Firepower MST 220i, Operating Manual

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FIREPOWER MST 220i
INSTALLATION/SETUP 3-12 Manual 0-5343
8. Negative Welding Output Terminal
The negative welding terminal is used to connect the welding output of the power source to the appropriate
welding accessory such as the MIG gun (via the MIG polarity lead), TIG torch or work lead. Negative welding
current flows to the power source via this dinse type terminal. It is essential, however, that the male plug is
inserted and turned securely to achieve a sound electrical connection.
CAUTION
Loose welding terminal connections can cause overheating and result in the male plug being fused in
the dinse terminal.
9. Remote Control Socket
The 8 pin Remote Control Socket is used to connect remote control devices to the welding power source. To
make connections, align keyway, insert plug, and rotate threaded collar fully clockwise.
Trigger Switch
Remote Wirespeed in MIG (GMAW/FCAW) mode
Remote Amps in LIFT TIG (GTAW) mode
Remote Volts in
MIG (GMAW/FCAW)
1
2
3
4
5
6
7
8
W V
3 4 5
6 7 8
1 2
Negative
Spool Gun Motor
Positive
Art # A-10421_AC
Figure 3-9: Remote Control Socket
Socket Pin
Function
1 Spool Gun Motor Negative
2
Trigger Switch Input
3
Trigger Switch Input
4
Spool Gun Motor (+24V DC)
5
5k ohm (maximum) connection to 5k ohm remote control potentiometer.
6
Zero ohm (minimum) connection to 5k ohm remote control potentiometer.
7
Wiper arm connection to 5k ohm remote control Wirespeed MIG mode potentiometer. Wiper
arm connection to 5k ohm remote control Amps LIFT TIG mode potentiometer.
8
Wiper arm connection to 5k ohm remote control Volts MIG mode potentiometer.
Table 3- 2
Note that the local/ remote switch (item 18) located in the wirefeed compartment should be set to remote for
the amperage/voltage controls to be operative.
10. Multifunction Control - Voltage, Down Slope & Arc Force
The multifunction control knob is used to adjust Voltage (MIG Mode), Down slope (LIFT TIG Mode) and Arc
Force (STICK Mode) depending on the welding mode selected.
NOTE
The preview functionality provided on this power source is intended to act as a guide only. Some dif-
ferences may be observed between preview values and actual welding values due to factors including
the mode of welding, differences in consumables/gas mixtures, individual welding techniques and the
transfer mode of the welding arc (ie dip versus spray transfer). Where exact settings are required (in
the case of procedural work), it is recommended that alternate measurement methods be utilized to
ensure output values are accurate.