Allen-Bradley The PowerFlex 755 On-Machine - Bus Capacitor Reforming Guidelines; Receptacles and Cable Connectors

200 Rockwell Automation Publication 750-UM006C-EN-P - March 2022
Chapter 7 Periodic and Preventive Maintenance
Bus — For drives that are in storage and do not have a voltage that is applied,
maintenance of the drive product can also be required
(see Figure 13
). For drives that are stored under 2 years, there is no additional
maintenance required. For storage greater than 2 years, see Tab l e 9
for bus
capacitor reforming requirements.
Figure 13 - Bus Capacitor Reforming Guidelines
Receptacles and Cable Connectors— Check the tightness of all external
cable connections that are made to the quick connectors on the bottom
Table 9 - Drive Storage Duration and Reforming Recommendations
Duration Reforming Guideline
Under 2 years No reforming required.
2 …3 years Apply rated voltage, per the normal method, for 30 minutes under no load.
Over 3 years Using a DC power supply connected directly to the DC terminals of the product, ramp-up the volt-
age from 0…100% of DC bus voltage (as per Tab le 1 0 DC Bus Voltage Ramp-up Values) in incre-
ments of 50%, 75%, and 100% rated voltage, under no load, for 30 minutes at each increment.
See Figure 13
for an illustration of this method.
Table 10 - DC Bus Voltage Ramp-up Values
AC Input Voltage Voltage Across the DC Bus
400/480V 680V DC
Storage period < 2 years = No reforming required
Storage period 2…3 years
Storage period >3 years
100
90
80
70
60
50
40
30
20
10
0
0
15
30
45
60
75
90
Time [min]
% of Voltage [V]