CDM Assembly T1689 Technical Manual Rev 07
Receipt & Storage of Equipment MV3000 Air Cooled DELTA
Page 112
DC Link Capacitors
• For a 35°C storage temperature, the shelf life is approximately 40,000 hours or 4.5 years.*
• For a 25°C storage temperature, the shelf life is approximately 80,000 hours or 9 years.*
* Data based on BHC Aluminium Electrolyte Capacitors – Long Life type.
Taking into account other components inside the drive we can approximate a guide shown below.
Approximate shelf life of an
inverter
The boundaries depend on
storage temperature.
5.2.4 Procedures after Removing DELTA Transistor Bridge Modules from Long Periods of Storage
5.2.4.1 For DELTA Transistor Bridge Modules Stored for up to Three Years
The DELTA Power Module can be powered up and used without further consideration for capacitor reforming.
Refer to the additional replacement instructions in Section 9.5.
5.2.4.2 For DELTA Transistor Bridge Modules Stored from Three to Five Years
Power up the DELTA Power Module and leave with the power applied for a period of 4 hours before attempting
to use. Refer to the additional replacement instructions in Section 9.5.
5.2.4.3 For DELTA Transistor Bridge Modules Stored in High Ambient Temperatures for Four Years or more
It is possible that the main DC Link Capacitors need to be reformed. This is a specialist task: return the DELTA
Power Module to the factory.
If this is not practicable:
a) Apply a current limited, variable voltage power supply to the DC Link (with the DELTA Power Module
isolated from the normal mains supply) and slowly raise the value from zero to the normal working
voltage of the DC Link.
During this period, limit the current to 5mA per capacitor (around 60mA for a parallel bank of 12).
This procedure involves the use of high voltages and should only be attempted by qualified and experienced
engineering personnel. This procedure can also result in damage to one or more of the DC Link Capacitors.
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