Question:
Which current load is to be estimated for dimensioning an external24V supply with regard to the control electronics of a 9300 drive controller?
Answer:
According to the 9300 Operating Instructions a current requirement of 1A is mentioned for dimensioning the external 24V supply. This value refers to the most unfavourable case (worst case) if all possible components are connected together at the same time and must be supplied:
- Control electronics: 390 mA
- Digital outputs: 210 mA
- Resolver: 70 mA
- Encoder: 60 mA
- Digital frequency input: 50 mA
- Digital frequency output: 20 mA
- AIF clip-on module: 200 mA
- -------------------------------------------
- Total: 1000 mA
In practice not all components and inferfaces mentioned before are connected. This means that it can be assumed that the current requirement for e.g. a drive with resolver feedback and some digital I/Os amounts to 1/2A.
If an AIF communication module is used the value increases by 0.2 A.
All current values refer to 24V DC-voltage. In the end, a certain supply performance is required so that a lower DC-voltage results in a larger current requirement and vice versa, a smaller current requirement leads to a higher DC-voltage.
Tip:
With standard operation the control electronics of the 9300 drive controller is supplied by the integrated switched-mode power supply unit. The external 24V voltage source which may be connected externally via terminal X5/59 (+24V external) is connected in parallel (decoupled via diodes).
Therefore, the external 24V supply is only loaded if:
- the mains supply of the drive controller is switched off or
- the mains supply is switched on and the actual voltage of the 24V external voltage sources exceeds approx. 27V.
Search terms: current load, 24V supply, DC supply, current requirement, power requirement
