoes Protective clothes
4. TOOLS
Disassembly operations require the use of tools (e.g. screwdriver, torx key, pliers, …); tools to be used
are specified inside each phase of the disassembly process (see Chapter 6).
3. PERSONAL PROTECTIVE EQUIMENT (PPE)
When performing disassembly, following safety Personal Protective Equipment (PPE) must be worn:
2. SAFETY NOTES
Before proceeding with any disassembly operation, it’s mandatory to put the circuit breaker in open
position.
Disassembly operations of circuit breakers must be performed by qualified and skilled personnel in
the electrical field (IEV 195-04-01: person with relevant education and experience to enable him or her
to perceive risks and to avoid hazards which electricity can create) and having a detailed knowledge of
circuit breakers.
Disassembly activites must be performed in an ergonomic workspace able to ensure protection of per-
sons demanded to perform disassembly activities.
Applicable national legislation and international standards in force at the time of disassembly of circuit
breakers must be taken into account in addition to prescriptions illustrated in this document.
ABB declines any responsibility for injury to people or damage to property resulting from a failure to
comply with the instructions set out in this document and with any applicable safety standard.
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INSTRUCTION HANDBOOK
If disassembled parts require a separate treatment a specific indication is provided inside each phase
with reason why for the separate treatment (see Chapter 6).
Description Position inside circuit breaker Quantity
Cap kits In correspondence of circuit breaker connection terminals
Support Mounted on the upper part of the circuit breaker
Cables protection Mounted on the back part of the trip unit
Rating plug case Mounted on the front of the trip unit
Rating plug printed circuit board In the rating plug case
Backplane Mounted on the back part of the trip unit
Trip unit case On the trip unit
Trip unit back cover On the trip unit
Trip unit printed circuit board In the trip unit
Left MID cover Mounted on the left part of the circuit breaker
Left MID Mounted on the left part of the circuit breaker
Left base Mounted on the left part of the circuit breaker
Block lever Mounted on the left part of the circuit breaker
Trip coil In the trip coil group
Trip coil group Mounted on the left part of the circuit breaker
Trip test support Mounted on the right part of the circuit breaker
MID Mounted on the right part of the circuit breaker
SY lever Mounted on the MID
Wires cover Mounted on the left part of the circuit breaker
Wiring Mounted on the left part of the circuit breaker
Operating mechanism Mounted on the center of the circuit breaker
Unlocking shaft appendices Mounted on the pin of the operating mechanism
Lever extension Mounted on the front toggle
Protections Mounted on the upper case assembly
Fixed contacts protections Mounted on the fixed contacts
Covers Below the sensors
Sensors In the bottom part of the circuit breaker
Insulation protections On the moving contacts assembly
6. DISASSEMBLY PROCESS
Circuit breakers disassembly process is constituted by a sequence of operations to be performed on
products after their dismounting from original installation. For each phase following information are
provided:
applicable)
5. SEPARATE TREATMENT
Table below lists parts requiring a separate treatment adding information about part location inside
circuit breakers and related quantity.
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Disassembly instruction tmaX Xt Xt7
Tools
Allen key
Flat screwdriver
6.1 PHASE 1 – CAP KITS
1
By means of the cross screwdriver unscrew
the 2 screws fixing the terminal clamp to the
circuit breaker main structure.
4
By means of the flat screwdriver push the cap
kits in order to remove them from the circuit
breaker main structure.
3
By means of the allen key remove the screws
connected with the cap kits and after manually
remove the plates.
2
Manually remove the terminal clamp.
Actions to be performed
8mm
Cross screwdriver
6
INSTRUCTION HANDBOOK
(Metal)
containing brominated flame
retardants)
Disassembled parts
5
By means of the flat screwdriver remove the
nuts mounted on the cap kits.
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Disassembly instruction tmaX Xt Xt7
6.2 PHASE 2 – CIRCUIT BREAKER FRONT COVER AND OPERATING
MECHANISM COVER
6
Manually push the trip unit transparent
protection as indicated by the arrow and
remove it.
8
By means of the cross screwdriver push the
trip test button.
7
Manually close the circuit breaker pushing the
toggle in the direction indicated by the arrow.
9
By means of the cross screwdriver unscrew the
2 screws located in the lower part of the circuit
breaker fixing the circuit breaker front cover to
the circuit breaker main structure.
Actions to be performed
Tools
Torx key
No. 8
Cross screwdriver
Pliers
8
INSTRUCTION HANDBOOK
10
Manually lift the circuit breaker front cover to
complete the removal.
12
By means of the tork key remove the 4 screws
fixing the 2 keylock caps to the circuit breaker
front cover.
11
By means of the pliers remove the trip test
button.
15
By means of the cross screwdriver, unscrew
the 2 screws located in the upper part of the
operating mechanism front cover fixing the
operating mechanism cover to the circuit
breaker main structure.
13
Manually remove the upper keylock cap.
14
Manually remove the lower keylock cap.
9
Disassembly instruction tmaX Xt Xt7
16
By means the cross screwdriver, unscrew the
2 screws located in the bottom part of the
operating mechanism front cover fixing the
operating mechanism cover to the circuit
breaker main structure.
17
Manually lift the operating mechanism cover.
protection (Plastic)
(Plastic)
(Plastic)
Disassembled parts
10
INSTRUCTION HANDBOOK
6.3 PHASE 3 – TRIP UNIT
Actions to be performed
Tools
Cross screwdriver
Torx key
No. 20
No. 8
Flat screwdriver
Cutter
Pliers
18
By means of a cross screwdriver unscrew the 2
screws fixing the support to the circuit breaker
main structure.
20
By means of the cross screwdriver unscrew
the 2 screws located in the bottom part of the
trip unit and fixing the trip unit to the circuit
breaker main structure.
19
Manually remove the support.
21
By means of the torx key (size 20) unscrew the
2 screws located over the trip unit fixing the
trip unit to the circuit breaker main structure.
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