Blind Control

What if any are the operational difference between the 4Ch Change over relay unit and the 1CH Motorised Blind/Curtain/Shutter Relay.

I need many blind control Channels and would prefer to use the 4Ch C/O module.

OR

Can I also consider 12CH relay modules with interposing C/O relays instead.

Does it have anything to do with break before make or any other operational differences?


Thank you
Tyrone

 

There are many. The main difference is that the 4-Channel Change Over relay unit functions just like a conventional relay unit, except that it has change over relay contacts having both a Normally Open and Normally Closed set of contacts. The Shutter Relay is specifically designed for controlling blind motors directly, either AC or DC. The Shutter Relay has mechanical interlocking between the up and down outputs and breaks the Neutral connection when the relay motor is stopped. It also has a configurable change-over delay, which is a period of time where the relay output is completely disconnected in between changes of direction. Without this delay, the back-EMF from the curtain motor can damage the relay contacts, eventually resulting in relay failure.

Not quite sure how you were thinking this could be done, or what benefits it would bring. The lack of a stop-off position between direction changes would mean using at least 2 relay channels per blind and writing lots of logic code to make it all hang together, which many forum users have discussed and done prior to the availability of the Shutter Relay.

The relays in the 12-Channel Relay unit cannot be replaced with change-over relays. The 12-Ch unit only has 2 terminals per channel and the change-over relay from the 4-Ch CO relay unit is mechanically different.

I assume you want to do this because it will be a teensy weensy bit cheaper than using 4 x Shutter Relay units? In reality, you'll need to use 2 relay channels to use standard relay units actually making this approach more expensive.

Sure does.

The Shutter Relay also has a time-out such that the relay outputs are automatically disabled after a configurable time.

I suggest you save yourself time, pain and money and use the Shutter Relay.

 

I didn't have a circuit for it but now I understand that the shutter relay incorporates two relays one to isolate and the other for change in direction.

You are right to do the same thing I would need 2Ch per blind.

Thanks Newman

Regards
Tyrone

 

or if you are operating all blinds in the same direction all the time (i.e all up or all down), what i have done in the past is used 1 ch to drive slave relays, relay on for up, relay off for down, then 1 ch per each blind for start / stop...