Are there really different axels for DC and AC

Are there really different axels for DC and AC

Postby Rich1853 » Tue Jun 12, 2018 4:27 pm

I was on the HERIS web site and was reading their FAQs and under TECHINAL II there was this:

1. Wheelsets for DC and AC
Heris models are shipped with DC axes. An exchange when used in AC operation is mandatory because of the low flange.
By common exchange wheelsets or those of Heris, which are provided free of charge for specialist dealers for exchange, the models are easy to convert. Please note that an exchange with Heris or the spare parts service incurs costs.

me:
what is the difference, is there a shorting problem that I never heard of before being a nobie.
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Re: Are there really different axels for DC and AC

Postby sacto-tt » Wed Jun 13, 2018 1:00 am

In most AC systems, the rails are common (i.e. connected together) electrically, so the axles are not insulated from the wheels. If you look at Marklin AC track or .027 track, you'll see that there is a center rail/nub that is the other side of the circuit. Using AC wheelsets will short a DC system since each rail is of opposite polarity.
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Re: Are there really different axels for DC and AC

Postby krokodil » Wed Jun 13, 2018 1:01 am

There are (can be) several differences. The flanges and the wheel geometry are different. Depends on the wheel manufacturers the wheels can be electrically insulated or not (for AC). In the original AC standards no isolation is required. Several DC vehicles use the frame sides for the power pic-up, in such vehicles the axles in the middle are cut ie the both wheels are connected to two half axles and assembled into a single wheelset. If you have lighting in the car it will not work with a new non isolated AC axles. For AC vehicles you need extra pic-ups for ligthing and probably internal rewiring.
On freight cars you have less problems with replacement.
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