Kemppi Master MLS 2500 Operation Instructions Manual - 3.3. Cooling Unit Operation

16 – Master(tig) 2500, 2503, 3500, 3503 MLS

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/ 0311

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COPYRIGHT

KEMPPI

OY

Master(tig) 2500, 2503, 3500, 3503 MLS

™

/ 0311 – 17

© 

COPYRIGHT

KEMPPI

OY

A16 Control of current with torch up-down switch always active / active only when selected 

with REMOTE button   

0 always active

A17 Guard functions of cooling unit not activated / activated 

1 activated

A18 Downslope for Minilog and 4T in MTM and MTL panels performed during long switch 

action / after switch operation (normal)   

0 normal

A19 Cooling unit operates on forced control / automatic on/off control  0 automatic

3.2.7. Foot pedal control R11F

First read under “3.2.2.4. TIG welding panel MTL” point “6. Remote control” for installing 

the remote control ready for operation. Foot pedal R11F is used in TIG welding, and its control 

range is adjustable. The minimum value of control range is set with the panel potentiometer 

when the pedal is not pressed, display shows “LO”. Control range maximum is set similarly by 

pressing first the PEDAL LO/HI button on the panel, display shows “HI”. Welding is started 

with a light press on the pedal, the arc ignites to the set minimum current. Welding current 

goes to maximum when the pedal is pressed to the bottom. The arc is broken when the pedal is 

released. Adjust again if necessary.

3.3. COOLING UNIT OPERATION 

(MASTERCOOL 10, MASTERCOOL 12)

The operation of cooling units Mastercool 10 and Mastercool 12 is controlled by the power 

source. The cooling unit pump starts automatically when welding starts. Proceed as follows:

  1.  Start power source.

  2.  Check water level and input flow of the reservoir, add liquid if needed.

  3.  If you use a water-cooled torch you can fill it with water by pressing WATER FILL

(HF CONTACT) button for more than 2 seconds.

The pump operates for 5 another minutes after welding has been finished to cool the water to the 

same temperature as in the machine surrounds. This reduces the need of service.

Thermal overload 

The thermal overload light is lit, the machine stops and display shows COOLER when tempera-

ture control of the machine has detected cooling water overheating. The cooling unit fan cools 

down the water, and when the light goes out welding can be started again.

Water flow signal

Display shows COOLER when water flow is blocked.

3.4. STORAGE

The machine must be stored in a clean and dry room. Protect the machine from rain and direct 

sunshine in places where temperature exceeds +25 °C.