switching relays with 48VAC coils?

Although the majority of the relays in my machine can be deleted, I'd like to keep the following 4 contactors.

DC motor controller; fused 35A, rapid
Positioning Servos PS, fused 16A, rapid
Coolant pump, breaker 0,63A
Lubrication pump, breaker 0,63A (single phase).

It had been my intention to drive these contactors with the MOSFET output section of the 7i37 board.

Unfortunately these devices are 48VAC type.

Is there a simple off-the-shelf buffer that can be inserted between these 48VAC devices and the 7i37 or 7i47?

Maybe the simplest solution is to source some DC signal relays that would plug into the existing comat cs11 sockets???

Source DC switched contactors???



Would like to learn from the experience of others.

Rgds
_jC
.

A fairly simple thing would be to use a OPTO22 rack. The 24 I/O rack will connect directly to a 5I20/22/23 I/O connector
and give you 24 AC or DC input or outputs depending on the modules installed. The OAC5 module for example is 24-240VAC 5A

The racks and modules show up regularly on Ebay

PCW wrote:

... a OPTO22 rack. The 24 I/O rack will connect directly to a 5I20/22/23 I/O connector and ...

Interesting. Especially good to know for next time.

In this instance I am thinking to replace/upgrade the existing required contactors with DC controlled units, and maintain my original plan of using the 7i37 as the primary control level interface.

To this end I have found the following Schneider/TelSys (ex Telematique) reference an especially useful guide for a noob like me.

The essential guide of Control Panel <-- Nice terse index to the TelSys full line catalog.

Thx and rgds
_jC
.

Contactors are 'spensive!

VISHAY VO14642AT - SSR, MOSFET, 60V, 2A are cheap!

Looks like they will drive the existing 48VAC logic.

60V is a little low... (48VAC is 67V peak)

PCW wrote:

60V is a little low... (48VAC is 67V peak)

I had that feeling in by belly, but I don't have the experience to know if the specs are RMS or nominal AC volts.

There is also the IEC 380V vs 400V thing, so the actual voltage may be higher since the trafo is a 380V primary and the wall voltage is higher. I haven't measured across the solenoid 'cause I am waiting on (official) approval of 32A service (and inspections) in my shop.

There is a big gap between the Vishay lh1510 and vo1462. Does some other supplier fill that gap?

I need to look up the Telematique solenoid current draw.

Thanks again!

_jC
.

CEL has some with 2A to 80V and 350 ma at 120V

www.cel.com/product.do?command=viewOverv...&group=2&level2=2203

But if you just need to drive one 48V contactor I would just use a standard screw terminal SSR