Selco Genesis 1700 AC/DC, Руководство по ремонту

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13) CALIBRATIONS
Calibrations procedure
Following description is for calibration procedure, for offset signal and gain signal.
The offset calibration (set.up 704) should be performed in case of complete or partial sw reflashing , or in case the measurement
in no load circuit are different from “0”. The calibration is not required in case of pcb replacement (boards are just Factory cali-
brated) or first customers setting.
The gain calibration (set.up 701) should be performed only if the real output parameters exceed the maximum tolerance admitted
(± 2,5% maximum rated welding current).
13.1) Offset calibration (only for unit with FP 15.22.279)
• Set the power source in TIG DC mode, not particular adjustment are required as well setting.
• Short circuit the output & socket, a big cable section is not necessary, just simple short circuit with cupper clamp
(the calibration will be done at zero current, see fig. 13 A).
• Press and hold the encoder /button till enter on set up menu (0 mark on display).
• Turn clockwise till 500 is marked, then valid with encoder and rotate to Serv menu then again valid, turn clockwise the encoder
to reach code 358 (password).
• On 358 valid again pressing encoder and turn clockwise to parameter 704 (offset adj. will appear on screen see fig. 13 B) then
valid using button v and will appear hourglass picture for a while; after automatically return to show on screen 704.
• Turn anticlockwise to set-up 0 and exit, otherwise for faster exit on set-up 704 press directly button save&exit.
The calibration is done!
Fig. 13 A Fig. 13 B
13.2) Current calibration (to be done after 704 calibration)
• Set the power source in TIG DC mode, not particular adjustment are required as well setting. Suggested current value to do the cali-
bration is at 200 (150) amp.
As alternative could be used the MMA process connected to relative static load, in case consult sec. instruments and conventions for
right powering. The calibration preview current circulation in this sense connect all necessary tools for measurement and welding (see
fig. 13C).
• Press and hold the encoder/button till enter on set up menu (0 mark on display).
• Turn clockwise till 500 is marked, then valid with encoder and rotate to Serv menu then valid again, turn clockwise the encoder to
reach code 358 (password).
• On 358 valid pressing encoder and turn clockwise to parameter 701 (current adj. will appear on screen see fig. 13 D).
• On 701 valid and activate the switch torch button for TIG welding or connect the static load for MMA welding. The welding unit will
start delivery output current (approximately 200 (150) amp. and the screen will show 784 (factory calibration).
• The calibration demand to equalize the value read from calibrated amp meter instrument to the value 200 amp. (the value that we
just set in the first step). This operation is possible turning the encoder till reached the right amperage. Once the amperage delivered
match with the pre setted value, confirm pressing the encoder.
• Turn anticlockwise to set-up 0 and exit, otherwise for faster exit on set-up 701 press directly button save&exit.
The calibration is done!
Fig. 13 C Fig. 13 D