Westweld NB-350MK, Manual Instruction

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8.3 Component list
No. Item Model Code Note
1 Air switch
DZ47-63/3P D40
QF1
NB-350MK
DZ47-63/3P D63 NB-500MK
2 Bridge rectifier
MDS75-12
V1
NB-350MK
MDS100-12 NB-500MK
3 IGBT
GD75HCU120B3S V2 NB-350MK
MMGTU100S120B6C
V2
、
V3
NB-500MK
4 Diode MMF200ZB040DK1
V3
、
V4 NB-350MK
V4
、
V5
、
V6 NB-500MK
5 Hall sensor TKC500BR TA1
6 Control transformer TN06 TC1
7 Cooling fan
150FZY2-D/AC220 reverse
EV1
NB-350MK
200FZY2-D/AC220 reverse NB-500MK
8 PCB PN14 AP1
Table 8 Component list
9 Maintenance and repairing
Note: When maintain or repair, the power must be cut off.
9.1 Maintenance

The user should open the case regularly according to the usage and environmental conditions (at least once a year)
to clean the internal dust with dry compressed air to prevent the dust from being damp and cause short circuit in
the machine to cause malfunction;

The user should check the installation connection regularly, ensure reliable connection.
9.2 Repairing

Only the person holding the electrician's operation permit can repair the welder

Before opening the welding machine, first check the three-phase voltage of the incoming power of the welder,
which should meet the national standards. After the three-phase voltage is normal, check whether the fuse inside
the machine is blown, and then check the welding cable to ensure the connection is reliable and correct.
10 Common faults and eliminating methods
If there some problems that can not be judged or solved, please do not hesitate to contact our company to get
some technical assistance. Please do not repair or open the machine arbitrarily. There is high voltage after cutting power
for 10 minutes, only qualified electrician can operate!