MTZ I/O Modules

[Peter_Hall]

We are looking at a specification where a manufacturer is using a combination of metering with its own RS485 and G99 protection relay that has ACB status and Voltage limits via I/O’s pushed to a BMS system via the G99 relay RS485. We have been asked to quote and we are looking at offering a simplified solution using SE devices.

We can cover the metering and ACB position via an MTZ ACB with an RS485 output. Can we connect an I/O unit to the MTZ and input G99 relay and Voltage within limits I/O’s into the I/O unit and name them for output via the RS485?
The current arrangement seems to be a messy solution with multiple RS485 outputs. The above solution would tidy the offer up.

[Fabien_Mastrot]

Hello Peter,

we are on, to answer asap to your question related to MTZ, I/O and G99 relay of ComAp.

To avoid misunderstanding on your question, do you a have draft drawings of what you want to do ? 

Thanks

Fabien

[Peter_Hall]

Hi Fabien,

Thanks for responding.

We don't have any details on this such as a wiring diagram, only an outline requirement from our customer.

We have the following arrangement:

MTZ ACB connected to IFM with to an RS485 connection to out customers BMS. MTZ ACB to give via RS485:

Metering information.

Device position information (Open/Closed).

The MTZ ACB is operated by a G99 relay (Loss of mains). Our customer would like to monitor this. Admittedly we could wire I/O from the G99 relay (spare relay), but would it be possible to wire to an input on an MTZ I/O module then send this (and a couple of other relay inputs from other devices) position information via the RS485 output from the MTZ ACB?

Can we also within the MTZ set limits on such things as Voltage (High/Low) and Current (high) and send these alarms via the RS485?

I'm trying to get away from the current solution that we are seeing in the industry of multi RS485 connections and lots of Volt free outputs from the likes of G99 relays, Over/Under Voltage relays. It would be a nice clean solution if we could simply give the customer a single RS485 output.

[Ludovic_Soudril · Accepted solution]

Dear Peter,

You will find my comment in Bold below:

We don't have any details on this such as a wiring diagram, only an outline requirement from our customer.

We have the following arrangement:

MTZ ACB connected to IFM with to an RS485 connection to out customers BMS. MTZ ACB to give via RS485:

Metering information.

Device position information (Open/Closed).

The MTZ ACB is operated by a G99 relay (Loss of mains). Our customer would like to monitor this. Admittedly we could wire I/O from the G99 relay (spare relay), but would it be possible to wire to an input on an MTZ I/O module then send this (and a couple of other relay inputs from other devices) position information via the RS485 output from the MTZ ACB?

Yes, it is possible to use the 6 digital inputs of IO module as user-defined inputs.

See IO user guide extract below:

For more details, please consult:

https://download.schneider-electric.com/files?p_Doc_Ref=DOCA0055EN

The IO module must be set in Application 9 with the rotary switch on the face of the IO module and configuration must be done by Ecostructure Power Commissioning.

If the input is activated, an alarm will be generated and this alarm is available through Modbus communication (RS485 or Ethernet).

You can read the status of the input as well through Modbus register.

For more details, please consult:

https://download.schneider-electric.com/files?p_Doc_Ref=DOCA0105EN

Can we also within the MTZ set limits on such things as Voltage (High/Low) and Current (high) and send these alarms via the RS485?

For current, I do not see solution to set current alarm within MTZ which could be available on communication.

For voltage, we have a Digital Module (ANSI 27/59 - Under/Over voltage protection) which can be installed on MTZ micrologic X and this DM can be used to trig either trip or alarm on undervoltage or overvoltage conditions.

See Under/Over voltage protection DM document attached.

I have still to verify if those alarms are available on communication or not.

As alternate solution, would it be possible that G99 relays activate outputs on current/voltage conditions?

Those outputs could be linked to IO module as well.

I'm trying to get away from the current solution that we are seeing in the industry of multi RS485 connections and lots of Volt free outputs from the likes of G99 relays, Over/Under Voltage relays. It would be a nice clean solution if we could simply give the customer a single RS485 output.

Best regards

Ludovic

[AlexandreBoulet]

@Anonymous user  or @RHH have you used this kind of communication set-up in the panels you build? Your experience would be highly appreciated!

[Peter_Hall]

Hi @Ludovic_Soudril ,

Thank you for your reply. It seems that we were not too far from the mark.

It is interesting to see what can be achieved with the MTZ ACB and its communication. We are interested in utilising this more as connectivity gains more traction.

Obviously the MTZ catalogue cannot go into depth about downloadable protection modules, communications and operating the devices via the communication system be it RS485 or TCP/IP. Maybe SE could produce a webinar/deep dive on this subject?

Best regards,

Peter Hall. 

[Fabien_Mastrot]

Hello Peter,

excellent idea. Thanks for your comment.

We will get back to the Offer Manager to work on a Webinar about it. 

[RHH]

The most common usage for measuring with an MTZ or any ACB in our experience is external by transformers etc. However the usages of an MTZ are wide and big. You can get info from the masterpact directly as you would with an kWh if you have the right components selected.

RS485 is a common output, also known as MODBUS. You most certainly can make use of it. Even if the external devices are different but still communicate with RS485. I think it would be less messy if you can collect all the data outputs (RS485 connections) and get them to one unit.

I would try to get an integration going with Schneider solutions of like home/spacelynk;

https://www.se.com/ww/en/product-range-presentation/62958-spacelynk/?selected-node-id=12146322253#ta...

Spacelynk can ''Interoperable with different system'' and thus read in external RS485 measurements etc.
You can then even make an more insightful user management/monitor for your client.

Here is a link that might be of help as well;

https://www.productinfo.schneider-electric.com/mtzmodbuscommguide/mtz-modbus-comm-guide/EN/BM_NOVA%2...