8 – MASTER 5001/0541
© KEMPPI OY
3. OPERATION CONTROL SWITCHES AND
POTENTIOMETERS AND THEIR USE
3.1. MAIN SWITCH I/O
When you use the switch into I-position, pilot lamp H11 on the front wall is lighted and the machine
is ready for use.
Always start and switch off the machine with the main switch, never use the mains plug as a
switch.
3.2. PILOT LAMPS
The pilot lamps of the machine report about the electric operation:
The green pilot lamp H11 for readiness for use is always lighted, when the machine
is connected to mains supply and the main switch is in I-position.
Yellow pilot lamp H12 of thermal protection is lighted when thermostat has released
due to overheating of machine. The cooling fan is cooling down the machine and when
the pilot lamp is switched off, the machine is again ready for welding.
3.3. LOCAL OR REMOTE CONTROL OF WELDING CURRENT
You can control welding current either from local control unit R21 of the machine or from remote
control unit C100C which is connected to remote control connector X14. When you are using the
remote control unit, the switch S21 must be in remote control position:
During the control, the set value of welding current can be seen on current meter display P21
and at the same time the no-load voltage of the machine can be seen on voltage display. During
welding the current meter P21 and the voltage meter P22 show welding current respectively
welding voltage.
Note! Voltage which can be seen during welding on display P22, is terminal voltage of machine,
which is voltage between terminals X11 and X13.
Accuracy of digital meter is as follows:
Accuracy of current true value in respect to real value is ±2,5%, ±2A.
Accuracy of voltage true value in respect to real value is ±2,5 %, ±0,2 V.
Depending on welding cable length and copper cross-section, real arc voltage and meter display
might differ many volts from each other. Error will increase when current is growing. See table in
paragraph “welding and earthing cables”. In current measurement the same error won´t appear.
3.4. OPERATION OF COOLING FAN
In Master 5001 there are two simultaneously operating fans.
– Fan is started for a moment, when main switch is placed into position I.
– Fan is started after welding start after machine has been heated and runs still for 1…10 min
time after welding stop.
– On no-load fan is started in intervals of ca. half an hour for a minute´s time.
