Diagnostics & Troubleshooting 6 - 31
Drive Date Stamp Information
This information is used to determine when a Drive was built to see if it is within its warranty period. The date stamp is located
on the lower right side of the Drive.
Fig 6.1 Date Stamp Location
Table 6.6 Main Circuit Test Procedure (continued)
Check Procedure
24Vdc 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
Ω are measured, conclude that the fan motor is
shorted. If infinite
Ω are measured, conclude that the fan motor is burned open.
5. If the fan is not working, then disconnect the fan and apply 24Vdc to the fan to test the motor.
230/240Vac 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
Ω. If 0Ω 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 230/240Vac 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 230/240Vac 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
Ω. If the fuse is bad, the measured value will
be infinite
Ω.
PRD
INSP2
96 3. 31
YEA Production
Manufacture Date
Inspector Number
00.7.22
Email: Sales@aotewell.com
To Next Page
Loading...
Need help?
General