The DC-DC converter is optimized to connect on the frequency converter's dc bus/stage. This voltage is usually not filtered, has high EMI interference and leaves high leakage currents. The converter has a very robust input stage and filter, which provides safe operation even at very disturbing power supply. Duplicate 600V dc fuses are built-in, which saves space and money. At power outages, the motors act as generators and reset voltage to the frequency converter capacitors which, in turn, output voltage to the dc-dc converter. This means that 24V dc is maintained and a controlled stop can be performed.
The bonus effect gives 25% extra reserve with retained 24V which is an advantage when connected loads have high starting current.
The converter has polarity protection and minimal input current. In addition, there is a relay output (dc OK) that falls when the output voltage deviates more than 10% from the set value.
Powersupply 480-840VDC/24VDC 20A
|Input voltage DC||600 V|
|Input voltage dc min||480 V DC|
|Input voltage dc max||840 V DC|
|Inrush current||Typ. 1,6 A @ 600 V DC|
|Max entrance tripple||50 V pp|
|Type Power Supply||DC-DC|
|Start-Up Delay||350 ms|
|Output voltage||24 V DC|
|Output voltage min||24 V DC|
|Output voltage max||28 V DC|
|Output Current||20 A|
|Power Reduction Of 60 To 70 ° C||12 W/°C|
|Ripple. max||100 mV pp|
|Temperature Range Without Derating From||-25 °C|
|Temperature Range Without Derating To||60 °C|
|Life span||42000 h @ 24 V DC, 20 A, 40 °C|
|MTBF (IEC 61709)||446000 h @ 24 V DC, 20 A, 40 °C|
|Approvals||CE, CSA, EAC, UL|
|DC relay output||Yes|
|Keep time||Typ. 22 ms @ 600 V DC|
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