Reforming the capacitors 13
Reforming with external diode bridge
This method can be used for capacitor reforming if the converter has been stocked (non-
operational) for two years or longer (product series ACS800, ACS850, ACQ810, ACSM1,
ACS880-104, ACS380, ACH480 and ACS480) or for t
hree years or longer (product series
ACH580, ACQ580, ACS580 and ACS880 except ACS880-104).
WARNING! Obey the safety instructions in section Safety instructions on page 6.
If you ignore them, injury or death, or damage to the equipment can occur. Never
switch on the converter power supply while the reforming circuit is connected.
Lock the disconnector (if any) to an open position.
1. Make sure that the converter module is disconnected from all possible power sources
(all AC and DC inputs/outputs are disconnected).
2. Measure that the installation is de-energized:
• Use a multimeter with an impedance of at least 1 Mohm.
• Make sure that the voltage between the converter input power terminals (U1, V1
and W1) and the grounding terminal (PE) is close to 0 V.
•
Make sure that the voltage between the converter DC terminals (UDC+ and UDC-
)
and the grounding terminal (PE) is close to 0 V.
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