MA-041 – DGA 900 Plus - Installation & Commissioning Manual - Rev 1.1 4-Mar-22 Page 79 of 99
4. Use the product’s HMI, select Models > OLTC Motor Torque to verify the
parameter values.
In the OLTC Motor Torque page, ensure that all the parameters display a value (i.e.
are not offline). If the parameters read ‘Offline’, return to Step 1.
5. Increase the tap changer position by one. Is this the highest position? If Yes, then
go to Step 9. If No, then go to Step 6.
6. Increase the tap changer position by one. Is this the highest position? If Yes, then
go to Step 9. If No, then go to Step 7.
7. Decrease the tap changer position by one.
8. Increase the tap changer position by one. Is this the highest position? If Yes, then
go to Step 9. If No, then go to Step 6.
9. Decrease the tap changer position by one.
10. Increase the tap changer position by one.
11. Decrease the tap changer position by one. Is this the lowest position? If Yes, then
the tap position sequence is complete. If No, then go to Step 11 (i.e. repeat this
step until the tap changer is at its lowest position).
Figure 10-10 illustrates an example of tap position movements following this sequence
of steps.
Note: The actual number of positions depends on the type of tap changer.
Figure 10-10: Tap position movements — an example
10.3.3 Download DGA 900 Plus data to Perception
The new OLTC data must be downloaded from the DGA 900 Plus. The recommended
means to do this is via the Perception Desktop software.
1. Start the Perception Desktop software on a computer.
2. Select File > New Database.
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