Always check unit before applying power (see Section 10-1).
TM-257 220 Page 59
XMT 450 CC/CV
10-19.
Front Panel/Display Board PC3 Test Point Values
PC3 Voltage Readings
a) Tolerance −
±
10% unless specified
b) Reference − to circuit common
(lead 42) unless noted
Receptacle
Pin
Type
Value
RC1
1
Output
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
Output
Voltage feedback; 1 volt DC per 10 volts DC of weld output
3
Input
Current feedback; 1 volt DC per 100 amperes of weld output
4
Not Used
5
Output
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
Output
Gas valve coil enable; +24 volts DC = valve closed (no gas flow), less than +1 volts DC = valve open
9
Output
Fan enable; +5 volts DC = fan on, −28 volts DC = fan off
10
Not Used
11
Input
Main transformer overcurrent detect; +0 volts DC = OK, +5 volts DC = T1 primary current = HELP 1
12
Not Used
13
Output
+5 volts DC reference voltage for thermistors
14
GND
Circuit common referenced to chassis
15
Input
Secondary side thermistor return; +2 volts DC at 25
°
C thermistor temperature
16
GND
Circuit common referenced to chassis
17
Input
Primary side thermistor return; +2 volts DC at 25
°
C thermistor temperature
18
GND
Circuit common referenced to chassis
19
Input
Primary circuit control detect; 0 volts DC = OK, +15 volts DC = HELP 6
20
GND
Circuit common referenced to chassis
21
Input
+24 volts DC, unregulated DC voltage with respect to GND, power feed to front panel pcb
22
Input
+24 volts DC, unregulated DC voltage with respect to GND, power feed to front panel pcb
23
Input
−24 volts DC, unregulated DC voltage with respect to GND, power feed to front panel pcb
24
Input
−24 volts DC, unregulated DC voltage with respect to GND, power feed to front panel pcb
RC2
1
Input
Negative weld output terminal; used for output voltage feedback
2
Not Used
3
Input
Positive weld output terminal; used for output voltage feedback
Содержание XMT 450 CC
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Страница 83: ...Notes...