Control Board Pc1 Test Point Values - Miller Electric SYNCROWAVE 250 Technical Manual

6-5. Control Board PC1 Test Point Values

Receptacle Pin
RC51 1
2
3
4
5
6
RC52 1
2
RC53 1
2
3
4
5
6
7
8
RC54 1
2
3
4
5
6
7
8
9
10
11
12
Syncrowave 250
PC1 Voltage Readings
18 volts ac input
18 volts ac input
+10 volts dc output
Circuit common
Not used
Not used
Circuit common
+1 millivolt dc per 3 ampere of weld output
Gate pulse for SCR1 with respect to pin 2 (see Section 6-3)
Reference for gate pulse to SCR1
Gate pulse for SCR3 with respect to pin 4 (see Section 6-3)
Reference for gate pulse to SCR3
Gate pulse for SCR2 with respect to pin 6 (see Section 6-3)
Reference for gate pulse to SCR2
Gate pulse for SCR4 with respect to pin 8 (see Section 6-3)
Reference for gate pulse to SCR4
Not used
0 to +10 volts dc input from min. to max. of Amperage Adjustment control R1 with Amperage Control
switch S5 in Panel position, and contactor on
0 volts with Output (Contactor) switch S3 in On position or +7.8 volts dc with S3 in Remote position
0 to +10 volts dc input from min. to max. of Crater Control R11 with Crater Fill switch S7 in On posi-
tion, or +10 volts dc with S7 in Off position
+10 volts dc output with Output (Contactor) switch S3 in On position
–24 volts dc
–24 volts dc with contactor on or off
0 to +10 volts dc input from min. to max. of Amperage Adjustment control R1 with contactor on
0 to +10 volts dc input from min. to max. of Amperage Adjustment control R1 with contactor on
Circuit common
+24 volts dc
0 volts during open-circuit voltage condition; +24 volts with arc on or contactor off
a) Tolerance
specified
b) Reference – to circuit common
(lead 42) unless noted
Value
– 10% unless
TM-353 Page 31