Tweco 51 with SL100SV CutMaster - Manual (Page 93)

Manual 0-4640 5-29 SERVICE
5
C. Diode Module Board Tests
WARNING
Disconnect primary power at the source before taking any resistance checks.
1. Input Diode Test
a. Disconnect input AC power.
b. Check Input Diode for shorted input diode. With an ohmmeter set on the diode range make the following checks from
Main PC Board to Input Diode:
For 400-Volt and 460-Volt Power Supplies:
Meter (+) Meter (-) Indication
E1 E11 Diode Drop
E11 E1 Open
E2 E11 Diode Drop
E11 E2 Open
E3 E11 Diode Drop
E11 E3 Open
E12 E1 Diode Drop
E1 E12 Open
E12 E2 Diode Drop
E2 E12 Open
E12 E3 Diode Drop
E3 E12 Open
For 208/230-Volt Power Supplies:
Meter (+) Meter (-) Indication
E2 E11 Diode Drop
E11 E2 Open
E12 E2 Diode Drop
E2 E12 Open
c. The meter should indicate a diode drop in one direction and an open in the other direction for each check. Replace the
Input Diode Module Board if the readings do not match the chart.
d. If Input Diode Module Board is shorted, make the following checks with an ohmmeter at the Main Contactor (W1):
Meter (+) Meter (-) Indication
L1 T1 Open
L2 T2 Open
400/460V
Only
L2 T1 Open
All
Voltages
If any test has resistance, then replace the Main Contactor.