High altitude limitations for Indradrive Power System

[LuisCtrL]

Hello colleagues,

A customer wants to sell a machine with the Indradrive System above 2000 m.
What are the limitations ?

I am checking the manuals and I found there should be voltage limiters for the 24 V voltage (a 30 V overvoltage limiter is needed).

Also we found that there has to be a limiter between the outer-conductor transient voltages , and the outer-conductor to ground transient voltage.

What does it mean by the outer conductor? Are they the shield of the power cables feeding the indradrive system?  

Are there any more points the customer has to care about when designing the electrical connections of the machine for this altitude ? Thanks 🙂

Attached the information I could find on the manuals:

[macmotor · Accepted solution]

Could it be that you use outdated manuals?

Please refer to Project Planning manual R911318790, edition 06
https://www.boschrexroth.com/media/0d277bb3-d4a6-42c9-9f5d-7551dc41c2eb

and/or Drive System manual R911309636, edition 07
https://www.boschrexroth.com/media/025b9cc8-a587-4c23-b169-d6b18975117d

These provide up-to-date information and also notes on auxiliary IndraDrive components or the necessity of an isolating transformer. Transient voltages should not be the issue here.

But altitude restrictions and possible deratings simultaneously apply also to the motors (e.g. derating on continuous power) and cables (probably derating on ampacity).

First task for the OEM is to specify the operating and ambient conditions for the site of operation and then go through sizing & selection with the product specs given in our manuals.