Spare Parts; Fault Finding - CEA Z Serie Manual De Instrucciones

Z - NKL
I < I (3030A) therefore the spot welder is suitable for
th th MAX
this job.
EXAMPLE 2 (2 welding programs)
NKLP 28 with two foot pedal (section 8.4) 400V 50Hz
• Pgm1: Welding current = 6000 A
Welding time = 5 periods
10 welding cycle per minute
• Pgm2: Welding current = 8000 A
Welding time = 6 periodi
2 welding cycle per minute
×
(5 10)
=
I
th
3000
× ⋅
(6 2)
=
I
th
3000
I = I + I = 1281 A
th th1 th2
I < I (3030A) therefore the spot welder is suitable for
th th MAX
this job.
NOTE: For 60 Hz mains voltage exchange 3600 instead
of 3000.
11. Maintenance
BE CAREFUL: Always disconnect the welding machine
from the mains supply and set to zero the air pressure by
means of the pressure reducer (pos. O, fig. 2) before
making any inspection of the inner part of the equipment
itself.

11.1 Spare parts

Genuine spare parts are designed especially for our weld-
ing machine. Non-performance and reduction of safety
level may occur when not original spare parts are em-
ployed. We disclaim all responsibility for damages aris-
ing from the use of not original spare parts.
11.2 Maintenance of the mechanical parts
At regular intervals lubricate the moving parts: bar, pivots,
pin joints, etc. Periodically check the manometer setting
which shows the welding pressure. It is also necessary
to check that the cooling circuit is not obstructed or dam-
aged.
11.3 Maintenance of electric and electronic
parts
All parts in which current flows and especially those that
constitute the secondary circuit must be periodically over-
hauled. All linking screws must be tightened. Loose con-
tacts cause power loss. So it is useful to clean the con-
tact surfaces (electrodes, electrode holders, arms, con-
necting units, etc.) using emery cloth. Compensate the
electrode wear by adjusting the electrode holders so that
the two arms are always parallel when the electrodes
are in contact. At regular intervals blow away dust and
dirt from the inside of the welding machine using com-
pressed air. Do not turn the air jet onto the electronic
components or they could be damaged.
24
2
⋅
(6000)
=
7 75 A
2
(8000)
=
506 A
11.4 Programmable electronic control,
thyristors (SCR) and firing circuit
replacement
Replacement of electronic control: If it is necessary
to replace the control, remove the 18 pin connector, re-
move the whole control and replace it.
Replacement of the thyristors: Remove the four con-
nector (K1, G1, K2, G2), the cables and replace the
thyristor-group.
Replacement of the firing circuit: Remove the 10 pin
connector, the fastons and replace the firing circuit.

12. Fault finding

The main supply is almost always the cause of prob-
lems. In case of trouble proceed as follows:
1) Check the line voltage value;
2) Check that the fuses are not blown or loose;
3) Check the correct connection of the mains cable to
the plug and to the switch.