314 Rockwell Automation Publication 7000L-UM301F-EN-P - March 2020
Chapter 5 Component Definition and Maintenance
TB3-3 – Common connection of positive 15V power supply used for test power
TB4-2 – Cathode connection to SCR being controlled
TB4-1 – Gate connection to SCR being controlled
OP1 – Blue fiber optic cable receptacle – Firing pulse command from the
processor
OT1 – Grey fiber optic cable receptacle – Diagnostic status of the SCR
Testing procedure for SCR
self-powered gate driver
board
Equipment needed:
• Digital oscilloscope
• Function generator w/duty cycle control
• DC power supply (+15V @ 300 mA required)
• Digital multimeter
• Temperature sensor board (80190-639-02)
Procedure:
1. Connect a clamped ABB #5STP03D6500 SCR to the gate-cathode leads
of the SPGDB board (TB4-1/TB4-2).
2. Attach a temperature sensor board to the TB2-1/TB2-2 terminals.
3. Apply +15V test power to terminals TB3-1 and TB3-3 (TB3-1 is at +15V
while TB3-3 is the +15V return). Leave TB3-2 open.
4. Measure TP4 to TP3, which should be +14.4V, ±100mV.
5. Measure TP5 to TP3, which should be +5.0V, ±250mV.
6. Measure TB2-1 to TB2-2, which should be +14.4V, ±100mV.
7. Measure the voltage at U4-pin2 to COM, which should be +1.0V,
±100mV.
8. Measure the voltage at U4-pin3 to COM, which should be 0V.
9. Measure the voltage at U4-pin7 to COM, which should be +3.6V,
±100mV.
10. Verify that the OT1 LED is off.
11. Measure TP7 to TP3, which should be 0V.
12. Measure TP9 to TP3, which should be +5.0V, ± 250mV.
13. Measure TP8 to TP3, which should be 0V.
14. Measure TP1 to TP2, which should be 0V.
15. Connect a jumper between TB3-1 and TB3-2 and verify that the voltage
at TP6 is +2.2V, ±100mV.
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