12
Recommended Tool Kit for Maintenance and Modification of M-PACT Air Circuit Breaker
Cluster Pliers
Used for removal of primary isolating contacts during inspection and maintenance (Part number LLA11YY207).
Flat Bladed Screwdriver - 8 mm
Used for removal of front panel fixing screws and operation of racking shutter drive.
Allen key - 6 mm A/F
Used for removal of horizontal part of spring charging handle to allow complete removal of ACB front fascia.
Allen Key - 5 mm A/F
Used for removal of arc chutes during inspection and maintenance. Also used for removal or adjustment of fixed and moving arcing
contacts.
Metric Feeler Gauges
Used for checking and adjusting arcing contact gap.
Posidrive number 2 screwdriver.
Used for removal of the Rogowski Coil and Power CT cover plate at the rear of ACB moving portion.
Nut Spinner - 7 mm A/F
Used for removal of M-PRO 4 mm fixing nuts.
Nut Spinner - 5.5 mm A/F
Used for removal of PAMM 3 mm fixing nuts.
Terminal Screwdriver
Used for removal of PAMM fixing screws and connection of wiring to Secondary Isolating Contact Terminals.
Allen Key 4 mm A/F
Used for removal of 3 off Motor and Gearbox 5 mm fixing screws.
Allen Key 3 mm A/F
Used for removal of Motor and Gearbox Limit Switch Cam 4 mm fixing screw.
M-PACT Trouble Shooting
PROBLEM POSSIBLE CAUSE SOLUTION
Breaker Won’t close
• Breaker is between CONNECTED, TEST
and DISCONNECTED positions.
• M-PRO has not been reset
• UV fitted and not energised
• Castell or other interlocks are fitted
• Racking handle is inserted
• Cable interlocks fitted
• Rack breaker to CONNECTED, TEST or
DISCONNECTED remove racking handle
and close ACB.
• Push orange M-PRO button & close ACB.
• Energise UV and close ACB.
• Rotate and remove interlock key.
• Remove handel and close ACB.
• Check operational diagram & trip the
relevant ACB
Breaker closes then opens
instantaneously
• M-PRO PAMM connector not inserted
• M-PRO protection settings not set –
• Remote Rogowski coil not fitted the correct
way
• Insert PAMM connector to PAMM module.
• Check that the protection limits have been
set to match system loads. Check that
inputs are set to normally closed trip without
a signal applied
• Re-position coil as illustrated in section 2.
Motor won’t charge Check that the motor actuator is fitted Fit actuator (supplied with kit) see Fig 19.
DC closing coil or UV won’t operate Check the polarity of the connection to the
secondary isolating contacts
Refer to section 3 wiring diagrams
Breaker won’t rack into cassette
• Check that the breaker is pushed fully from
the maintenance position to
DISCONNECTED
• Racking drive not reset
• Push breaker into DISCONNECTED
position.
• Reset racking drive see fig 12.
Earth fault does not operate below
40% setting
For M-PRO 20/30/40: Check that APU is
fitted and energised. M-PRO 17 does not
support settings below 40%
Fit APU and energise. See section 3 for
wiring diagram.
Cannot insert racking handle Shutter padlocks fitted Remove ALL padlocks
Breaker will not go into
DISCONNECTED position
• Incorrect setting of mis-insertion stop.
• Incorrect ACB for given cassette.
• Reset mis-insertion device, see figs 46 & 47
• Check that the ACB & cassette are the
correct pair.
Protection unit healthy indicator not
working
• Check that APU (if fitted) is energised
• Insufficient primary current to power the unit
• Fit APU if not fittted
• M-PRO will power with 40% I
n
single phase
& 20% I
n
3 phase current.
M-PRO not displaying existing fault
after tripping the breaker.
M-PRO set to auto reset – Fault still stored -
check history of trips for fault type
Set M-PRO reset button to manuel.
MODBUS communications not
responding
• Communication set up incorrectly..
• M-PRO baud rate not compatible with host
• Document LLD11DD003 (available upon
request) required to correctly define set up
• Set M-PRO baud rate to match host.
If problems persist please contact our After Sales Service Department.
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