Repair manual

14
Air inlet fan fastened to the back (fig. 2B)
Primary board (fig. 6):
Auxiliary power supply board (fig. 3)
Auxiliary transformer (fig. 3)
Secondary board (fig. 5):
Power transformer and inductance assembly (fig. 3)
HF transformer (fig. 5)
Parts fastened to the base (fig. 4)
Main power supply switch (fig. 2B)
Current potentiometer control board R1 fig. 2A
Post-air button (fig. 2A)
Relays K1, K2 on primary board (fig. 6)
Electrolytic capacitors C1, C2, C1A, C2A, C4, C5, C4A, C5A on
primary board (fig. 6)
IGBT's 1, 2, 3,4, 5, 6, 7, 8,9, 10 (fig. 6)
Primary diodes D6, D8, D9,D10 (fig. 6)
Secondary diodes D1, D2, D3,D4, D5 (fig. 5)
Hall-1 and Hall-2 sensors (fig. 5)
Power transformer and filter inductance (fig. 3)
Input filter board varistors RV1, RV2, RV3 (fig. 4)
Relays K1, K2 and K3 on auxiliary control board (fig. 3)
elays K3 and K4 on HF filter board (fig.4)
HF transformer (fig. 5)
Air unit assembly (fig. 4)
Torch (fig. 1A)
Check whether dirt is adversely affecting correct rotation of the
blades;if there is still damage after cleaning replace the fan.
- rheofores of IGBT's 1 , 2, 3, 4, 5, 6, 7, 8, 9, 10;
- rheofores of recirculating diodes D8, D10;
- rheofores of snubbernetwork diodes D6, D9;
- zone for connection with the black box (contains the board to
which the opto-isolators of the driver circuit are attached).
To get at the inside of the metal structure undo the 4 screws (2 on
each side) that fastenthe presspan insulator to the structure.
- powerdiodes D1, D2, D3, D4, D5;
- thermostatic capsule on dissipator;
- HALL-1 and HALL-2 sensors.
In this case it is necessary to removethe primary board, or else it is
possible to clean the part superficially from the sides of the metal
structure.
If the base is removed, carefully clean all the components
attached to the structure:
- air unit assembly;
- input filter board;
- HF board;
- HF filter board;
- auxiliarycontrol board.
Make sure there is no mechanical deformation, dent, or damaged
and/or disconnected connector. Make sure that the power supply
cable has not been damaged or disconnected internally and that
the fan operates when the machine is switched on. Inspect the
components and cables listed below for signs of burning or breaks
that may adversely affect operation of the power source.Check the
following parts:
Use the multimeter to check whether the contacts are stuck
together or open.Probable cause:
- mechanical or electrical shock (e.g. rectifier bridge or IGBT's
shorted, handling under load).
Probablecause:
- mechanical shock.
Probablecause:
- mechanical shock.
Probablecause:
- see the power supply switch; If the relay contacts are
stuck together or dirty, do not attempt to separate or clean
them, just replace the relay.
Probablecause:
- mechanical shock;
- machine connected to a much higher voltage than 400Vac;
- rheofore of one or more capacitor broken: any that remain will
be subjected to excessive stress and will be damaged by
overheating;
- ageing after a substantial number of workinghours;
- overheating due to failed operation of the thermostatic
capsules.
Probablecause:
- break in snubber network;
- control circuit failure (driver);
- poor thermal contact between IGBT's and dissipator (e.g.
loosened fastening screws:check);
- excessiveoverheating related to faulty operation.
Probablecause:
- excessiveoverheating related to faulty operation.
Probablecause:
- break in snubber network;
- poor dissipator-diodes thermal contact (e.g. loosened
fastening screws:check);
- faulty conditions at machine output.
Checkthem for colour changes.Probable cause:
- overheating due to loosening of the screws connecting the
shunts to the secondary circuits.
Probablecause:
- powersupply voltagemuch greater than 400Vac.
Probablecause:
- see the main power supply switch ; If the contacts are
stuck together or dirty, do not attempt to separate or clean
them, just replace the relay.
Probablecause:
- see the main power supply switch. If the relay contacts are
stuck together or dirty, do not attempt to separate or clean
them, just replace the relay.
Probablecause:
- see the power transformer;
Inspect the operation of the followingcomponents:
- pressure gauge;
- pressure switch;
- solenoid valves;
- torch connector;
- miscellaneous connecting pipes and hookups.
Maintenance status, referring to the instructions given in the
instruction manual. Condition of parts not subject to wear of the
connecting cable between torch and machine (insulation).
It is important to make sure that all the connections are in good
condition and that the connectors are inserted and/or attached
correctly.To do this, take the cables between finger and thumb (as
close as possible to the fastons or connectors) and pull outwards
gently: the cables should not come away from the fastons or
connectors. If the power cables are not tight enough this
could cause dangerous overheating.In particular it is necessary to
makethe following checks on the :
wiring (JP3) towards primary board (JP5), auxiliary control
board (JP10 and JP5) and ammeter shunt (TA);
wiring (CN2X) towards auxiliary control board (CN2);
wiring (JP2) towards the thermostatic capsules, pressure
switch and HF filter board (J5).
In particular, it is necessary to make the following checks on the
:
connections RF, SF,TF of the 3 phases to the main switch and
downstream of the switch itself: input filter board and power
supply cable;
the 2 connections between primary board and power
N.B.
N.B.
R
N.B.
N.B.
controlboard(fig.7)
-
-
-
primary board(fig.3)
-
-
3.0 Visual inspection of the machine
4.0 Checking the power and signal wiring
()
control board assembly S1
Inspect the windings forcolour changes.
- ageing after a substantial number of working hours;
- excessiveoverheatingrelated to faultyoperation.
SUPERIOR PLASMA 90 HF