RH35M rotation

We have numerous RH35M-4EK.4F.1R fans used for cooling on Allen-Bradley drives. The motors have 4 leads coming out for terminations and operate on 220V 1~. I cannot find a corresponding wiring diagram in your site documentation as we have one less wire than your documentation indicates.

We recently experienced a drive overheating issue due to the rotation being incorrect after replacing a fan/motor assembly.
All motors have the following leads:
Black (marked Z2)
Blue (marked U2)
Brown (marked TK)
Yellow-Green (ground termination)

When tested in shop with a second spare fan, we found that when both motors are wired identically the good spare operates at full speed in the correct rotation, and the unit that caused the overheating was operating at full speed in the reverse direction.
Can the rotation of these motors be changed by external wirng? We are uncertain as to why one unit is operating in the reverse direction. We believe it was in service at one time and removed either to replace bearings or rewind. Can you provide wiring information for these motors? We believe we have sorted out wiring details with shop test, but your info
would help confirm.

I can provide other nameplate details if required.

Richard

Dear Richard,

can you provide us the part-no. of this fan, please?
This is a number which has 6 digits and is printed on the rating plate.

Best regards

Ziehl-Abegg AG

Michael Dietrich

I believe this would be 203494
another number (maybe serial #) is
V122797 on the one which is reversed and
V122647 which is correct.

Richard

Hi Richard,

thanks for the additional data.
Can you please send me your contact data or would you please fill in your eMail-address in your profile. Then we will come back to you for a solution.

Best regards

Ziehl-Abegg AG

Michael Dietrich

I have updated my profile info.