Yaskawa iQpump Controller User Manual - Manual (Page 157)

6.8 Main Circuit Test Procedure
YASKAWA TM.iQp.06 iQpump Controller User Manual 157
Output Transistors
(Q1-Q12)
(Continued)
11. Place the positive (red) meter lead on terminal ⊕ 1.
Place the negative (black) meter lead on terminal U/T1.
Expected reading is OL displayed.
12. Place the positive (red) meter lead on terminal ⊕ 1.
Place the negative (black) meter lead on terminal V/T2.
Expected reading is OL displayed.
13. Place the positive (red) meter lead on terminal ⊕1.
Place the negative (black) meter lead on terminal W/T3.
Expected reading is OL displayed.
Control Power Fuse
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.
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 multi-meter on the
other side of the fuse.
3. If the fuse is good, the measured value will be 0 ohms.
If the fuse is bad, the measured value will be infinite ohms.
24 Vdc Cooling Fans
(Heat Sink & Internal)
The Heat Sink & Internal Cooling Fans cool the heat sink as well as the output transistor modules of the drive.
1. Conduct a visual inspection to ensure the fan turns freely.
2. If there is no physical evidence that the fan is bad, the fan motor can be checked with a digital multi-meter.
3. Set the digital multi-meter to the R x 1 scale.
4. Measure across the fan motor terminals. If 0 ohms are measured, conclude that the fan motor is shorted. If
infinite ohms are measured, conclude that the fan motor is burned open.
5. If the fan is not working, then disconnect the fan and apply 24 Vdc to the fan to test the motor.
230 / 240 Vac Cooling Fans
(Heat Sink)
The Heat Sink Cooling Fans cool the heat sink to remove heat from the drive.
1. Conduct a visual inspection to ensure the fan turns freely.
2. If there is no physical evidence that the fan is bad, the motor can be checked with a digital multi-meter.
3. Set a digital multi-meter to the R x 1 scale.
4. Measure across the fan motor terminals. If the fan motor is good, the measured value should be about 500
ohms. If 0 ohms are measured, conclude that the fan motor is shorted. If infinite ohms are measured,
conclude that the fan motor is burned open.
5. If the fan is not working, then disconnect the fan and apply 230 / 240 Vac to the fan to test the motor.
Cooling Fan Fuse
Large drive units contain a Cooling Fan Fuse. It is located on either the Gate Drive Board (3PCB) or the Tap
Change Board (8PCB). If the Cooling Fan Fuse is open, then the 230 / 240 Vac cooling fans may be defective.
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 multi-meter on the
other side of the fuse.
3. If the fuse is good, the measured value will be 0 ohms.
If the fuse is bad, the measured value will be infinite ohms.
Check Procedure