Always check unit before applying power (see Section 10-1).
TM-257 220 Page 53
XMT 450 CC/CV
10-14. Inverter Control Boards PC1 Test Point Values
a) Tolerance −
±
10% unless specified
b) Reference − to circuit common
(lead 42) unless noted
PC1 Voltage Readings
Receptacle
Pin
Type
Value
RC1
1
Input
Output reference; 1 volt DC per 60 amperes of weld output when machine is under load. When at
idle and mode switch in TIG and Adjust Control set at minimum = 0 volts DC, maximum = 10 volts
DC. With mode switch in MIG and Adjust Control set at minimum = 1.0 volts DC, maximum = 3.8
volts DC.
2
Input
Voltage feedback; 1 volt DC per 10 volts of weld output
3
Output
Current feedback; 1 volt DC per 100 amperes of weld output
4
Not used
5
Input
Output enable; 0 volts DC = On, +5.3 volts DC = Off
6
Not used
7
Input
Power up reset; 1 ms off pulse when S1 turned on, +3.3 volts DC at idle
8
Input
Gas valve enable; +24 volts DC = valve closed (no gas flow), less than +1 volts DC = valve open
(gas flow)
9
Input
Fan enable; +5 volts = fan On, -28 volts DC = fan Off
10
Not used
11
Output
Primary circuit over current detect; 0 volts DC = OK, +5 volts DC = primary circuit fault = HELP 1
12
Not used
13
Input
+5 volts DC reference voltage for thermistor
14
GND
Circuit common referenced to chassis
15
Output
Secondary side thermistor return; +2 volts DC at 25
°
C thermistor temperature
16
GND
Circuit common referenced to chassis
17
Output
Primary side thermistor return; +2 volts DC at 25
°
C thermistor temperature
18
GND
Circuit common referenced to chassis
19
Output
Primary circuit control detect; 0 volts DC = OK, +15 volts DC = primary control fault = HELP 6
20
GND
Circuit common referenced to chassis
21
Output
+24 volts DC; unregulated DC voltage with respect to GND; power feed to front panel board
22
Output
+24 volts DC; unregulated DC voltage with respect to GND; power feed to front panel board
23
Output
-24 volts DC; unregulated DC voltage with respect to GND; power feed to front panel board
24
Output
-24 volts DC; unregulated DC voltage with respect to GND; power feed to front panel board
RC2
1
Output
+5 volts DC reference voltage for primary side thermistor
2
Input
Primary side thermistor return; +2 volts DC at 25
°
C thermistor temperature
RC3
!
Do not measure − High voltage present. Gate signals to IGBT modules
RC4
1
Input
Input capacitor feedback; +282 volts DC with respect to RC4-4 (top+)
2
Not used
3
Input
Input capacitor feedback; +282 volts DC with respect to RC4-6 ()
4
Input
Input capacitor feedback; Reference for pin RC4-1 (top-)
5
Not used
Содержание XMT 450 CC
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