14 PACMotion VFD AC Variable Speed Drive User Guide GFK-3111A
Installation Following a Period of Storage
Where the drive has been stored for some time prior to installation, or has remained without the main power
supply present for an extended period of time, it is necessary to reform the DC capacitors within the drive
according to the following table before operation. For drives which have not been connected to the main
power supply for a period of more than 2 years, this requires a reduced mains voltage mains voltage to be
applied for a time period, and gradually increased prior to operating the drive. The voltage levels relative to
the drive rated voltage, and the time periods for which they must be applied are shown in the following table.
Following completion of the procedure, the drive may be operated as normal.
Figure 6: Installation Following a Period of Storage
100%
75%
50%
25%
T1 T2 T3 T4
Table 7: Installation Following a Period of Storage
Storage Period
/
Power-OFF
Period
Initial Input
Voltage
Level
Time
Period T1
Secondary
Input
Voltage Level
Time
Period T2
Third Input
Voltage
Level
Time
Period T3
Final Input
Voltage
Level
Time
Period T4
Up to 1 Year 100% N/A
1 – 2 Years 100% 1 Hour N/A
2 – 3 Years 25% 30 Minutes 50% 30 Minutes 75% 30 Minutes 100% 30 Minutes
More than 3
Years
25% 2 Hours 50% 2 Hours 75% 2 Hours 100% 2 Hours
Time Period
Percentage of Input Voltage Level
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