Rockwell Automation 150 USE MN/SMC DIALOG + CONTROLLER - Manual (Page 163)

10-14 Troubleshooting
Power Module and Interface
Board Resistance Check (cont.) 2. Measure resistance between:
• pins J14 and J15 for phase L1/T1
• pins J9 and J10 for phase L2/T2
• pins J1 and J2 for phase L3/T3
The resistance should be approximately 100
Ω
.
If any of the resistances measure greater than 100
Ω
, recheck the
resistance values directly at the gate lead connectors as shown in
Figure 10.9.
Based on the results, one of the following actions will be required:
1. All resistance values are valid - Replace interface board.
2. Resistance(s) measure greater than 100
Ω
– Replace correspond-
ing power pole(s).
Thermistor Resistance
1. Measure resistance between:
• pins J6 and J24 for phase L1/T1
• pins J8 and J23 for phase L2/T2
• pins J7 and J22 for phase L3/T3
The resistance should be less than 500
Ω
.
If any of the resistances measure greater than 500
Ω
, recheck the
resistance values directly at the thermistor lead connectors as shown
in Figure 10.9.
Based on the results, one of the following actions will be required:
• If all resistance values are valid, replace interface board.
• If resistance(s) measure greater than 500
Ω
, replace the
corresponding power pole(s).
Figure 10.9 Gate and Thermistor Lead Identification (180–1000A)
Gate lead,
phase L2-T2
Gate lead,
phase L1-T1 Gate lead,
phase L3-T3
Gate lead,
phase L3-T3
Gate lead,
phase L2-T2
Gate lead,
phase L1-T1
Thermistor lead,
phase L1-T1
Thermistor lead,
phase L3-T3
Thermistor lead,
phase L2-T2