Commander SE Advanced User Guide 131
Issue Number: 4
Method 2
By taking one phase as one node and the screen and earth (if any) as the other node and measuring the capacitance
between these two points.
The same cable as used before would give a capacitance measurement of 130pF/m when using this method.
*This cable length is for 3kHz switching frequency. The cable length reduces in proportion to switching frequency; e.g. at
6kHz by a factor of 2 to 60m.
4.12 Storage and transportation
4.12.1 Storage
The drive can be safely stored in its “as delivered” state for up to 2 years provided the drive environment is within the limits
specified in the General Data section of the Commander SE User Guide.
Following a 2 year storage period the DC Bus electrolytic capacitors will need reforming. This is a simple operation requiring
a variable AC source (such as a Variac - single and three phase). Provided the DC electrolytic capacitors are reformed at the
end of each and every 2 year storage period, the drive can be stored indefinitely.
The reforming process is carried out as follows:
• Connect the drive as illustrated (single phase Variac and drive shown). No other control/power connections are
necessary.
• Suitably fuse the input to the Variac using slow-blow type fuses (e.g. 0.5A or similar) and a similar rated fuse to the input
of the drive.
• With the Variac set to 0VAC output, turn on the supply and gradually increase the voltage to the drive (e.g. 4.5VAC per
minute with a maximum of 5VAC steps). Over a period of time increase the voltage from 0VAC to 275VAC (525VAC -
400V product). At the end of the time period, with 275VAC (525VAC - 400V product), applied remove the drive from the
supply.
The reforming process is now complete and the drive can be stored for another 2 years.
Drive Size
Maximum motor cable length
mft
1 75 246
2 100 330
3 150 495
4 150 495
5 120* 394*
130pF
V~
Variac
Drive
Supply
200~240VAC
50/60Hz
L2
L1
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