Hi Max it's controlling the ac input line into a rectifier. then the rectifier feeds the motor. it's the main treadmill motor, rated 220vdc 10a c142d34oz3a. This treadmill doesn't have a raise/lower motor, although it had a sister model that did that might have shared the same power board? I'm getting no ac input to the rectifier and there's not much before it to have failed and the relay is acting a bit strangely when tested.What motor is it controlling? Never seen a relay involved in the belt motor, most likely is the track raise/lower motor.
Determine the motor and see what the rating on the plate is.
Max.
Due to the physical nature of Direct Current and Alternating Current the same physical contact must be rated differently. I'll just leave it at that without going into theory but has a lot to do with arc suppression when opening the contact under load. Since the relay can be used to switch either DC or AC they give the ratings for each. What does not change is the coil DC rating V. I didn't go into the coil current rating but it typically is around 2A for that type of relay which is pretty standard and more than enough under normal usage. Typically only uses a couple hundred mA or so. Max knows a good bit about treadmills and their motors so he can help you there.how can it be both 20A at 30VDC and 16A at 30VDC at the same time
Brilliant. Thanks Max. I will look into the theory. Thanks for the help and advice!Due to the physical nature of Direct Current and Alternating Current the same physical contact must be rated differently. I'll just leave it at that without going into theory but has a lot to do with arc suppression when opening the contact under load. Since the relay can be used to switch either DC or AC they give the ratings for each. What does not change is the coil DC rating V. I didn't go into the coil current rating but it typically is around 2A for that type of relay which is pretty standard and more than enough under normal usage. Typically only uses a couple hundred mA or so. Max knows a good bit about treadmills and their motors so he can help you there.
Thanks Max. The treadmill is a million years old (Tunturi J3F) so I expect they do things differently now. I'm afraid I don't understand your dry switching comment - I think it's a normally open relay. When the treadmill kicks in after a countdown, the relay can be heard switching. Except it was behaving very suspiciously. I replaced the relay today and the treadmill works! Thanks for your help with this. Can I ask one more favour? I replaced it with RM85-5021-25-1012 SPST-NO https://www.tme.eu/en/details/rm85-5021-25-1012/miniature-electromagnetic-relays/relpol/ I think this is actually a 16A rated relay and that I possibly need 20A? Is that correct? If so I'll order the original or your recommended replacement from China and just be patient.In my opinion, switching a load such as a TM DC belt motor is pushing it for a relay such as this. The ones I am familiar with do not use a relay in the belt motor circuit.
I suspect in that application that normally the relay contacts would be switched dry, IOW open and close when no load is present.
When looking for a quicker replacement, as all ready suggested, look through some of the relay suppliers catalogues for one with the same footprint and order from Mouser, Digikey etc.or your usual UK suppliers.
You need a 230VAC switching rating for the contacts, at least 10a rating.
Max..
by Aaron Carman
by Aaron Carman
by Duane Benson