YASKAWA CIMR-F7Z44P0 User Manual page 160

Check
The output transistors are used to switch the DC bus voltage to allow current to flow to the
motor.
1. Set a digital multi-meter to the Diode Check setting.
2. Place the positive (red) meter lead on terminal U/T1.
3. Place the positive (red) meter lead on terminal V/T2.
4. Place the positive (red) meter lead on terminal W/T3.
5. Place the positive (red) meter lead on terminal U/T1.
6. Place the positive (red) meter lead on terminal V/T2.
Output Transistors
7. Place the positive (red) meter lead on terminal W/T3.
(Q1-Q12)
8. Place the positive (red) meter lead on terminal (-).
9. Place the positive (red) meter lead on terminal (-).
10. Place the positive (red) meter lead on terminal (-).
11. Place the positive (red) meter lead on terminal ⊕ 1.
12. Place the positive (red) meter lead on terminal ⊕ 1.
13. Place the positive (red) meter lead on terminal ⊕1.
All Drives have a Control Power Fuse. The fuse is located on either the Power PCB (3PCB) or
the Gate Drive PCB (3PCB). The Control Power Fuse protects the primary switching mode
power supply.
Control Power Fuse
1. Set a digital multi-meter to the R x 1 scale.
2. Place one lead of the multi-meter on one side of the fuse and place the other lead of the
3. If the fuse is good, the measured value will be zero ohms.
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Table 6.6 Main Circuit Test Procedure
Place the negative (black) meter lead on terminal ⊕ 1.
Expected reading is about 0.5 Volts.
Place the negative (black) meter lead on terminal ⊕ 1.
Expected reading is about 0.5 Volts.
Place the negative (black) meter lead on terminal ⊕ 1.
Expected reading is about 0.5 Volts.
Place the negative (black) meter lead on terminal (-).
Expected reading is OL displayed.
Place the negative (black) meter lead on terminal (-).
Expected reading is OL displayed.
Place the negative (black) meter lead on terminal (-).
Expected reading is OL displayed.
Place the negative (black) meter lead on terminal U/T1.
Expected reading is about 0.5 Volts.
Place the negative (black) meter lead on terminal V/T2.
Expected reading is about 0.5 Volts.
Place the negative (black) meter lead on terminal W/T3.
Expected reading is about 0.5 Volts.
Place the negative (black) meter lead on terminal U/T1.
Expected reading is OL displayed.
Place the negative (black) meter lead on terminal V/T2.
Expected reading is OL displayed.
Place the negative (black) meter lead on terminal W/T3.
Expected reading is OL displayed.
multi-meter on the other side of the fuse.
If the fuse is bad, the measured value will be infinite ohms.
Diagnostic & Troubleshooting 6 - 23
Procedure