Commissioning, Maintenance And Repair - Fronius MTG 250i Instructions De Service

Before switching on the device, ensure that no one is likely to be endangered.
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System cooling Fronius welding torches may only be used with Fronius cooling units and Fronius coo-
lant.
The manufacturer accepts no liability for any damage arising from the use of other coo-
ling systems.
NOTE! Inadequate cooling can cause damage to property. Never operate welding sys-
tems without adequate cooling. The manufacturer accepts no liability for damage caused
by inadequate cooling.
The cooling liquid supply, the purity of the coolant and the differential pressure in the
cooling water system must always be checked before you start the welding system.
Danger of burns from hot coolant.
Do not check coolant until it has cooled down.
Minimum requirements for the con-
nection of a Fronius welding torch to the
cooling circuit of a third-party system:
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Commissioning, It is impossible to guarantee that bought-in parts are designed and manufactured to meet
maintenance and the demands made of them, or that they satisfy safety requirements.
repair -
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Check the device at least once a week for obvious damage and proper functioning
of safety devices.
Only the manufacturer's original coolant is suitable for use with our devices due to
its properties (electrical conductibility, anti-freeze agent, material compatibility, flam-
mability, etc.).
Only use suitable original coolant from the manufacturer.
Do not mix the manufacturer's original coolant with other coolants.
The manufacturer accepts no liability for damage resulting from use of a different
coolant. In addition, all warranty claims will be forfeited.
The coolant can ignite under certain conditions. Transport the coolant only in its ori-
ginal, sealed containers and keep well away from any sources of ignition.
Used coolant must be disposed of properly in accordance with the relevant national
and international regulations. A safety data sheet may be obtained from your service
centre or downloaded from the manufacturer's website.
Check the coolant level before starting to weld, while the system is still cool.
CAUTION!
pressure 3 to 5 bar
coarse filter with mesh size of 10 mm
flow of at least 1 litre/min.
return temperature max. 70 °C
flow temperature min. 10 °C
Use only original spare and wearing parts (also applies to standard parts).
Do not carry out any modifications, alterations, etc. to the device without the manu-
facturer's consent.
Components that are not in perfect condition must be replaced immediately.
When ordering, please give the exact designation and part number as shown in the
spare parts list, as well as the serial number of your device.
Recommended coolant quality in third-
party systems:
- pH value 7 to 8
- hardness D max. 5 °dH
- chloride max. 20 mg/l
- nitrate max. 10 mg/l
- sulphate max. 80 mg/l
- electrical conductibility
100 to 150 mS/cm
- additives to prevent corrosion and
bacterial growth
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