5. control board pc1 test point values – Miller Electric SYNCROWAVE 250 TM-353E User Manual
Page 35
TM-353 Page 31
Syncrowave 250
6-5.
Control Board PC1 Test Point Values
PC1 Voltage Readings
a) Tolerance –
±
10% unless
specified
b) Reference – to circuit common
(lead 42) unless noted
Receptacle
Pin
Value
RC51
1
18 volts ac input
2
18 volts ac input
3
+10 volts dc output
4
Circuit common
5
Not used
6
Not used
RC52
1
Circuit common
2
+1 millivolt dc per 3 ampere of weld output
RC53
1
Gate pulse for SCR1 with respect to pin 2 (see Section 6-3)
2
Reference for gate pulse to SCR1
3
Gate pulse for SCR3 with respect to pin 4 (see Section 6-3)
4
Reference for gate pulse to SCR3
5
Gate pulse for SCR2 with respect to pin 6 (see Section 6-3)
6
Reference for gate pulse to SCR2
7
Gate pulse for SCR4 with respect to pin 8 (see Section 6-3)
8
Reference for gate pulse to SCR4
RC54
1
Not used
2
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
3
0 volts with Output (Contactor) switch S3 in On position or +7.8 volts dc with S3 in Remote position
4
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
5
+10 volts dc output with Output (Contactor) switch S3 in On position
6
–24 volts dc
7
–24 volts dc with contactor on or off
8
0 to +10 volts dc input from min. to max. of Amperage Adjustment control R1 with contactor on
9
0 to +10 volts dc input from min. to max. of Amperage Adjustment control R1 with contactor on
10
Circuit common
11
+24 volts dc
12
0 volts during open-circuit voltage condition; +24 volts with arc on or contactor off